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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 ofoutput 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.
Package Included: 
1pcs  X  LM2596S Module

Input voltage: DC12V to 25V
Output: 10.2V

Parameters: 2dB gain antenna and antenna adapter
The length of the line is about 14cm, and the total length of the single line is about 16cm
Name: 2.4G omnidirectional antenna
Frequency band: 2400-2500
Detailed indicators: electrical specifications
Frequency range (MHz) 2400-2500
Gain (DBI) ＞ 2.5
Standing wave ratio v.s.w.r. ＜ 1.5
Polarization vertical
Non circularity (DB) ± 0.5
Input impedance (Ω) 50
Lightning protection direct ground
Maximum input power (W) 50
Mechanical specifications
Connector type SMA
Radiating element material copper
Radome material EVA
Radome color gray
Antenna dimension (mm) 110 (unbend) 92 (bend)
Tail cable length (mm) 100 / 120 / 200
Packing size (mm) 295 × one hundred and ten × sixty
Weight Wight (kg) 0.009/12
Application condition editor
Operating temperature (℃) - 40 ~ 70
Storage temperature (℃) - 55 ~ 80

1pcs  -50~100 digital temperature controllear thermostat temperature control thermostat switch plate W1209

product manual:
Small size design, full-chip technology production, the input and output coupling capacitors use imported non-polar brand capacitors, and the op amp uses the original low-voltage power supply TDA1308
Patch. It can work within 3-6V to meet the needs of low-voltage power supply occasions.
Board size: 33*25*8mm (length * width * height)
Working voltage: DC 3-6V
Note: The board does not have a regulated power supply. It is best to use a bent voltage power supply or battery power supply when installing, otherwise there may be interference.
If you feel that the default magnification is not appropriate, you can change the magnification by yourself, as follows:
Magnification adjustment:
R7 and R5 are the magnification setting resistors. You can change the magnification according to your own needs. The resistance can be selected from 5K-47K. The larger the resistance, the higher the magnification. If you use plug-in resistors, you can remove the original chip resistors. Solder the plug-in resistance to the pads reserved at both ends of the patch position.

New L293D motor shield, the input voltage DC4.5-25V
600mA OUTPUT CURRENT CAPABILITY PER CHANNEL
1.2A PEAK OUTPUT CURRENT (non repetitive)PER CHANNEL
ENABLE FACILITY
OVERTEMPERATURE PROTECTION
LOGICAL "0" INPUT VOLTAGE UP TO 1.5 V(HIGH NOISE IMMUNITY)
INTERNAL CLAMP DIODES
The Device is a mnolithic integrated high voltage,high current four channel driver designed to accept standard DTL or TTL logic levels and drive inductive loads (such as relays solenoides, DC
and stepping motors) and switching power transistors .To simplify use as two bridges each pair of channels is equipped with an enable input. A separate supply input is provided for the logic, allowing operation at a lower voltage and internal clamp diodes are included. This device is suitable for use in switching applications at frequencies up to 5 kHz.

Size: about 56x33.5x12mm
upper operating current: 8A
upper transient current: 40A±5A
overcharge range: 4.25±0.05V
over disvoltage range: 2.5±0.05V
charging voltage：12.6-13V
function: over charge/ over discharge/short circuit/ over current protection

FUNCTIONS&FEATURES Lattice:128x64 Dots
LCD mode: FSTNnegativefull transparency,black film Viewing Direction:6 Oclock Drive Mode: 1/64 Duty1/9 Bias
LCM WorkingVoltage(VDD):3.3~5.0V LCD Drive Voltage VLCD(VOP): 9.0V Operating Temperature:-10℃~ 60℃ Storage Temperature:-20℃~ 70℃
Connectionmethod/driveIC:COG/ST7567 TZT Backlight(BL):2whiteLEDs(parallel)
(15mA/LED), If-30mA(Tye) VFE3.0V(Type
MECHANICAL SPECIFICATIONS
Outline Dimensions:42(L)x47.5(L)x13.65(H)(mm) ViewingArea:23.4(W)*36.00(L)(mm) Dot Pitch:0.32(W)*0.26(L)(mm) DotSize:0.29(W)*0.23(L)(mm)
EXTERNAL DIMENSIONS
Pin no. Symbol Function
1 CS Chip Select
2 RST Screen reset
3 AO Command/data
4 SCK Clock
5 SDA Data
6 GND Power negative
7 VDD Power positive
8 BLA Backlight positive
9 BLK Backlight negative

