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10Pcs DC Plug Male Electrical Socket Outlet DC-022 DC-005 DC-022B DC Outlet 5.5X2.1MM 5.5*2.1

 
MAX4466
 
Description: Add an ear to your project with this well-designed electret microphone amplifier. This fully assembled and tested board comes with a 20-20KHz electret microphone soldered on. For the amplification, we use the Maxim MAX4466, an op-amp specifically designed for this delicate task!
The amplifier has excellent power supply noise rejection, so this amplifier sounds really good and isn't nearly as noisy or scratchy as other mic amp breakouts we've tried!
This breakout is best used for projects such as voice changers, o recordingmpling, and o-reactive projects that use FFT. On the back, we include a small trimmer pot to adjust the gain. You can set the gain from 25x to 125x.
That's down to be about 200mVpp (for normal speaking volume about 6 inch away) which is good for attaching to something that expects'line level'input without clipping, or up to about 1Vpp, perfect for reading from a microcontroller ADC. The output is rail-to-rail so if the sounds gets loud, the output can go up to 5Vpp!
Using it is simple:
Connect GND to ground, VCC to 2.4-5VDC.
For the best performance, use the "quietest" supply available (on an for Arduino, this would be the 3.3V supply).
The o waveform will come out of the OUT pin. The output will have a DC bias of VCC/2 so when its
perfectly quiet, the voltage will be a steady VCC/2 volts (it is DC coupled). If the o equipment you're using requires AC coupled o, place a 100uF capacitor between the output pin and the input of your device. If you're connecting to an o amplifier that has differential inputs or includes decoupling capacitors, the 100uF cap is not required.
The output pin is not designed to drive speakers or anything but the smallest in-ear headphones- you'll need an o amplifier (such as 3.7W stereo amp) if you want to connect the amp directly to speakers. If you're connecting to a microcontroller pin, you don't need an amplifier or decoupling capacitor - connect the OUT pin directly to the microcontroller ADC pin.
For o-reactive projects, we suggest using an FFT driver library which can take the o input and'translate'it into frequencies.
Condition: New
Type: Other
Color: purple
Material: PC Metal

The power supply is a kind of high-efficiency voltage automatically regulator.
Whatever is the input voltage value,the output voltage can be maintained constant.
For example,set the output to 12V, then the variation of the input voltage in the range of 5-32V,
the output voltage in the 12V invariant.
This module has a perfect protection function, and can be widely used in notebook power,
vehicle power supply, solar charge etc..
Advantages:
The input uses replaceable fuse to protect power supply and equipment;
The whole electrolysis use patch, low resistance, high frequency capacitor
,to make the ripple down to the freezing point;
Constant voltage, constant current, under voltage protection (MPPT is more suitable for solar charging)
The output has error indicating lamp,it will light when the output voltage drift too serious,
short circuit and other fault;
Inductor use iron silicon aluminum, 0.8 double winding, generate less heat.
Parameters:
Input voltage: DC5-32V;
Output voltage: DC1V-30V continuously adjustable; the default 12V shipment
Output current: 10A (MAX) ,long term within 8A
Output power: 80W, peak 130W, more than 80W please strengthen heat dissipation
Output ripple: 50mV (12V turn to 12V, 5A measured)
Short circuit protection:YES
Input reverse connection protection: No
Output prevent reverse connection protection: No
Operating temperature range: -45 ~ 85 centigrade

 
 
 
    Package Included:
. 1 x Small passive buzzer module KY-006
.1 x 2-color LED module KY-011
.1 x Hit sensor module KY-031
.1 x Vibration switch module KY-002
.1 x Photo resistor module KY-018
.1 x Key switch module KY-004
.1 x Tilt switch module KY-020
.1 x 3-color full-color LED SMD modules KY-009
.1 x Infrared emission sensor module KY-005
.1 x 3-color LED module KY-016
.1 x Mercury open optical module KY-017
.1 x Yin Yi 2-color LED module 3MM KY-029
.1 x Active buzzer module KY-012
.1 x Temperature sensor module KY-013
.1 x Automatic flashing colorful LED module KY-034
.1 x Mini magnetic reed modules KY-021
.1 x Hall magnetic sensor module KY-003
.1 x Infrared sensor receiver module KY-022
.1 x Class Bihor magnetic sensor KY-035
.1 x Magic light cup module KY-027
.1 x Rotary encoder module KY-040
.1 x Optical broken module KY-010
.1 x Detect the heartbeat module KY-039
.1 x Reed module KY-025
.1 x Obstacle avoidance sensor module KY-032
.1 x Hunt sensor module KY-033
.1 x Microphone sound sensor module KY-038
.1 x Laser sensor module KY-008
.1 x 5V relay module KY-019
.1 x Temperature sensor module KY-001
.1 x Temperature sensor module KY-028
.1 x Linear magnetic Hall sensors KY-024
.1 x Flame sensor module KY-026
.1 x Sensitive microphone sensor module KY-037
.1 x Temperature and humidity sensor module KY-015
.1 x XY-axis joystick module KY-023
.1 x Metal touch sensor module KY-036
.1 x Box

This is a small vibration motor suitable as a non-audible indicator. When the input is high, the motor vibrates, just like your silent mode phone.
Feature:
- Rated voltage: 5.0VDC
- Operating voltage: 3.0 - 5.3VDC
- Rated speed: 9000 rpm minimum
- Rated current: up to 60 mA
- Starting current: up to 90 mA
- Starting voltage: DC3.7V
- Insulation resistance: 10Mohm
- Compatibility: Compatible with UNO R3/ Mega2560
- Great for DIY projects
                                                                                                                                                                                                   
 
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We also sell many kind of electronic products.
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For all customer orders, we do not charge handing fee, even 1pcs part.
When parts arrived at your local custom, if the parts were charged customs duty, we do not responsible for any custom duty or import tax
 
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·We will ship out your items within 1-5 business days after the payment is cleared.
 
