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For Nano IO Expansion Shield is specifically designed to facilitate an easy connection between FOR Arduino Nano and many other devices. In essence, it expands the Nano controller to link those devices in a simple and trouble free manner. It is a perfect companion of Nano breadboard and compatible with both Nano v2.x and v3.x.
This expansion shield provides:
14 I/O Pin (servo type with GND, power and signal)
8 analog Pin with power output and GND
6 PWM Pin
1 Servo power input
5 I2C expansion Pin
AREF output
3.3V output

I2C/SPI BMP280 3.3 Digital Barometric Pressure Altitude Sensor High Precision Atmospheric Module Replace BMP180

Glass　Length

14mm
Glass　Diameter

2mm
Total　Length

45mm
Contact Form

A
Max. Switching Voltage

300 VDC
Min. Breakdown Voltage

150 VDC
Max. Contact Rating

10W
Max. Switching Current

0.55 A
Max. Operate time

0.45 ms
Bounce time

0.25 ms
Max. Release time

0.35 ms
Resonant Frequency

5000 HZ
Max. Operating Frequency

400 HZ
Pull in Value

20-70 AT
Min. Drop out Value

4 AT
Max. Contact Capacitance

0.5 pF
Electrical Life

50mV-10μA-1x106

Description:
The whole network smallest adjustable boost module can be easily installed in a variety of small equipment.
The module supports MicroUSB input, a USB charger or mobile power supply can easily get to it 9V, 12V, 15V, 18V, 24V, easy to use.
Wide input and output voltage, high conversion efficiency.
Maximum output current: 2A (recommended for use within 1A)
Input voltage: 2 v ~ 24 v
Maximum output voltage:> 28 v (recommended for use within 26V)
Efficiency:> 93%
Size: 30mm * 17mm * 14mm (L * W * H)
This module is a step-up module, the output voltage is greater than the input voltage.
Peak current output current does not exceed 2A.
 
Note:
1. Input voltage should not exceed the maximum input voltage
2. Peak current output current does not exceed 2A
3. When the module output voltage can not be adjusted, always equal to the input voltage when the first 20 laps counterclockwise rotary potentiometer or more, then you can use the module properly regulate the voltage. Surge mode: potentiometer face chest, counterclockwise turn boost!
 
 
 

Electrical parameters: JSN-SR04T
Operating voltage: DC 5V
Quiescent current: 5mA
Total current work: 30mA
Acoustic emission frequency: 40khz
Farthest distance: 4.5m
Blind: 25cm
Wiring: 5V (positive power supply)
Trig (control side) RX
Echo (the receiver) TX
GND (negative)
Module size: 41mm * 28.5mm
Resolution: about 0.5cm
Angle: less than 50 degrees
Working temperature: -10 ~ 70 °
Storage temperature: -20 ~ 80 °
Product Features:
1, small size, easy to use;
2, low voltage, low power consumption;
3, high accuracy;
4, strong anti-jamming;
5, integrated with wire enclosed waterproof probe, suitable for wet, harsh measurement occasions.
Application:
1, Horizontal distance;
2, obstacle avoidance, automatic control;
3, the object approaches, there is a perceived
4, traffic control;
5, security, industrial control;
6, artificial intelligence, and research
The basic working principle:
(1) using IO port TRIG trigger location, to the high level signal of at least 10us;
(2) module automatically sends 8 40KHz Fang Bo, automatic detecting whether a signal return;
(3) a signal return, a high level is output through the IO port ECHO, the time duration of the high level is
ultrasonic from launch to return. The test distance = (high level time * speed of sound (340M/S)) /2;
This module uses the simple method, a control port with a 10US above high level, can wait for high level
output at the receiving port. An output can drive the timer, when this port is low can read the timer value,
this time for the location of the time, can be calculated distance. So constantly cycle test, that can achieve
the measurement of the value of your mobile.