1. Volume: 23 * 24MM weight:0.45 g
 
2. Excellent noise suppression. in the absence of contact input audio, you will not hear any noise even put your ear close to the speaker
3. The two-channel stereo, 5V power supply can output 5W 5W power, directly drive 4, 8 speakers, output power, full of energy, good sound quality, with left and right channel volume adjustment.
 
4.unique non-LC filter Class-D digital power board, it can be used directly for the USB-powered from computers.
 
5. dual-panel wiring and proper solution to potential balance and channel crosstalk caused by the wiring between
 
6. ultra-miniature design, it can easily be placed in a small space inside a variety of digital products, high amplification efficiency.
 
7. Solder by machine
 
8. The rated working voltage 2.5-5V, limit operating voltage 5.5V

4x4 Matrix Keyboard Keypad Module Use Key PIC AVR Stamp Sml 4 * 4 Plastic Keys Switch

4x4 Matrix Keyboard Keypad Module Use Key PIC AVR Stamp Sml 4 * 4 Plastic Keys Switch

Model name

DC 5A High Current Buck power supply module
Module properties

Non-isolated Buck
Rectification mode

Non synchronous rectifier
Input voltage

5v-32v
Output voltage

0.8v-24v
Output current

Peak 5A (3.5A above work to enhance heat dissipation)
Conversion efficiency

Up to 90%
Switch frequency

300KHz
Output Ripple

30mV (no-load)
Load Adjustment Rate

± 0.5%
Voltage Adjustment Rate

± 2.5%
Working temperature

-40℃ to  85℃.
Peripheral dimensions

43*21*14 (long * wide * high) (mm)
Features: The use of high-power magnetic surround inductor and large current control chip, small size, large power, high efficiency.

Uses: light brightness detection, light brightness sensor, smart car light seeking module
 
Module features:
1, using sensitive photoresistor sensor
2, the comparator output, the signal is clean, the waveform is good, the driving ability is strong, more than 15mA.
3, with adjustable potentiometer can adjust the detection light brightness
4, working voltage 3.3V-5V
5, output form: DO digital switch output (0 and 1) and AO analog voltage output
6, with fixed bolt holes for easy installation
7, small board PCB size: 32mm x 14mm
8, using a wide voltage LM393 comparator
 
Module instructions
1, the photoresistor module is most sensitive to ambient light, generally used to detect the brightness of the surrounding environment, triggering a single-chip or relay module;
2. When the brightness of the ambient light reaches the set threshold, the DO end outputs a high level. When the ambient light brightness exceeds the set threshold, the DO end outputs a low level;
3. The DO output terminal can be directly connected to the single-chip microcomputer, and the high-low level is detected by the single-chip microcomputer, thereby detecting the change of the light brightness of the environment;
4. The DO output terminal can directly drive the relay module of the store, which can form a light control switch.
5, the small board analog output AO can be connected with the AD module, through the AD conversion, you can get more accurate values ​​of ambient light intensity;
 
Single chip test program
 
/******************************************
Shenzhen Xintai Microelectronics
Sensor trigger test
Single chip microcomputer: STC89C52
Baud rate: 9600
Product use: light detection.
*****************************************/
#include
Unsigned char date;
#define uchar unsigned char
#define uint unsigned int
Sbit key1=P0^1;
 
/* Function declaration ---------------------------------------------- -*/
Void delay(uint z);
Void Initial_com(void);
 
//************************************************ ***********
 
/*
************************************************** ******************************
** Function name : delay(uint z)
** Function: Delay function
************************************************** ******************************
*/
Void delay(uint z)
{
Uint i,j;
For(i=z;i>0;i--)
For(j=110;j>0;j--);
}
 