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If you have any question, please contact us via Trademanager.
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We are closed weekends, so if you email us on Friday, we may not get back to you until next Monday.

Product parameters:
 
Product size: 45 * 28mm
Operating voltage: DC5V
Communication: WIFI (ESP8266 module)
Serial communication parameters: 9600,8,1,0,0
Transmission distance: the maximum transmission distance of 400m (open environment, mobile phone equipped with WIFI module)
Load: 10A/250VAC 10A/30VDC, the relay pull 100,000 times
 
 
Way of working:
 
Mobile phone equipped with WiFi module;
Mobile phone and WiFI module equipped with the same router, through the mobile phone APP to control the relay; this mode, the transmission distance depends on the signal router.
 
 
Tips:
 
ESP8266 module has a timeout mechanism, when the phone for some time (the default 180S) did not give instructions to the module, the module will kick off the phone, the computer can send AT CIPSTO = to modify this time (Time range 0-7200), such as: AT CIPSTO = 3600.
When the module on the WIFI module is unplugged, USB to TTL module RX, TX, GND pins were connected to the module RX, TX, GND pin, IN , IN- 5V power supply, then the module can be used as a USB Relays to use, scalability.
 
 
Shipping list:
 
1 X ESP2866 relay module (don't with ESP-01)

CJMCU - TEMT6000
An ambient light sensor simulation light intensity module Visible light sensor
TEMT6000 sensor maximum sensitivity of 570 nm, it has a plus or minus 60 ° wide half Angle of sensitivity.Although the device is sensitive to ambient light, but it inhibits infrared (IR) spectra, which can provide a similar higher visible spectrum response of the "eye"

Note : more than 3A current discharge products  rate is more than 3C  Ratio calculation formula : 1C rate of the battery , 2000 capacity is  equal to 2AH 1 2A maximum working current . 3C ratio battery , 2000 capacity is equal to 2AH * 3 = 6A maximum  working current . In use battery heats is ratio is not applicable to , this kind of situatic  can't use for a long time , the battery will soon be damaged
Note 1 : in accordance with the diagram wiring 0 V , 3 . 7V ( b- ) ( B1 )  ( B2 ) , 11 . 1 V , 7.4 V ( B ) don't deliberately short circuit
Note 2 : after connected line need to recharge , just can have output
Note 3 : 3 series battery , please make sure that each set of battery  voltage , if not , please separate with each set of batteries in series . Discharge test , the battery voltage drops quickly is a bad battery .
Note : don't put the good cells and in bad ! Three groups of battery  capacity / internal resistance as close as possible ! ( 2 1 good battery ,  the use effect of poor battery = the use effect of three bad battery )

echnical parameters: 
Operating Voltage Range: DC4.5-20V 
Static current: <60uA 
Output level: High 3.3V / Low 0V 
Trigger: repeatable trigger (default) 
Delay time: Default 8S -30% (can be customized range of a few tenths - tens of minutes) 
PCB Dimensions: 10 * 23mm 
Induction angle: <100 degree cone angle 
Induction distance: 3 meters 
Working temperature: -20 - 80 degrees 
Sensor Lens Dimensions: Diameter: 10mm (default)
 
Features: 
Automatic induction: to enter the sensing range of the output is high, people leave the sensor range automatically delay off high, output low. Ultra-small size. 
Repeatable trigger: the sensor output high, the delay period, if there is human activity in its sensing range, the output will remain high until people leave after the high variable delay lOW (automatically extended sensor module detects the human body after every activity a delay period, and the last time an event is the starting point of the delay time). 
Wide operating voltage range: the default operating voltage DC4.5V-20V. 
Micropower: quiescent current <50 microamps, especially for battery-powered automatic control products. 
Output high signal: easy docking and all kinds of circuits.
 
Applications: 
Body induction lamps 
Body sensors toys 
Security Products 
Industrial automation and control 
Auto-sensing of electrical equipment 
Battery-powered automatic control
 

1set 10pcs Alligator Clips Electrical DIY Test Leads Alligator Double-ended Crocodile Clips Roach Clip Test Jumper Wire

100% Brand new and high quality!
Simple and stylish design.
Great for repairing, replacing or making a clock.
Easy and convenient to use.
Specifications:
Material: Plastic & Aluminum
Powered supply:1*AA battery (not included)
Color:Black
Size:56*56*15mm
 

 
 
 

Please receive this module and leave it in the environment with humidity greater than 80% for 12 hours to ensure the accuracy is restored.
        The AHT10, a new generation of temperature and humidity sensors, sets a new standard in size and intelligence: it is embedded in a dual-row flat leadless SMD package for reflow soldering with a 4 x 5mm bottom and a height of 1.6mm. The sensor outputs a calibrated digital signal in standard I 2C format. The AHT10 is equipped with a newly designed ASIC-specific chip, an improved MEMS semiconductor capacitive humidity sensing element and a standard on-chip temperature sensing element. Its performance has been greatly improved beyond the reliability level of previous generation sensors. The first generation of temperature and humidity sensors have been improved to make them more stable in harsh environments.
Characteristic:
1. Module size: 16*11 mm
2. Interface type: I2C
3. Working voltage: 1.8 - 6.0 V
4. Interface size: 4*2.54mm pitch
5. Humidity accuracy: typical ± 2%
6. Humidity resolution: 0.024%
7. Temperature accuracy: typical ± 0.3 ° C
8. Temperature resolution: Typical 0.01 °C
9. Working temperature: -40°C--85°C