Mini MP3 Player Module TF Card U Disk Mini MP3 Player Audio Voice Module Board DF Play Wholesale

Description:
The whole network smallest adjustable boost module can be easily installed in a variety of small equipment.
The module supports MicroUSB input, a USB charger or mobile power supply can easily get to it 9V, 12V, 15V, 18V, 24V, easy to use.
Wide input and output voltage, high conversion efficiency.
Maximum output current: 2A (recommended for use within 1A)
Input voltage: 2 v ~ 24 v
Maximum output voltage:> 28 v (recommended for use within 26V)
Efficiency:> 93%
Size: 30mm * 17mm * 14mm (L * W * H)
This module is a step-up module, the output voltage is greater than the input voltage.
Peak current output current does not exceed 2A.
 
Note:
1. Input voltage should not exceed the maximum input voltage
2. Peak current output current does not exceed 2A
3. When the module output voltage can not be adjusted, always equal to the input voltage when the first 20 laps counterclockwise rotary potentiometer or more, then you can use the module properly regulate the voltage. Surge mode: potentiometer face chest, counterclockwise turn boost!
 
 
 

 
CJMCU-219 is a module with the I2C interface of zero drift and bi-directional current/power monitoring and control integrated circuit (IC), further expand the TI energy-saving electronic products.INA219 has the industry's highest precision and the small size, not only can monitor the pressure drop on the shunt resistor, sensing shunt power supply voltage, at the same time also can calculate the power.The device adopts the SOT23 packaging, but for the server, notebook computer, power supply, battery management and digital electric vehicle and telecommunication equipment measuring flu provide small, low cost solution.
 
INA219-40 c to 85 c temperature range and can realize the maximum error of 1% accuracy, maximum offset of 100 uV.The advantage of the high precision of the product in combination with 12 resolution, can help clients as much as possible, reduce the pressure drop on the shunt resistor, which can minimize the power loss and power consumption, and saving board space.The device epic of 26 bus voltage range of 0 V to 26 V.
 
INA219 other important features include:
Calibration programmable registers can directly read its unit of measure is the ampere current, and power in watts per read. For as many as 128 sampling averaging, in order to realize filter in noise environment. The I2C interface has a timeout, not only can avoid the bus lock, but also can provide high-speed mode, meet the communication requirements of up to 3.4 MHz. All features are support software programmable INA219. Using single power supply, the working voltage between 3.0 to 5.5 V.
 
 

 
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: 1 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:
1 x Capacitive Soil Moisture Sensor
1 x Analog Sensor Cable
 

 
The properties of the lithium battery protection board:
Model: HX-3S-03
Overcharge voltage range: 4.25-4.35v±0.05v
Size: 30*30*2.8mm
Over-discharge voltage range: 2.3-3.0v±0.05v
Upper limit working current: 6-8A
Working temperature: -40--- 50 °C
Upper limit instantaneous current: 9-10A
Storage conditions: -40-- 80 ° C
Quiescent current: less than 30uA
Effective life: more than 30,000 hours
Internal resistance: less than 100mΩ
Short circuit protection: protection, delay self-recovery.
Charging voltage: 12.6V-13V

 
10PCS ULN2003AN DIP16 ULN2003A DIP-16 ULN2003 ULN2003APG DIP new and original IC

be used for multimeter, converted to lithium battery charging
 
For example: VIN Port input 5V solar panels, BAT port can output 4.2V to charger 3.7V 18650 battery
Note: The OUT Port can output an adjustable voltage.
 
Specifications:
Input voltage: 4.5-8V DC
Output voltage: 4.3-27V DC (Continuously adjustable)
Charging voltage: 4.2V DC
Charging current: Max. 1A
Discharging current: Max. 2A
Size: 3.3x2.3cm/1.3x0.91"

 
Description
ME-BME280 is a Breakout Board featuring a Bosch Sensortec ME280 Temperature, Humidity & Pressure Sensor. 
The board has selectable I2C address jumper (solder link GS2), I2C pull-up resistors, 7 pin header 2.54mm, and two mounting holes 3.5mm.
Default setting of the board; single power rail Vdd=Vdd_IO (solder link GS1), pull-ups resistors (R2, R3) 10k, protocol selector resistor 0ohm (R1), decoupling capacitors 0.1uF on both power supply pins Vdd & Vdd_IO.
If you connect board to both power rails VDD_IO 1.8V and VDD 3.3V be sure to remove the power rail jumper GS1!
 