 
//******************************
 
//*****Serial port initialization function***********
 
//******************************
Void Initial_com(void)
{
EA=1; //open total interruption
ES=1; //Allow serial port interrupt
ET1=1; //Allow interrupt of timer T1
TMOD=0x20; //Timer T1, the baud rate is generated in mode 2 interrupt
PCON=0x00; //SMOD=0
SCON=0x50; // mode 1 is controlled by timer
TH1=0xfd; //the baud rate is set to 9600
TL1=0xfd;
TR1=1; //Open timer T1 run control bit
 
}
 
//*************************
//********** main function *********
//*************************
Main()
{
Initial_com();
While(1)
{
 
If(key1==0)
{
Delay(); //Debounce
If(key1==0) //confirm trigger
{
SBUF=0X01;
Delay(200);
}
}
If(RI)
{
Date=SBUF; //The microcontroller accepts
SBUF=date; //SCM sends
RI=0;
}
}
}

Input voltage: 4.5-50V,
the volume of L 40 * W 21.5 * H 13.5mm (including potentiometers).
Input: IN input positive IN- input negative
Output: OUT output positive OUT- output negative
Adjustment method: first correct input power (between 4.5-50V) then multimeter to monitor the output voltage and adjust potentiometer (usually clockwise turn boost, buck turn counterclockwise),
Output voltage: (3-35V) continuously adjustable (recommended load debugging).
Minimum pressure: 1.5V
Output current: rated current 2A, 3A maximum
Output Power: 15W maximum
Conversion efficiency: up to 92% (output voltage, the higher the efficiency)
Static power consumption is only about 6mA.
Connection: Welding, plus pin can be directly soldered after the PCB.
Operating temperature: Industrial grade (-40 to 85 degrees Celsius)
Load regulation: ± 1%
Voltage Regulation: ± 0.5% (mean time to achieve no-load output voltage will be higher, but as long as there is with 1MA load, the output voltage will be normal, does not affect the functionality, ease of use.)
Short circuit protection: current limiting, thermal protection, self-recovery.

100% high quality and branded 18650 Dual Micro USB 3.7V to 5V 2A Boost Mobile Power Bank DIY 
18650 Lithium li-ion battery dual micro usb booster board feature
LED lights show the power, non-working state of intelligent automatic shutdown;
Dual USB output. 
Built-in lithium battery protection IC, over-current, overvoltage, undervoltage protection;
18650 Lithium li-ion battery dual micro usb booster board parameter
Input port: MicroUSB (Andrews mouth)
Input requirements: 5V constant voltage power supply can be done to charge the input power supply, the most matching charger for 5V1A above
Output port: USB
Output parameters: 5V1A/5V2A 
Size : 8 X 32 X 69 mm (H*W*L)
18650 Lithium li-ion battery dual micro usb booster board requirements for rechargeable batteries:
Available battery: 18650 battery, cell phone battery, flat battery, MP3 battery, etc. 3.7V-4.2V polymer lithium battery can be single section (chip) power supply, can also be multi-section (chip) parallel power supply (not in series, not in series ). (Note: increase the capacity in parallel, the series is to increase the voltage, can only be used in parallel!)
Can be parallel 2-6 18650 battery.
Not available Battery: dry batteries, batteries, 1.2V rechargeable batteries, nickel-metal hydride batteries, 3.2V lithium iron polymer lithium batteries.
18650 Lithium li-ion battery dual micro usb booster board installation should pay attention to the following point
the battery should be in parallel, the voltage between 3.2-4.2V to work, 18650 flat and polymer batteries can be;
the battery is connected to the motherboard B negative access B-, installed anti-burning motherboard;
the old and new batteries, models, inconsistent battery brand can not be mixed.