Module Parameters
Module Properties:  non-isolated buck module (BUCK) synchronous rectification
Input voltage:  DC 6-24V
Output voltage:  5.1-5.2V
Output current: 3A MAX 
Conversion efficiency:  can up to 97.5% (6.5V step down to 5V 0.7A) (after short reverse protection and fuses test value)
Switch frequency:  500KHz
Output ripple: 10mV around (12V to 5V3A) 20M bandwidth
Output indicator: Output voltage indicator is red
Operating temperature: Industrial grade (-40 Celsuis to 85 Celsuis) (the higher the ambient temperature, the lower the output power)
Output overvoltage protection: Yes, input 1.5A fuse, output 5V have 300W TVS tube clamp protection.
Full load temperature: 30 Celsuis
Static current: 0.85 mA
Load regulation:  ± 1%
Voltage Regulation:  ± 0.5%
Dynamic response speed:  5% 200uS
Output short circuit protection: Yes, but please do not short circuit for a long time
Input reverse polarity protection: Yes, there is reverse polarity protection diode
Connection mode:  Welding
Input mode:  Welding
Output mode: US

Up for sale is a MELEXIS MLX90614ESF-BAA-000-TU-ND non-contact infrared thermometer for Arduino, 
or any microcontroller that can communicate with it through it's I2C interface. 
This sensor comes with a breakout board with all of the components needed for operation and two types of pins. 
They are unsoldered. Please indicate if you would like one or the other soldered. 
There are two solder jumpers for the I2C interface that may or may not need to be soldered depending on your application, 
but will not for most uses.
 
 
Features and Benefits: 
 
 
Small size, low cost 
Mounted on a breakout board with two types of pins 
10k Pull up resistors for the I2C interface with optional solder jumpers 
Easy to integrate 
Factory calibrated in wide temperature range: 
-40… 125°C for sensor temperature and 
-70… 380°C for object temperature. 
High accuracy of 0.5°C over wide temperaturerange 
(0… 50°C for both Ta and To) High (medical) accuracy calibration 
Measurement resolution of 0.02°C 
Single and dual zone versions 
SMBus compatible digital interface 
Customizable PWM output for continuousreading 
Simple adaptation for 8…16V applications 
Sleep mode for reduced power consumption 
Different package options for applications andmeasurements versatility 
Automotive grade
 
 
Applications Examples: 
 
 
High precision non-contact temperaturemeasurements 
Thermal Comfort sensor for Mobile AirConditioning control system 
Temperature sensing element for residential, 
commercial and industrial building airconditioning Windshield defogging 
Automotive blind angle detection 
Industrial temperature control of moving parts 
Temperature control in printers and copiers 
Home appliances with temperature control 
Healthcare 
Livestock monitoring 
Movement detection 
Multiple zone temperature control – up to 127sensors can be read via common 2 wires 
Thermal relay / alert

Size: 22.3mm*17mm*4.2mm
Input Voltage:5.3V-26V
Output Voltage:5V
Output Current: 3A(Max)
Working Temperature:-40c-85c
Switching Frequency: 1.5MHz
Conversion efficiency: 96%

The color is sent at random

Working voltage: 1.7V3.6V
Working temperature: -40 ℃ ~ 85 ℃
Communication interface: 12C (up to 3.4 MHz) and SPI (3 and 4 wires, up to 10 MHz)
Humidity, pressure and gas sensors can be enabled / disabled individually
The current consumption at 1 Hz humidity and temperature is 2.1 LA, the current consumption at 1 Hz pressure and temperature is 3.1 LA, and the current consumption at 1 Hz humidity, pressure and temperature is 3.7 LA
Gas sensor parameters: response time (33-63% ) <1s (for new sensors) power consumption in ultra-low power mode <0.1 mA output data processing direct indoor air quality (IAQ) index output humidity sensor parameters: response time (0 -83% ) ~ 8s
Accuracy tolerance ± 396r ..
Hysteresis ± 1.5% r.h.
Pin definition
vCC: Power supply is positive
GND: ground
SCL: 12C / SP1 clock line
SDA: 12C / SP! Data cable
sDO: SPI data cable
CS: SPI1 slave enable

Free Shipping 10Pcs NRF24L01 Wireless Module 2.4G Wireless Communication Module Upgrade Module
 
100% Brand new and high quality.
NRF24L01 2.4GHz Antenna Wireless Transceiver Module
Maximum operating speeds up to 2Mbps, GFSK modulation efficiency, Anti-interference ability, particularly suitable for industrial control applications
125 Channels, Multi-point communication and frequency hopping to meet the communication needs
Available software to set the address, only received local Address when output data(Provide interrupt instruction), can be directly connected to a variety of microcontrollers, Software programming is very convenient.
Built-in hardware CRC error detection, Multipoint communication address control
Standard DIP Pitch Interface for embedded applications
Low-power 1.9 ~ 3.6V, only 1uA on Power down mode
Built-in 2.4GHz antenna
Color: Black
Size: Approx. 2.5 x 1.5 x 1cm (L*W*H)

Free Shipping 10Pcs NRF24L01 Wireless Module 2.4G Wireless Communication Module Upgrade Module
 
100% Brand new and high quality.
NRF24L01 2.4GHz Antenna Wireless Transceiver Module
Maximum operating speeds up to 2Mbps, GFSK modulation efficiency, Anti-interference ability, particularly suitable for industrial control applications
125 Channels, Multi-point communication and frequency hopping to meet the communication needs
Available software to set the address, only received local Address when output data(Provide interrupt instruction), can be directly connected to a variety of microcontrollers, Software programming is very convenient.
Built-in hardware CRC error detection, Multipoint communication address control
Standard DIP Pitch Interface for embedded applications
Low-power 1.9 ~ 3.6V, only 1uA on Power down mode
Built-in 2.4GHz antenna
Color: Black
Size: Approx. 2.5 x 1.5 x 1cm (L*W*H)

 
 
 

 
 
 

DC Power Shield V1.1.0 for WEMOS D1 mini

One Channel Wemos D1 Mini Relay Shield Wemos D1 Mini Relay Module for Arduino ESP8266 Development Board