BME280 Features
- Package 2.5 mm x 2.5 mm x 0.93 mm metal lid LGA
- Digital interface I2C (up to 3.4 MHz) and SPI (3 and 4 wire, up to 10 MHz)
- Supply voltage VDD main supply voltage range: 1.71 V to 3.6 V
   VDDIO interface voltage range: 1.2 V to 3.6 V
- Current consumption 1.8 uA @ 1 Hz humidity and temperature
   2.8 uA @ 1 Hz pressure and temperature
   3.6 uA @ 1 Hz humidity, pressure and temperature
   0.1 uA in sleep mode
- Operating range -40… 85 C, 0…100 % rel. humidity, 300…1100 hPa- Humidity sensor and pressure sensor can be independently enabled/disabled
 
 
Bosch has stepped up their game with their new BMP280 sensor, an environmental sensor with temperature, barometric pressure that is the next generation upgrade to the BMP085/BMP180/BMP183. This sensor is great for all sorts of weather sensing and can even be used in both I2C and SPI!
 
This precision sensor from Bosch is the best low-cost, precision sensing solution for measuring barometric pressure with ±1 hPa absolute accuraccy, and temperature with ±1.0°C accuracy. Because pressure changes with altitude, and the pressure measurements are so good, you can also use it as an altimeter with  ±1 meter accuracy
 
The BME280 is the next-generation of sensors from Bosch, and is the upgrade to the BMP085/BMP180/BMP183 - with a low altitude noise of 0.25m and the same fast conversion time. It has the same specifications, but can use either I2C or SPI. For simple easy wiring, go with I2C. If you want to connect a bunch of sensors without worrying about I2C address collisions, go with SPI.
 
Description
ME-BME280 is a Breakout Board featuring a Bosch Sensortec ME280 Temperature, Humidity & Pressure Sensor. 
The board has selectable I2C address jumper (solder link GS2), I2C pull-up resistors, 7 pin header 2.54mm, and two mounting holes 3.5mm.
Default setting of the board; single power rail Vdd=Vdd_IO (solder link GS1), pull-ups resistors (R2, R3) 10k, protocol selector resistor 0ohm (R1), decoupling capacitors 0.1uF on both power supply pins Vdd & Vdd_IO.
If you connect board to both power rails VDD_IO 1.8V and VDD 3.3V be sure to remove the power rail jumper GS1!
 
BME280 Features
- Package 2.5 mm x 2.5 mm x 0.93 mm metal lid LGA
- Digital interface I2C (up to 3.4 MHz) and SPI (3 and 4 wire, up to 10 MHz)
- Supply voltage VDD main supply voltage range: 1.71 V to 3.6 V
   VDDIO interface voltage range: 1.2 V to 3.6 V
- Current consumption 1.8 uA @ 1 Hz humidity and temperature
   2.8 uA @ 1 Hz pressure and temperature
   3.6 uA @ 1 Hz humidity, pressure and temperature
   0.1 uA in sleep mode
- Operating range -40… 85 C, 0…100 % rel. humidity, 300…1100 hPa- Humidity sensor and pressure sensor can be independently enabled/disabled
 
 
Bosch has stepped up their game with their new BMP280 sensor, an environmental sensor with temperature, barometric pressure that is the next generation upgrade to the BMP085/BMP180/BMP183. This sensor is great for all sorts of weather sensing and can even be used in both I2C and SPI!
 