The new product has been upgraded to version 5.0! Backwards compatible with 4.2 4.1 4.0
Support bluetooth 4.1 Mode, Support automatically back to even, Support to decode WAV/APE/FLAC/MP3 files losslessly, Support to      output stereo.
Parameters characteristics
Power Supply

3.7-5V
SNR

90dB
THD N

-70dB
Crosstalk

-86dB
DNR

91dB
Support Profile

A2DP/AVCTP/AVDTP/AVRCP/HFP
LOS

>15m
Functions and interfaces defination:
2.Interface details
USB powered

Universal Micro USB 5V power supply
3.7-5V Supply Pad

External 3.7-5V lithium battery power conversion
LED indicator

Bluetooth mode long blue light
3.5mm stereo audio interface

Standard 3.5mm interface, output stereo sound source, plug in headphones, connect amplifiers and other devices
Instructions:
After the power is turned on, the blue indicator lights up and enters the Bluetooth mode; the English “The bluetooth device is ready to pair” is displayed, indicating that the Bluetooth mode is entered and waiting for pairing; the “XY_BT” searched by the mobile phone Bluetooth is the device name of the decoding board. , Click on the connection, the decoder board prompts "The bluetooth device is connected successfully", indicating that the decoder board and the mobile phone are connected successfully, you can play music. As shown below Picture;

Specification:
Desktop speakers amplifier board, 2.0 stereo output, rated power 3W 3W,  98% of the market for desktop speakers, mini speakers.         
Product Name: 2.0 stereo amplifier board
Operating Voltage: AC 5-9V or DC 5-12V
Output Power: 3W 3W pick 2-10W 1-3 inch full-range speaker
Matching impedance: 4-16 Ohm
The circuit size: 39 x 52 x 25mm

DC Voltage:3-5V
electric current:100-200ma
Flow rate:70-120L/H

Features: 
The device can be used as a signal generator for electric speed controller (ESC), then you can test your motor system without using a transmitter and receiver. 
It can connect 1-3 servos simultaneously and test such as 1-3 servos consistency and so on. 
You can also connect 1-3 ESC to test and compare their reaction time respectively. 
It can connect 3 servos of the CCPM helicopters and select servos. 
It can also connect the servo of airplanes install the steering-box and adjust planes by using such as the neutral mode and so on. 
There are 3 modes to check servos or ESC: 
Manual mode: turn the knob with different speed, check the reaction time. 
Neutral mode: make the servo go back to the neutral point. 
Automatic "window wiper" mode: make the servo swing like a window wipers in the biggest angle. 
Specification: 
-Type: CCPM Servo Tester, ESC or Servo tester 
-Output: ≤15mA (5.0) 
-Voltage Consumption: DC4.8-6V 
-Output Signal: 1.5ms±0.5ms 
-Size: 48 x 42 x 17mm/1.89'' x 1.65 x 0.67''(Approx.) 
-Color: Blue 
Package Includes: 
1 Pcs Servo Tester

2020 new version update instructions:
Compared with the second version, the size is unchanged, the board circuit is optimized, and better components are replaced.
Added support for C-C data cable. The previous version only supported USB-C data cable.
Added support for the recognition of mainstream fast charging heads in the market. The fast smart charging head of the mobile phone can also be fully utilized.
Product name: 3A polymer ternary lithium battery fast charging board (note that it is not suitable for 3.2V lithium iron phosphate batteries)
Model: AILAVI-0503V3
Main control chip: IP2312
Input voltage: 4.5~5.5V
Charging cut-off voltage: 4.2V/4.35V (the output voltage is available in 2 versions)
Charging current: 3A (current can be changed by adjusting the resistance)
Indicator light: Yes, red: working indicator light. Blue: full indicator light. Note: This product does not have the power indicator function, and does not have the battery protection function. There are also lithium battery protection boards and power indicator boards for sale in this store.
Conversion efficiency: 3A 93% , 2A 94% , 1A 95% (data for reference only)
IP2312 adopts a complete CC/CV charging mode.
When the battery voltage is lower than 3V, it enters the trickle charging mode and charges the battery with a charging current of 100mA.
When the battery voltage is greater than 3V, it enters the constant current charging mode and charges the battery with the set constant current charging current.
When the battery voltage is close to 4.2V and the charging current is less than 300mA, it enters the constant voltage charging mode. After entering the constant voltage mode, stop charging every 4 minutes and check whether the battery voltage is higher than 4.15V: if it is higher than 4.15V, stop charging; otherwise, continue charging, and then check after another 4 minutes.
When the battery is fully charged, if it detects that the battery voltage is lower than 4.1V, it will start to charge the battery again.
Current adjustment instructions:
The default is 3A, remove the resistor 2A and replace it with a 135k resistor 1A