Working parameters:
Pyroelectric human body infrared sensor module, model: SR-602
Sensing distance: up to 5 meters; recommended 0-3.5M.
Output: high level, H=3.3V, L=0V
Power supply DC: 3.3V-15V
Quiescent current: 20uA
Features and uses:
This module has high sensitivity, fast response, small static power consumption, small size, easy to install, and is installed.
The lens, the pin header has been soldered, and the power supply is provided without debugging. Can be used for body sensor lights, alarms, security,
Access control on-demand imaging, automatic equipment for agriculture, forestry and mining.
Key points:
1. The high level time of the output of this product is adjustable, 2.5 seconds to 1 hour, the output time set at the factory.
It is 2.5 seconds, and you can change one chip resistor if you need to change it. Please read the resistance value corresponding to the typical delay time.
Refer to the relevant form below.
2. Blocking time, 2 seconds, not adjustable.
3. The factory is defined as repeatable trigger and cannot be changed.
4. The supply voltage of this module is 3.3V to 15V, and the limit voltage is 2.8V to 18V.
5. Module output timing is: output high level for 2 seconds after power-on, then go low, enter standby
status. If the delay time is changed, the time when the module outputs a high level after power-on will increase accordingly, which can be understood as
The startup time after entering the normal working state after the electric power will increase.
6. After installing the photosensitive element, it does not work during the day, work at night, does not contain photosensitive components, and works all day ( There are no photodiodes on the module,please purchase separately if needed. Recommended: ordinary F3 photodiode )
It is considered that there is no photosensitive element installed.
7. This module is very sensitive, pay attention to the installation position, try to avoid the heat source radiation source (air outlet / direct sunlight)
8. The sensitivity of this module is adjustable, and you need to change a chip resistor. Please read the relevant table below for details.
grid.
9. When soldering with 220V ordinary soldering iron, it is necessary to unplug the power supply before welding. It is recommended to use
24V low voltage soldering iron, such as domestic white light 936.
10. If you follow the MCU and connect the lamp, please read the reference circuit diagram below.

LM2596 LM2596S DC-DC 4.5-40V adjustable step-down power Supply module 
 
Name : LM2596 DC-DC Buck module
Input voltage :4V ~ 35V
The output voltage : 1.23V ~ 30V
Output Current :3A( Max)
Conversion efficiency:92% ( MAX )
Output ripple: <30mV
Switching frequency: 150KHz
Working temperature: -forty Five~ 85
Size :43mm * 21mm * 14mm(Long*Width*Hight)
Features:
1. the range of input voltage: 3.2 V to 40 V dc (input voltage must be higher than to the output voltage of 1.5 V above. Can't booster)
2. the range of output voltage: 1.25 V dc to 35 V voltage adjustable, high efficiency (92% ) largest maximum output current is 3A.
 
Instructions:
1. Power (3-40V), power indicator light, the module is working properly.
 
2. Adjust the blue potentiometer knob (clockwise rotation generally boost,counter-clockwise rotationTurn down) and reach with a multimeter to monitor the output voltage required voltage.
 
Note:
 
  Current work long hours is recommended for use in less than 2.5A, while adding bulkHeat sink (10W output above),because it is the step-down module, in order to ensure stable output Set,please keep the minimum 1.5V differential.

LM2596 LM2596S DC-DC 4.5-40V adjustable step-down power Supply module 
 
Name : LM2596 DC-DC Buck module
Input voltage :4V ~ 35V
The output voltage : 1.23V ~ 30V
Output Current :3A( Max)
Conversion efficiency:92% ( MAX )
Output ripple: <30mV
Switching frequency: 150KHz
Working temperature: -forty Five~ 85
Size :43mm * 21mm * 14mm(Long*Width*Hight)
Features:
1. the range of input voltage: 3.2 V to 40 V dc (input voltage must be higher than to the output voltage of 1.5 V above. Can't booster)
2. the range of output voltage: 1.25 V dc to 35 V voltage adjustable, high efficiency (92% ) largest maximum output current is 3A.
 
Instructions:
1. Power (3-40V), power indicator light, the module is working properly.
 
2. Adjust the blue potentiometer knob (clockwise rotation generally boost,counter-clockwise rotationTurn down) and reach with a multimeter to monitor the output voltage required voltage.
 
Note:
 
  Current work long hours is recommended for use in less than 2.5A, while adding bulkHeat sink (10W output above),because it is the step-down module, in order to ensure stable output Set,please keep the minimum 1.5V differential.

Features:
Material: PCB
Font size guide, trace-width diagram, and a set of AWG-sized drills
Centimeter side: 0.1cm marks
 

MC-38 Wired Door Window Sensor 330mm Wire Lengthen Randomly Magnetic Switch Home Alarm System N.C Type

Description:
Features:
USB to RS485 Converter Adapter
USB connector: to your PC
RS485 connector: to your RS485 device
No need external power, powered by USB port
Fully compliant USB 2.0 standard , backward compatible with USB1.1
Applications:
All kinds with RS485 port device parameter settings , data communication
Short distance , such as parameter settings of the computer peripheral equipment , the use of common data lines can be .
A and A port of the device when the wiring is connected , B and device B connected . Some devices D A and D, - B .
? LED display of communication data
? Machine PLC data reading and writing
? Monitoring data read and write , and PTZ control
? Centralized control of household electrical appliances
? Access Control System ; card
? A variety of industrial automation ; instrumentation
? Parking ; bus fees
? Dining Hall ; staff attendance
? Highway toll station; ATM machine
Specification:
Dimension:6.0 x1.8x1.4cm
Color: Black
Net weight: 8g
Packaging weight: 18g
Support System: Windows XP , Vista, Windows 7 , Linux , MacOS , and WinCE5.0 drive
Supports baud rate range : 75bps - 115200bps , up to 6Mbps
Supports Plug , Play and hot-swap ( USB side) ;
Better than using CH341D chip or similar chip to support the laptop USB port .
Communication distance up to 1.2KM, with anti-jamming performance of industrial site ;
Work temperature range: -40
Communication distance :1200m(max)
Package Content:
1 x USB to RS485 Converter
Note:
A. Import duties, taxes and charges are not included in the item price or shipping charges. These charges are the buyer's responsibility. 
B. Please check with your country's customs office to determine what these additional costs will be prior to bidding/buying. 
C. We only ship to confirmed order address,your order address Must Match your recipient address.