This precision sensor from Bosch is the best low-cost, precision sensing solution for measuring barometric pressure with ±1 hPa absolute accuraccy, and temperature with ±1.0°C accuracy. Because pressure changes with altitude, and the pressure measurements are so good, you can also use it as an altimeter with  ±1 meter accuracy
 
The BME280 is the next-generation of sensors from Bosch, and is the upgrade to the BMP085/BMP180/BMP183 - with a low altitude noise of 0.25m and the same fast conversion time. It has the same specifications, but can use either I2C or SPI. For simple easy wiring, go with I2C. If you want to connect a bunch of sensors without worrying about I2C address collisions, go with SPI.

Technical parameters:
1. 14 digital input/output port RX and TX, D2 ~ D13,
2. 8 analog input port A0 ~ A7
3. 1 to the TTL level a serial port to send and receive port RX/TX
4.6 a PWM port, D3, D5, D6, D9, D10, D11
5. Using Atmel Atmega328P - AU microcontroller
6. Support serial download
7. Support external 3.3 V ~ 12 V dc power supply
8. Support 9 v batteries
9. 16MHz/8MHz clock frequency
10. Size: 33.3 *18 (mm)

Features:
Input: 7-24V
Max Current: 1A
Shipping list:
1.WEMOS DC Power Shiled  x1PCS
2. Pins  x2PCS
3. Connector  x1PCS
 
 

Product introduction: The INMP441 is a high performance, low power, digital output, omnidirectional MEMS microphone with bottom port. The The complete INMP441 solution consists of a MEMS sensor, signal conditioning, analog to digital converter, anti-aliasing filter, power management and industry standard 24-bit I2S interface. The I2S interface allows the INMP441 to be directly connected to digital processors such as DSPs and microcontrollers without the need for an audio codec for use in the system. The INMP441 has a high signal-to-noise ratio and is an excellent choice for near field applications. The INMP441 has a flat wideband frequency response that results in high definition of natural sound. Product Features: 1. Digital I2S interface with high precision 24-bit data 2. High signal to noise ratio is 61 dBA 3. High sensitivity - 26 dBFS 4. Stable frequency response from 60 Hz to 15 kHz 5. Low power consumption: low current consumption 1.4 mA 6. High PSR: -75 dBFS Interface definition: SCK: Serial data clock for I2S interface WS: Serial data word selection for I2S interface L/R: Left/Right channel selection. When set to low, the microphone outputs a signal on the left channel of the I2S frame. When set to high level, the microphone outputs signals on the right channel SD: Serial data output of the I2S interface. VCC: Input power, 1.8V to 3.3V. GND: power ground This product provides tutorials for using ESP32 modules with I2S functionality. Connect to ESP32: INMP441 ESP32 SCK >> GPIO14 SD >> GPIO32 WS >> GPIO15 L/R >> GND GND >> GND VDD >> VDD3.3 What is the difference between an omnidirectional microphone and a unidirectional microphone: First of all, I understand that the sound divergence is all-round. One person speaks and diverge in the air. As for how far it can pass, it depends on many factors. 1.directional microphone, the general pickup radius is very small, 30 cm is a big one, single use, put it on the mouth, the sound quality is very good, because it is not picked up again. The shape is generally goose neck wheat, a rod, a curved rod, to your mouth, directivity, just listen to your voice. With a single-point microphone, the sensitivity is limited to a certain range. Sensitivity is too high, causing sharp whistling, etc., involving many other devices As for why not make a big pickup radius, there is a reason. Later 2.omnidirectional microphone, the general pickup radius is very large, one meter two meters three meters five meters have, compared with ten centimeters, this level is very different, it is not just picking a person's voice, but Multiple people, five six, seven eight or even ten. Omnidirectional microphones are highly sensitive, The omnidirectional microphone pickup radius is too large, and it will also pick up more ambient noise, so the sound quality is not as good as the single-point microphone, unless you do a good noise reduction. There is definitely a difference between collective use and single-person service. But omnidirectional wheat has a benefit, the wiring is simple, not one by one. Suitable for small meetings, ad hoc meetings, some remote discussions, remote operations. 3.single-point wheat generally supports local amplification, Omnidirectional microphones generally do not support local amplification. It should be noted that because of such high sensitivity, the local amplification whistling is very scary, and the current technology is difficult to deal with.