5A DC-DC Step Up Power Module Boost Volt Converter 3.3V-35V To 5V 6V 9V 12V 24V XL6019

No oscillation source,need square wave(frequency 2K-5K ) to drive
Audion 9012 drive;
Work Voltage:3.3-5V
Set bolt hole,easy to assemble
PCB Dimension:3.3cm*1.3cm
Pin Definition:
Pin

definition
Vcc

3.3~5V
GND

the Ground
I/O

I/O interface of SCM
Shipping list:
1PCS*Passive Buzzer Module for Arduino

3S 10A 12V Lithium Battery Charger Protection Board Module for 3pcs 18650 Li-ion Battery Cell Charging BMS 10.8V 11.1V 12.6V
Supply Voltage:12V
Operating temperature: -40~50 Celsius
Model Number:3S 10A Protection Board
Condition:New
Type:Voltage Regulator
Application:Electric Toy
Maximum discharge current: 10A
Overcharge detection voltage: 4.25-4.35V±0.05V
Over-discharge detection voltage: 2.3-3.0V±0.05V
Maximum working current: 5A-8A
Transient current: 9A-10A
Storage temperature: -40~80 Celsius
Quiescent current: Less than 6uA
Internal resistance: Less than 60mΩ
Service life: more than the 30,000 hours
Short circuit protection.
Overcharge protection.
Over-discharge protection.
Overcurrent protection.
Can be applied to various 3.7V lithium core.
Compact size and lightweight.
Fine workmanship and durable.
Ensure the security of battery pack.
Suitable for:
10.8V (Rated voltage of polymer battery)
11.1V (18650 or 3.7V lithium battery rated voltage)
12.6V (Lithium battery full charge voltage)
colour:Photo Color
material:PC metal
Size: approx.50x16x1mm
Package Contents:
1*3S 10A 12V Protection Board
Only the above package content, other products are not included.
Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is /- 1-3cm.

Specifications:
 
Features:
1.Easy to measure the USB output vollage and the device input current or loader voltage.
2.Availabe for every USB electronic product,such as PC USB,home charger,car charger and so on.
3.Plug and ,light and handy,easy to carry and no need external power.
4.Through "DR CHARGER",you could clearly know the condition of the charger
    ,phone,usb cable and every USB device.
 
Detection range:
 
Voltage:DC 3.5V-7V,error 0.1V
Current:0-3.0A,error 2%

Print USB CABLE 1.5M

Item Description:
3.3-5V Rain Raindrops Detection Sensor Weather Humidity Module For Arduino
Brand New
Feature:
1.The sensor USES the high quality FR - 04 double material, large area of 5.5 * 4.0CM, treatment of nickel plating and surface, have fight oxidation, electrical conductivity, and life has more superior performance;
2.With potentiometer sensitivity adjustment;
3.The output format: digital switch output (0 and 1) and analog AO voltage output;
4.Has a fixed bolt hole, convenient installation;
5.The comparator output, signal clean, good waveform, driving ability is strong, for more than 15 mA;
6.The LM393, use of wide voltage comparator;
7.The working voltage of 3.3 V to 5 V;
Size: Like the picture show
Usage:
- Connected to 5 v power supply power lights, no water droplets on induction plate, the DO output for the high level, switch lights out, a drop of water drops, the DO output for the low level, switch indicator,brush away the water droplets, return to again, the output high level state.
- AO analog output, can be connected to the microcontroller AD mouth drops of rainfall in the above size.
- DO TTL digital output can also be connected microcontroller detecting whether it will rain.
Package includes:
1 x Rain Sensor
1 x Rain Module
2 x Dupont Cables

Note that in this case, the "source" is not the power supply.It is the volatile source.
 