Working voltage: 1.7V3.6V
Working temperature: -40 ℃ ~ 85 ℃
Communication interface: 12C (up to 3.4 MHz) and SPI (3 and 4 wires, up to 10 MHz)
Humidity, pressure and gas sensors can be enabled / disabled individually
The current consumption at 1 Hz humidity and temperature is 2.1 LA, the current consumption at 1 Hz pressure and temperature is 3.1 LA, and the current consumption at 1 Hz humidity, pressure and temperature is 3.7 LA
Gas sensor parameters: response time (33-63% ) <1s (for new sensors) power consumption in ultra-low power mode <0.1 mA output data processing direct indoor air quality (IAQ) index output humidity sensor parameters: response time (0 -83% ) ~ 8s
Accuracy tolerance ± 396r ..
Hysteresis ± 1.5% r.h.
Pin definition
vCC: Power supply is positive
GND: ground
SCL: 12C / SP1 clock line
SDA: 12C / SP! Data cable
sDO: SPI data cable
CS: SPI1 slave enable

1.Output Power:500mW (driving earphone);3Wx2 (driving loudspeaker)
2.Frequency Response Range:50Hz-18KHz
3.Receiving Frequency Range:87.0MHz-108.0MHz (campus broadcast power off);76.0MHz-108.0MHz (campus broadcast power on)
4.Equivalent Noise:>=30dB
5.Power Supply Voltage:3.0V-5.0V
6.Power Supply Current:1000mA (max volume);60mA (minimum volume)
7.Sound Track;stereo
Features:
1.Adopt DSP And FM PLL Technique
2.LCD Display
3.30 Levels Digital Volume Adjustment
4.Power Off Automatic Memory Previous Data
5.Loudspeaker/Earphone Output Automatic Shift
6.Adopt Quartz Crystal Stabilizing Frequency
7.Adopt Audio DSP To Analyse Audio Signal
8.Adopt Incremental Digital Rotary Encoder To Adjust Volume And Frequency
9.30 Levels Digital Volume Adjustment Range
10.Support Serial Port Communication Control

 1 channel relay module
 
Maximum load: AC 250V/10A, DC 30V/10A
Trigger current: 5mA
Working voltage: 5V
Module size: 50 x 26 x 18.5mm (L x W x H)
Four mounting bolts holes, diameter 3.1mm
DC : positive power supply (VCC)
DC-: negative power supply (GND)
IN: can be high or low level control relay
NO: normally open relay interface
COM: Common Interface Relays
NC: normally closed relay interface

This analog capacitive soil moisture sensor measures soil moisture levels by capacitive sensing, rather than resistive sensing like other types of moisture sensor
It is made of a corrosion resistant material giving it a long service life
Insert it into soil and impress your friends with the real-time soil moisture data
This module includes an on-board voltage regulator which gives it an operating voltage range of 3.3 ~ 5.5V
This sensor is compatible with DFRobot 3-pin "Gravity" interface, which can be directly connected to the Gravity I/O expansion shield
 
Features:
Supports 3-Pin Gravity Sensor interface
Analog output
 
Applications:
Garden plants
Moisture detection
Intelligent agriculture
 
Specifications:
Operating Voltage: DC 3.3-5.5V
Output Voltage: DC 0-3.0V
Interface: PH2.0-3P
Size: 99x16mm/3.9x0.63"
Quantity: 10 Set
 
Note:
Please allow 1-3mm error due to manual measurement.pls make sure you do not mind before you bid
Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!
 
No Retail Package
Package Includes:
10 x Capacitive Soil Moisture Sensor
10 x Analog Sensor Cable

Features :
100% Brand New
Voltage: DC 6-36V
Output current: 300mA
3 Wire
Polarity: NPN
Dimention: M12x10x55mm
Detection Distance: 4 mm
Ouput Status: Normally Open
Part number: LJ12A3-4-Z/BX
Detection objects: Conductor

Notice: The new tracking number for China Post Ordinary Small Packet Plus can be traced only befor it arrive the airport of your country,please choose China Post Air Mail if you want a full tracking info.
 
Tracking info of  China Post Ordinary Small Packet Plus can be check here: www.17track.net/en
 
Product Details
FM Stereo Radio Module RDA5807M RRD-102V2.0 Wireless Module Pro New for Arduino
Article-Nr.:5400777
Product Details:
Stereo Module
Condition: New
Overview: 
"RRD-102V2.0" stereo radio module (FM Stereo radio Module) high sensitivity, low power consumption,ultra- small size of the FM stereo radio module.Using RDA Microelectronics of RDA5807M(or RDA5802NM),this circuit fewer external components,the noise factor is minimal. Small size,low power consumption,low cost,simple application,the use of a wide range of advantages.Is an easy-to-use and possessed highly cost-effective single-chip FM stereo radio module.
A: Move DVD,TV,MP3,MP4 and other built-in FM wide-band wireless receiver module. 
B: mining,business,campus,residential,tourist areas and other public places,stereo FM radio
system. 
C: wireless audio and wireless stereo headset functionality. 
D: GPS navigation, TV broadcasting systems and other wireless FM radio.
E: high-end game consoles and wireless audio electronic toys.
F: mobile phones,mobile phones,intercom systems,mobile radio devices and other stereo radio.
G: PDAS and Notebook PC and other peripheral applications.
 