Transmitter head and receiver template Product specifications and operating instructions
Receiver module parameters
Product Model: MX-RM-5V
Operating voltage : DC5V                quiescent current: 4MA
Receiving frequency: 433.92MHZ
Receiver sensitivity: - 105DB
Size : 30 * 14 * 7mm   external antenna: 32CM single core wire wound into a spiral
Technical parameters of the transmitter head
Product Model: MX-FS
Launch distance: 20-200 meters(different voltage, different results)    Operating voltage: 3.5-12V     Dimensions: 19 * 19mm
Ways of working: AM                transfer rate: 4KB / S          transmit power: 10mW
Transmitting frequency: 433M
An external antenna: 25cm ordinary multi-core or single-core line
Pinout from left → right: ( DATA ; VCC ; GND )
Application environment
Remote control switch, receiver module, motorcycles, automobile anti-theft products, home security products, electric doors, shutter doors, windows, remote control socket, remote control LED, remote audio remote control electric doors, garage door remote control, remote control retractable doors, remote volume gate, pan doors, remote control door opener, door closing device control system, remote control curtains, alarm host, alarm, remote control motorcycle remote control electric cars, remote control MP3 .

Input voltage: AC110-220V Output voltage: DC5V/12V Output current: 100mA/500mA Output power: 0.5W/6W Product size: 35*25*15mm Pad pitch: input 15.24 / output 5.08 (mm) Power input connection: AC110V-220V Dual outputs, 5V and 12V, respectively, can be connected to the output voltage matching load. Note: distinguish between the positive and negative poles of the power supply (as shown in the connection diagram)

Product Overview:
The DC-DC module based on LM2596 advocate current to 3.0A, but only to 1.8A.However, being introduced module adds a heatsink, using high-power devices.This module can easily reach 4A, 50W, add heat sink circumstances can reach 75W, has a high price!!
Module highlights: 5A high power ,high efficiency and low ripple with power indicator !!!
1. Input voltage range:4~38VDC(Note:input voltage not exceeding 38V)
2. Output voltage range:1.25-36VDC adjustable
3. Output current: 0-5A, recommended for use in 4.5A.
4. Output power: 75W
5.Working temperature: -40~ 85 degrees
6.Operating frequency: 180KHz
7.Efficiency:96% (max)
8.Short circuit protection: yes(limit current 8A).
9.Over temperature protection
10.Input reverse polarity protection: None (if required, high current diode in series with the input).
11.L x W x H = 54 * 23 * 18mm
Application:
The DC/DC buck module applications the input voltage is higher than the output voltage of the buck field, such as battery, power transformer, DIY adjustable regulated power supply, 24V Vehicle notebook power supply,industrial equipment buck.12V buck to 3.3V, 12V buck to 5V,  24V buck to 5V,24V buck to 12V,  36V buck to 24V etc.

 
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! 
 
 
 

Bt201 Dual Mode 5.0 Bluetooth Lossless Audio Power Amplifier Board Module Tf Card U Disk Ble Spp Serial Port Transparent Trans Function introduction: 1. Support Bluetooth audio, BLE data transmission, U disk playback, TF card playback. Support MP3/WAV/FLAC/APE format decoding 2. Optional: Serial AT command control. Support to modify the baud rate. Modify Bluetooth name, specify device playback, and mobile data passthrough 3. Support BLE and SPP dual-mode data transparent transmission, colleagues can also broadcast Bluetooth audio, no conflict 4. Support Bluetooth call, multi-button control. The last song, the next song. play / Pause. Adjust the volume and other simple functions. 5. Support to get the full file name of the play. Serial port specified path to play, loop or single play 6. Support 128KBS recording function, TF card or U disk. Recording delete playback, etc. 7. Rich usage information, reference PCB, use video tutorial, mobile phone transparent video tutorial. Serial AT video tutorial 8. Easily dock existing apps, or develop WeChat applets to implement mobile phone control Color: green