 
The characteristics of the passive buzzer is:
1 passive internal without shock source, so if use dc signal can't make it.Must use 2 k ~ 5 k square wave to drive it
For more than 2 sound frequency control, can make "m hair sola west" effect.
3 in some particular case, can reuse and LED a control
 
 
The characteristics of the active buzzer is:
1 Active buzzer inside with shock source, so as long as the electricity will call
2 Program control convenient, single chip microcomputer a high and low level can make the sound, and the passive buzzer is can't do.
Each weight is about 6 g
 
 
Module description
 
1 module driven by S8550 triode
 
2 working voltage of 3.3 V to 5 V
3 sets of fixed bolt hole, convenient installation
4 small board PCB size: 3.3 cm X 1.3 cm
 
 
2 Module interface specification (3 wire system)
1 VCC external 3.3 V to 5 V voltage (which can be directly connected to 5 V microcontroller and 3.3 V microcontroller)
2 GND external GND
3 I/O external microcontroller IO port
 
 
Three shipping list
 
 
1PCS X  Active buzzer module (Testing is completed)

Adopt LM386 amplifying chip, the magnification can be adjusted between 20 times and 200 times through the adjustable resistor on the board, suitable for electret microphone
Available in potentiometer and non-potential versions
With potentiometer can directly drive small power speakers: with potentiometer
Working voltage: DC 4v-12v
Board size: 20mm * 20mm

Capacitive type touch jog switch module The module is based on a touch detection IC (TTP223B)'s. Under normal conditions, the module output low, low-power mode to mode; touch of a finger when the corresponding position, the module will output high, the mode is switched to fast mode; when for 12 seconds without touching, the mode and switch to low power mode. Module can be installed in such as plastic, glass surface non-metallic materials, in addition to the thin paper (non-metallic) covering the surface of the module, as long as the correct location of the touch, you can make hidden in the walls, and other parts of the desktop button. This module allows you to remove the troubles of conventional push-type buttons.
Module features are as follows:
Jog type: the initial state is low, high touch, do not touch is low (similar touch of a button feature)
Low power consumption
Power supply for 2 ~ 5.5V DC
Touch surface can be used as positive and negative, can replace the traditional touch of a button
4 M2 screws positioning holes for easy installation
Control Interface: A total of three pins (GND, VCC, SIG), GND to ground, VCC is the power supply, SIG digital signal output pin;
Power Indicator: Green LED, power on the right that is shiny;
Touch area: Similar to a fingerprint icon inside the area, you can touch the trigger finger.
Positioning holes: 4 M2 screws positioning hole diameter is 2.2mm, the positioning of the module is easy to install, to achieve inter-module combination;

18650 battery box with cable Lithium battery 1 18650 battery box with cable 1 battery box series charging
Although the processing is complicated, I will not dare to save labor, and although the taste is expensive, I will not dare to reduce material resources
Space is compact! The battery can also be easily put in while wearing a protective plate. Easy to remove. Does not damage the battery.
Size 75.8*21.6*19
Model: Available from stock, high-quality 18650 boxes, 18650 battery boxes, 18650 lithium battery boxes, suitable for wearing protective plates
Material: PP soft rubber material
Hardware: none
Spring: Steel nickel plated
Rivets: Brass
Wire: 1007# 24AWG
Exposed wire length: 150mm
Colour: Black
External connection: two red and black wires with a length of 150mm. If you need special wires and other accessories, you can customize them according to customer needs. For details, contact the owner Wangwang.
Remarks: It can hold 1 18650 lithium battery. Can be screwed. screws not included

Soil Moisture Hygrometer Detection Humidity Sensor Module For arduino Development Board DIY Robot Smart Car
 
 
 
Disclaimer:
1 This is a summary of the moisture sensor can be used to detect the moisture of the soil, when the soil is dry , the module outputs a high level , whereas the output low. Using this sensor make an automatic watering system , so that your garden plants need people to manage .
 
2 adjustable sensitivity ( shown in blue digital potentiometer adjustment )
 
4 Operating Voltage 3.3V-5V
 
5 Module Dual Output mode , a simple digital output , analog output more accurate.
 
6 with fixed bolt hole for easy installation
 
7 small PCB board size : 3cm * 1.6cm
 
8 power indicator ( red ) and the digital switch output indicator ( green )
 