Function:
A: using a common 102BC module package,users can directly replace the use,without changing the circuit design. 
B: high sensitivity,low noise,anti-interference ability,very few external components,small size (11*11.2MM Max),extremely simple to use. 
C: 76-108MHz FM band worldwide compatible(76-91MHz,including Japan,America and Europe 87.5-108.5MHz). 
D: I2C serial data communications bus interface,support for external reference clock input.
E: COMS technology fully integrated single-chip integrated circuits,power consumption is minimal.
F: built-in high-precision A/D(analog) and digital frequency synthesizer.
G: built-in LDO regulator,low power,wide voltage range(2.7-3.6VDC). 
H: built-in noise reduction, soft mute,bass boost circuit design.
I: 32 load high power audio output,headphone connections are direct,no external audio driver amplifier. 
J: the application is simple,low cost,cost-effective.
Color : show as pictures
PLS NOTE that due to lighting effects, monitor's brightness / contrast settings etc, there could be some slight differences in the color tone of the pictures and the actual item!

The shield is fully assembled, tested and ready to go. No wiring, no soldering! Simply plug it in and load up our library - you'll have it running in under 10 minutes! Works best with any classic  (UNO/Duemilanove/Diecimila). This shield does NOT work with the Mega but its going to be half the speed of the Uno-type boards because of the way the Mega rearranges all the pins (there is no way to get around this!) This shield is not Leonardo-compatible
Description:
Spice up your project with a beautiful large touchscreen display shield with built in microSD card connection. This TFT display is big (2.4" diagonal) bright (4 white-LED backlight) and colorful (18-bit 262,000 different shades)! 240x320 pixels with individual pixel control. It has way more resolution than a black and white 128x64 display. As a bonus, this display has a resistive touchscreen attached to it already, so you can detect finger presses anywhere on the screen.
 
Technical Details:
2.4" diagonal LCD TFT display
240x320 resolution, 18-bit (262,000) color
spfd5408 controller with built in video RAM buffer
8 bit digital interface, plus 4 control lines
Uses digital pins 5-13 and analog 0-3. That means you can use digital pins 2, 3 and analog 4 and 5. Pin 12 is available if not using the microSD
Works with any '328 or Mega (Leonardo not supported yet)
5V compatible! Use with 3.3V or 5V logic
Onboard 3.3V 300mA LDO regulator
4 white LED backlight. On by default but you can connect the transistor to a digital pin for backlight control
4-wire resistive touch screen
   

Features:
1.Battery type electricity quantity display 2.Wide application fields:lithium battery 3.Using Method:connect display board positive and negative port with tested battery positive and negative port,digital tube will display real-time battery electricity quantity 4.Digital Color:outline red,display block blue (when battery electricity quantity is full,it will be all on) Display Electricity Quantity Parameter: 1.When battery voltage is over N*3.3V,it will illuminate 1 block electricity quantity (note:N represents battery quantity) 2.When battery voltage is over N*3.5V,it will illuminate 2 blocks electricity quantity 3.When battery voltage is over N*3.7V,it will illuminate 3 blocks electricity quantity 4.When battery voltage is over N*3.9V,it will illuminate 4 blocks electricity quantity 5.When battery voltage is less than N*3.3V,4 blocks display will be off;it represents battery is less than 3.3V,and you can charge the battery
 
 
Features:
1.Battery type electricity quantity display
2.Wide application fields:lithium battery
3.Using Method:connect display board positive and negative port with tested battery positive
and negative port,digital tube will display real-time battery electricity quantity
4.Digital Color:outline red,display block blue (when battery electricity quantity is full,
it will be all on)
Display Electricity Quantity Parameter:
1.When battery voltage is over N*3.3V,it will illuminate 1 block electricity quantity
(note:N represents battery quantity)
2.When battery voltage is over N*3.5V,it will illuminate 2 blocks electricity quantity
3.When battery voltage is over N*3.7V,it will illuminate 3 blocks electricity quantity
4.When battery voltage is over N*3.9V,it will illuminate 4 blocks electricity quantity
5.When battery voltage is less than N*3.3V,4 blocks display will be off;it represents battery
is less than 3.3V,and you can charge the battery
 
 
 
 
 
 
 
 
Battery-type power display, select the corresponding pad on the tin, you can detect the battery voltage corresponding to 1S-8S, very convenient.
Product parameters: 1、Working voltage: 3-34V, working current 5mA. 2、Working temperature: -20~50 °C 3、The voltage error is 2% (requires higher accuracy, do not shoot) 4、Size: 43.5 * 20cm
Warm sound tips: This model is not waterproof. If it is used outdoors, please waterproof it, because the electronic components should be used in a dry environment. Lithium-ion battery The battery indicator board that can be used in Ni-MH batteries, as long as the required voltage is within the range of the parameter list. How to use: Connect the positive and negative terminals of the display board to the positive and negative terminals of the battery under test. The digital tube displays the real-time battery power.
1. Battery-type power display, select the corresponding pad on the tin, you can detect the battery voltage corresponding to 1S-8S, very convenient.

Features:
1.Battery type electricity quantity display 2.Wide application fields:lithium battery 3.Using Method:connect display board positive and negative port with tested battery positive and negative port,digital tube will display real-time battery electricity quantity 4.Digital Color:outline red,display block blue (when battery electricity quantity is full,it will be all on) Display Electricity Quantity Parameter: 1.When battery voltage is over N*3.3V,it will illuminate 1 block electricity quantity (note:N represents battery quantity) 2.When battery voltage is over N*3.5V,it will illuminate 2 blocks electricity quantity 3.When battery voltage is over N*3.7V,it will illuminate 3 blocks electricity quantity 4.When battery voltage is over N*3.9V,it will illuminate 4 blocks electricity quantity 5.When battery voltage is less than N*3.3V,4 blocks display will be off;it represents battery is less than 3.3V,and you can charge the battery
 