 

b

 
100PCS do-35 1N4148 IN4148 High-speed switching diodes
 
 

 
Embed version of Mega 2560 CH340G/ATmega2560 - compatible with Arduino Mega 2560 board. Built on the Atmel ATmega2560 microcontroller and USB-UART interface chip CH340G.
Board have compact size 38x55mm. It is good solution, to make your final project on solder proto-board.
Board for functionality similar to the Arduino Mega 2560. It is embed board, but the same stable, and uses the original chips ATmega2560 (16 MHz).
The board used the chip CH340G as converter UART-USB. When you work in the frequency 12Mhz, giving a stable result of data exchange (need install drivers to computer).
Mega PRO (Embed) 2560 CH340G / ATmega2560 - connects to the computer via microUSB cable (used for almost all Android smartphones).
You can supply power to board through the MicroUSB connector or to power pinheaders. The voltage regulator (LDO) can deal with incoming voltage from 6V to 9V (peack 18V) DC. Output current for 5V - about 800mA, for 3.3V - about 800mA (Please note that the higher the input voltage the lower the outgoing current). That will provide a reliable power most of your initial projects. 
 

 
 

AT-09 Android IOS BLE 4.0 Bluetooth module for arduino CC2540 CC2541 Serial Wireless Module compatible HM-10
 

The WeMos D1 mini is minimal ESP8266 wifi board.
11 digital input/output pins, all pins have interrupt/pwm/I2C/one-wire supported(except D0)
1 analog input(3.2V max input)
a Micro USB connection
Compatible with Arduino
Compatible with nodemcu
lots of Shields

10PCS IRF4905 IRF4905PBF TO-220

 

 

Product Introduction:
1.Operating Voltage: 5V
2.Pulse Number for One Circle: 20
3.Rotary encoder can count the output pulse times by rotating positively and negatively. This counting method has no limitation, it can reset and come back to the  initial status if matching with the key on the encoder (that is to say it will count from 0)
4.Operating Principle: Incremental encoder is a kind of rotary sensor which transforms the rotation displacement into a series of digital pulse signal. These pulses are used to control angular displacement. In Eltra encoder, the transformation of angular displacement adopts photoelectric scaning principle. The reading system is based on the radial dividing plate's rotation of alternative light window and non-light window, and it will be exposed to infrared light source at the same time. The light will reflect the picture of plate on the surface of receiver. The receiver is covered by a diffraction grating, and it has the same window width with the plate. The operation of receiver is to detect the change of light plate rotation, then transform the light change into electric change. Increase the low level signal into high level and generate square pulse without any interference. This process needs circuit to deal with. The reading system usually adopts differential method, that is compare two different signals who have the same waveform bu the phase difference is 180 degree so as to improve the output signal quality and stability. Reading is formed on the basis of the difference between two signals, so it eliminates the interference.

Product model:0.5/0.6/0.7/0.8/0.9/1/1.1/1.2/1.4/1.5
 
 

Product Introduction:
1.Name:12V charger power control board
2.Model:XH-M601
3.Power Supply Voltage:13.8-14.8V
4.Relay Operating Voltage:12.4V
5.Relay Disconnect Voltage:14.8V
6.Voltage Tolerance: /-0.1V
7.Voltage Detection Way:DC voltmeter
8.Charging Type:12V storage battery
9.Potentiometer Adjustment:RP1 RP2
10.Size:50*32*18mm
Potentiometer Adjustment:
1.RP1:adjust storage battery start charging voltage (low voltage setting:clockwise becomes higher,counter-clockwise becomes lower)
2.RP2:adjust storage battery disconnect charging voltage (low voltage setting:clockwise becomes higher,counter-clockwise becomes lower)