 
Features:
1.Battery type electricity quantity display
2.Wide application fields:lithium battery
3.Using Method:connect display board positive and negative port with tested battery positive
and negative port,digital tube will display real-time battery electricity quantity
4.Digital Color:outline red,display block blue (when battery electricity quantity is full,
it will be all on)
Display Electricity Quantity Parameter:
1.When battery voltage is over N*3.3V,it will illuminate 1 block electricity quantity
(note:N represents battery quantity)
2.When battery voltage is over N*3.5V,it will illuminate 2 blocks electricity quantity
3.When battery voltage is over N*3.7V,it will illuminate 3 blocks electricity quantity
4.When battery voltage is over N*3.9V,it will illuminate 4 blocks electricity quantity
5.When battery voltage is less than N*3.3V,4 blocks display will be off;it represents battery
is less than 3.3V,and you can charge the battery
 
 
 
 
 
 
 
 
Battery-type power display, select the corresponding pad on the tin, you can detect the battery voltage corresponding to 1S-8S, very convenient.
Product parameters: 1、Working voltage: 3-34V, working current 5mA. 2、Working temperature: -20~50 °C 3、The voltage error is 2% (requires higher accuracy, do not shoot) 4、Size: 43.5 * 20cm
Warm sound tips: This model is not waterproof. If it is used outdoors, please waterproof it, because the electronic components should be used in a dry environment. Lithium-ion battery The battery indicator board that can be used in Ni-MH batteries, as long as the required voltage is within the range of the parameter list. How to use: Connect the positive and negative terminals of the display board to the positive and negative terminals of the battery under test. The digital tube displays the real-time battery power.
1. Battery-type power display, select the corresponding pad on the tin, you can detect the battery voltage corresponding to 1S-8S, very convenient.

Features:
1.Battery type electricity quantity display 2.Wide application fields:lithium battery 3.Using Method:connect display board positive and negative port with tested battery positive and negative port,digital tube will display real-time battery electricity quantity 4.Digital Color:outline red,display block blue (when battery electricity quantity is full,it will be all on) Display Electricity Quantity Parameter: 1.When battery voltage is over N*3.3V,it will illuminate 1 block electricity quantity (note:N represents battery quantity) 2.When battery voltage is over N*3.5V,it will illuminate 2 blocks electricity quantity 3.When battery voltage is over N*3.7V,it will illuminate 3 blocks electricity quantity 4.When battery voltage is over N*3.9V,it will illuminate 4 blocks electricity quantity 5.When battery voltage is less than N*3.3V,4 blocks display will be off;it represents battery is less than 3.3V,and you can charge the battery
 
 
Features:
1.Battery type electricity quantity display
2.Wide application fields:lithium battery
3.Using Method:connect display board positive and negative port with tested battery positive
and negative port,digital tube will display real-time battery electricity quantity
4.Digital Color:outline red,display block blue (when battery electricity quantity is full,
it will be all on)
Display Electricity Quantity Parameter:
1.When battery voltage is over N*3.3V,it will illuminate 1 block electricity quantity
(note:N represents battery quantity)
2.When battery voltage is over N*3.5V,it will illuminate 2 blocks electricity quantity
3.When battery voltage is over N*3.7V,it will illuminate 3 blocks electricity quantity
4.When battery voltage is over N*3.9V,it will illuminate 4 blocks electricity quantity
5.When battery voltage is less than N*3.3V,4 blocks display will be off;it represents battery
is less than 3.3V,and you can charge the battery
 
 
 
 
 
 
 
 
Battery-type power display, select the corresponding pad on the tin, you can detect the battery voltage corresponding to 1S-8S, very convenient.
Product parameters: 1、Working voltage: 3-34V, working current 5mA. 2、Working temperature: -20~50 °C 3、The voltage error is 2% (requires higher accuracy, do not shoot) 4、Size: 43.5 * 20cm
Warm sound tips: This model is not waterproof. If it is used outdoors, please waterproof it, because the electronic components should be used in a dry environment. Lithium-ion battery The battery indicator board that can be used in Ni-MH batteries, as long as the required voltage is within the range of the parameter list. How to use: Connect the positive and negative terminals of the display board to the positive and negative terminals of the battery under test. The digital tube displays the real-time battery power.
1. Battery-type power display, select the corresponding pad on the tin, you can detect the battery voltage corresponding to 1S-8S, very convenient.

Features:
1.Battery type electricity quantity display 2.Wide application fields:lithium battery 3.Using Method:connect display board positive and negative port with tested battery positive and negative port,digital tube will display real-time battery electricity quantity 4.Digital Color:outline red,display block blue (when battery electricity quantity is full,it will be all on) Display Electricity Quantity Parameter: 1.When battery voltage is over N*3.3V,it will illuminate 1 block electricity quantity (note:N represents battery quantity) 2.When battery voltage is over N*3.5V,it will illuminate 2 blocks electricity quantity 3.When battery voltage is over N*3.7V,it will illuminate 3 blocks electricity quantity 4.When battery voltage is over N*3.9V,it will illuminate 4 blocks electricity quantity 5.When battery voltage is less than N*3.3V,4 blocks display will be off;it represents battery is less than 3.3V,and you can charge the battery
 
 
Features:
1.Battery type electricity quantity display
2.Wide application fields:lithium battery
3.Using Method:connect display board positive and negative port with tested battery positive
and negative port,digital tube will display real-time battery electricity quantity
4.Digital Color:outline red,display block blue (when battery electricity quantity is full,
it will be all on)
Display Electricity Quantity Parameter:
1.When battery voltage is over N*3.3V,it will illuminate 1 block electricity quantity
(note:N represents battery quantity)
2.When battery voltage is over N*3.5V,it will illuminate 2 blocks electricity quantity
3.When battery voltage is over N*3.7V,it will illuminate 3 blocks electricity quantity
4.When battery voltage is over N*3.9V,it will illuminate 4 blocks electricity quantity
5.When battery voltage is less than N*3.3V,4 blocks display will be off;it represents battery
is less than 3.3V,and you can charge the battery
 
 
 
 
 
 
 
 
Battery-type power display, select the corresponding pad on the tin, you can detect the battery voltage corresponding to 1S-8S, very convenient.
Product parameters: 1、Working voltage: 3-34V, working current 5mA. 2、Working temperature: -20~50 °C 3、The voltage error is 2% (requires higher accuracy, do not shoot) 4、Size: 43.5 * 20cm
Warm sound tips: This model is not waterproof. If it is used outdoors, please waterproof it, because the electronic components should be used in a dry environment. Lithium-ion battery The battery indicator board that can be used in Ni-MH batteries, as long as the required voltage is within the range of the parameter list. How to use: Connect the positive and negative terminals of the display board to the positive and negative terminals of the battery under test. The digital tube displays the real-time battery power.
1. Battery-type power display, select the corresponding pad on the tin, you can detect the battery voltage corresponding to 1S-8S, very convenient.