0.28 Inch 2.5V-40V Mini Digital Voltmeter Voltage Tester Meter Red/Blue/yellow/green LED Screen Electronic Parts Accessories

RCWL-0516 microwave radar sensor module Human body induction switch module Intelligent sensor

 
N:4.5-28V
OUT:0.8-20V   3A(MAX)
SIZE:22mm * 17mm * 4mm(Ultra-small)
 
 

 
DS3231 is a low-cost, extremely accurate I2C real-time clock (RTC), with an integrated temperature-compensated crystal oscillator (TCXO) and crystal. The device incorporates a battery input, disconnect the main power supply and maintains accurate timekeeping. Integrated oscillator improve long-term accuracy of the device and reduces the number of components of the production line. The DS3231 is available in commercial and industrial temperature ranges, using a 16-pin 300mil SO package.
RTC maintains seconds, minutes, hours, day, date, month, and year information. Less than 31 days of the month, the end date will be automatically adjusted, including corrections for leap year. The clock operates in either the 24 hours or band / AM / PM indication of the 12-hour format. Provides two configurable alarm clock and a calendar can be set to a square wave output. Address and data are transferred serially through an I2C bidirectional bus.
A precision temperature-compensated voltage reference and comparator circuit monitors the status of VCC to detect power failures, provide a reset output, and if necessary, automatically switch to the backup power supply. In addition, / RST pin is monitored as generating μP reset manually.
Save time and high precision addition, DS3231 also has some other features that extend the system host of additional features and a range of options. The device integrates a very precise digital temperature sensor, through the I2C * interface to access it (as the same time). This temperature sensor accuracy is ± 3 . On-chip power supply control circuit can automatically detect and manage the main and standby power (i.e., low-voltage battery) to switch between the power supply. If the main power failure, the device can continue to provide accurate timing and temperature, performance is not affected. When the main power re-power or voltage value returns to within the allowable range, the on-chip reset function can be used to restart the system microprocessor.
 
Module parameters:
1. Size: 38mm (length) * 22mm (W) * 14mm (height)
2. Weight: 8g
3. Operating voltage :3.3 - 5 .5 V
4. Clock chip: high-precision clock chip DS3231
5. Clock Accuracy :0-40 range, the accuracy 2ppm, the error was about 1 minute
6. Calendar alarm clock with two
7. Programmable square-wave output
8. Real time clock generator seconds, minutes, hours, day, date, month and year timing and provide valid until the year 2100 leap year compensation
9. Chip temperature sensor comes with an accuracy of ± 3
10. Memory chips: AT24C32 (storage capacity 32K)
11. IIC bus interface, the maximum transmission speed of 400KHz (working voltage of 5V)
12. Can be cascaded with other IIC device, 24C32 addresses can be shorted A0/A1/A2 modify default address is 0x57
13. With rechargeable battery LIR2032, to ensure the system after power failure, the clock move any natural normal
14. Packing: single anti-static packaging
 
Wiring instructions ( for Arduino uno r3 for example):
SCL → A5
SDA → A4
VCC → 5V
GND → GND
​

This is the mobile power module Accessories, 18650 Circuit board shell.
Meet the individual needs of your DIY, but you must understand basic electronic assembly.
Motherboard comes with protection function: Charging overcharge protection, over-discharge protection, overcurrent protection.
Intelligent output device after charging full, automatically stop charging, to prevent mobile phones overcharge.
Output voltage and current stable, will not harm user devices.
Specifications:
Micro USB input: 5V 1A
USB Output: 5V 2.1A / 5V 1A(Dual USB interface)
Charging display: intelligent digital display
Batteries Type: liquid lithium-ion batteries (18650)
Product Size: 57mm x 28mm
Screen size:27mm x 17mm
Installation instructions:
The circuit board is connected to the battery negative B-, B is the positive, do not connecting reversed, connecting reversed will burn the board, the battery is connected in parallel welding, assembling battery. Note that the insulation between the battery and the circuit board, battery lead not to touch the circuit board, so as not to cause a short circuit.
Package included:
1 x Mobile Power Bank 18650 Battery Charger PCB

Model Name:Mini-360 (ultra small size DC-DC synchronous rectifier buck module)
Module Properties:non-isolated buck
Rectification:synchronous rectification
Input voltage:4.75V-23V
Output voltage:1.0V-17V
Output Current:lowering the value of 3A, long 1.8A
Conversion efficiency:96% (maximum)
Switching Frequency:340KHz
Output ripple:30mV (no-load)
Load regulation:± 0.5%
Voltage regulation:± 2.5%
Working temperature:-40 Celsius to 85 Celsius
Features:Use integrally molded power inductor and synchronous rectifier control chip, smaller and more efficient

Description:This is the  RGB and Gesture Sensor, a small breakout board with a built in APDS-9960 sensor that offers ambient light and color measuring, proximity detection, and touchless gesture sensing. With this RGB and Gesture Sensor you will be able to control a computer, microcontroller, robot, and more with a simple swipe of your hand! This is, in fact, the same sensor that the Samsung Galaxy S5 uses and is probably one of the best gesture sensors on the market for the price.
The APDS-9960 is a serious little piece of hardware with built in UV and IR blocking filters, four separate diodes sensitive to different directions, and an I2C compatible interface. For your convenience we have broken out the following pins: VL (optional power to IR LED), GND (Ground), VCC (power to APDS-9960 sensor), SDA (I2C data), SCL (I2C clock), and INT (interrupt). Each APDS-9960 also has a detection range of 4 to 8 inches (10 to 20 cm).

Parameters
1, outer diameter 26mm, large diameter 28.5mm, high 26MM (plus light ball)
2, working voltage: DC5V
3. Communication interface: I2C
4, input light range: 1-65535lx
5, spectral sensitivity characteristics: peak sensitivity wavelength typical value: 560nm
6. Light source dependence is weak: incandescent lamp, fluorescent lamp, halogen lamp, white LED, fluorescent lamp

Description:
ADXL345 is a small, thin, low-power three-axis accelerometer can be high
Up to ± 16 g accelerometer with high resolution (13) measurements. Digital Outputs
According to a 16-bit twos complement format, can be accessed through the digital interface SPI (3-wire or 4-wire) or I2C.
ADXL345 is well suited for mobile device applications. It can tilt sensing applications
Measuring the static acceleration of gravity, it can also measure the dynamic add motion or shock caused
speed. Its high resolution (4 mg / LSB), capable of measuring about 0.25 ° of inclination
Angle change. Use ADXL345 digital output acceleration timing, etc., without the need for
Analog to digital conversion, reducing system cost and board space. In addition, ADXL345 is a small, thin, ultra-low power 3-axis accelerometer with high resolution (13-bit) measurement at up to ± 16g. Digital output data is 16-bit twos complement format, can be accessed via I2C digital interface SPI (3-wire or 4-wire) or.
ADXL345 is well suited for mobile device applications. It can tilt sensing applications
Measures the static acceleration of gravity, you can measure motion or shock resulting from moving
State acceleration. Its high resolution (3.9mg / LSB), capable of measuring less than 1.0 °
Tilt angle change.
The device offers a variety of special detection. Activity and inactivity sensing through
Comparing any axis acceleration threshold set by the user to detect the presence or absence of transport
Movable occurs. Tap any direction sensing detects single and dual vibration vibration
Make. Free-fall detection can detect whether the device is falling. These ones
Functions can be mapped to two interrupt output pins a. Shen is
Please patented integrated memory management system uses a 32 FIFO
(FIFO) buffer can be used to store data, which will host processor load
Minimize, and lower overall system power consumption.
Low power modes enable intelligent motion-based power management to a very low
Power consumption threshold sensing and active acceleration measurement.
Feature
Power supply: 3-5v
Communication: IIC / SPI communication protocol