Features:
1.Battery type electricity quantity display 2.Wide application fields:lithium battery 3.Using Method:connect display board positive and negative port with tested battery positive and negative port,digital tube will display real-time battery electricity quantity 4.Digital Color:outline red,display block blue (when battery electricity quantity is full,it will be all on) Display Electricity Quantity Parameter: 1.When battery voltage is over N*3.3V,it will illuminate 1 block electricity quantity (note:N represents battery quantity) 2.When battery voltage is over N*3.5V,it will illuminate 2 blocks electricity quantity 3.When battery voltage is over N*3.7V,it will illuminate 3 blocks electricity quantity 4.When battery voltage is over N*3.9V,it will illuminate 4 blocks electricity quantity 5.When battery voltage is less than N*3.3V,4 blocks display will be off;it represents battery is less than 3.3V,and you can charge the battery
 
 
Features:
1.Battery type electricity quantity display
2.Wide application fields:lithium battery
3.Using Method:connect display board positive and negative port with tested battery positive
and negative port,digital tube will display real-time battery electricity quantity
4.Digital Color:outline red,display block blue (when battery electricity quantity is full,
it will be all on)
Display Electricity Quantity Parameter:
1.When battery voltage is over N*3.3V,it will illuminate 1 block electricity quantity
(note:N represents battery quantity)
2.When battery voltage is over N*3.5V,it will illuminate 2 blocks electricity quantity
3.When battery voltage is over N*3.7V,it will illuminate 3 blocks electricity quantity
4.When battery voltage is over N*3.9V,it will illuminate 4 blocks electricity quantity
5.When battery voltage is less than N*3.3V,4 blocks display will be off;it represents battery
is less than 3.3V,and you can charge the battery
 
 
 
 
 
 
 
 
Battery-type power display, select the corresponding pad on the tin, you can detect the battery voltage corresponding to 1S-8S, very convenient.
Product parameters: 1、Working voltage: 3-34V, working current 5mA. 2、Working temperature: -20~50 °C 3、The voltage error is 2% (requires higher accuracy, do not shoot) 4、Size: 43.5 * 20cm
Warm sound tips: This model is not waterproof. If it is used outdoors, please waterproof it, because the electronic components should be used in a dry environment. Lithium-ion battery The battery indicator board that can be used in Ni-MH batteries, as long as the required voltage is within the range of the parameter list. How to use: Connect the positive and negative terminals of the display board to the positive and negative terminals of the battery under test. The digital tube displays the real-time battery power.
1. Battery-type power display, select the corresponding pad on the tin, you can detect the battery voltage corresponding to 1S-8S, very convenient.

Features:
1.Battery type electricity quantity display 2.Wide application fields:lithium battery 3.Using Method:connect display board positive and negative port with tested battery positive and negative port,digital tube will display real-time battery electricity quantity 4.Digital Color:outline red,display block blue (when battery electricity quantity is full,it will be all on) Display Electricity Quantity Parameter: 1.When battery voltage is over N*3.3V,it will illuminate 1 block electricity quantity (note:N represents battery quantity) 2.When battery voltage is over N*3.5V,it will illuminate 2 blocks electricity quantity 3.When battery voltage is over N*3.7V,it will illuminate 3 blocks electricity quantity 4.When battery voltage is over N*3.9V,it will illuminate 4 blocks electricity quantity 5.When battery voltage is less than N*3.3V,4 blocks display will be off;it represents battery is less than 3.3V,and you can charge the battery
 
 
Features:
1.Battery type electricity quantity display
2.Wide application fields:lithium battery
3.Using Method:connect display board positive and negative port with tested battery positive
and negative port,digital tube will display real-time battery electricity quantity
4.Digital Color:outline red,display block blue (when battery electricity quantity is full,
it will be all on)
Display Electricity Quantity Parameter:
1.When battery voltage is over N*3.3V,it will illuminate 1 block electricity quantity
(note:N represents battery quantity)
2.When battery voltage is over N*3.5V,it will illuminate 2 blocks electricity quantity
3.When battery voltage is over N*3.7V,it will illuminate 3 blocks electricity quantity
4.When battery voltage is over N*3.9V,it will illuminate 4 blocks electricity quantity
5.When battery voltage is less than N*3.3V,4 blocks display will be off;it represents battery
is less than 3.3V,and you can charge the battery
 
 
 
 
 
 
 
 
Battery-type power display, select the corresponding pad on the tin, you can detect the battery voltage corresponding to 1S-8S, very convenient.
Product parameters: 1、Working voltage: 3-34V, working current 5mA. 2、Working temperature: -20~50 °C 3、The voltage error is 2% (requires higher accuracy, do not shoot) 4、Size: 43.5 * 20cm
Warm sound tips: This model is not waterproof. If it is used outdoors, please waterproof it, because the electronic components should be used in a dry environment. Lithium-ion battery The battery indicator board that can be used in Ni-MH batteries, as long as the required voltage is within the range of the parameter list. How to use: Connect the positive and negative terminals of the display board to the positive and negative terminals of the battery under test. The digital tube displays the real-time battery power.
1. Battery-type power display, select the corresponding pad on the tin, you can detect the battery voltage corresponding to 1S-8S, very convenient.