9 using LM393 comparator chip , stable
 
VCC external 3.3V-5V
GND GND External
DO small board digital output interfaces ( 0 and 1 )
AO small board analog output interface
Instructions
A soil moisture and humidity module most sensitive to the environment , usually used to detect soil moisture .
Modules in the soil moisture reach the set threshold , DO port output high when soil moisture exceeds a set threshold, the module D0 output low ;
Digital outputs D0 small plates can be directly connected with the microcontroller through the microcontroller to detect high and low , thereby detecting soil moisture ;
Small plates digital output DO OUR relay module can directly drive the buzzer module , which can be composed of a soil moisture alarm equipment ;
Small plates AO analog output modules can be connected and AD through the AD converter , you can get a more accurate value of soil moisture ;
Package Included:
 
1pcs X  Soli moisture sensors

Joystick Module：Y-023 5 pin 5V Dual Axis XY Thumb Game Joystick Module for Arduino PS2 Rocker
Feature:
2 potentiometers for 2 axes
1 switch
Connector:    5Vcc - GND - VRx - VRy – SW
Dimensions:   4 X 2.6 X 3.2CM
Package Included:
1 x XY Joystick Module
Dual Joystick Module：Electronic building blocks Dual PS2 game joystick button module JoyStick compatible with UNO R3
Joystick Shield：
direct plug puzzle board, NO soldering needed.
   Five momentary push buttons (4 joystick select button, just like the playstation 3 analog stick push button)
   two-axis thumb joystick
   specification: The push buttons are connected to digital pins 2-6; the related pin will be low when a certain button is pressed. Joystick
   Y-Axis movement will produce a proportional analog voltage on analog pin 0, while, Joystick X-Axis movement will produce a analog signal on analog pin 1.
   Add nRF24L01 RF interface
   With Nokia 5110 LCD interface, so very easy to game development.
   Adding a Bluetooth module interface, convenient Bluetooth wireless serial communication.
   Add I2C communication interface, easy connectivity to I2C devices
   Meanwhile, JoyStick Shield with a cross PS2 joystick with buttons, there are four round buttons, 2 small buttons. Provides for joystick and buttons input expansion. Onboard switches can switch between 3.3V and 5V, can use this model for other 3.3V microcontroller platforms, such as STM32.

Joystick Module：Y-023 5 pin 5V Dual Axis XY Thumb Game Joystick Module for Arduino PS2 Rocker
Feature:
2 potentiometers for 2 axes
1 switch
Connector:    5Vcc - GND - VRx - VRy – SW
Dimensions:   4 X 2.6 X 3.2CM
Package Included:
1 x XY Joystick Module
Dual Joystick Module：Electronic building blocks Dual PS2 game joystick button module JoyStick compatible with UNO R3
Joystick Shield：
direct plug puzzle board, NO soldering needed.
   Five momentary push buttons (4 joystick select button, just like the playstation 3 analog stick push button)
   two-axis thumb joystick
   specification: The push buttons are connected to digital pins 2-6; the related pin will be low when a certain button is pressed. Joystick
   Y-Axis movement will produce a proportional analog voltage on analog pin 0, while, Joystick X-Axis movement will produce a analog signal on analog pin 1.
   Add nRF24L01 RF interface
   With Nokia 5110 LCD interface, so very easy to game development.
   Adding a Bluetooth module interface, convenient Bluetooth wireless serial communication.
   Add I2C communication interface, easy connectivity to I2C devices
   Meanwhile, JoyStick Shield with a cross PS2 joystick with buttons, there are four round buttons, 2 small buttons. Provides for joystick and buttons input expansion. Onboard switches can switch between 3.3V and 5V, can use this model for other 3.3V microcontroller platforms, such as STM32.

Joystick Module：Y-023 5 pin 5V Dual Axis XY Thumb Game Joystick Module for Arduino PS2 Rocker
Feature:
2 potentiometers for 2 axes
1 switch
Connector:    5Vcc - GND - VRx - VRy – SW
Dimensions:   4 X 2.6 X 3.2CM
Package Included:
1 x XY Joystick Module
Dual Joystick Module：Electronic building blocks Dual PS2 game joystick button module JoyStick compatible with UNO R3
Joystick Shield：
direct plug puzzle board, NO soldering needed.
   Five momentary push buttons (4 joystick select button, just like the playstation 3 analog stick push button)
   two-axis thumb joystick
   specification: The push buttons are connected to digital pins 2-6; the related pin will be low when a certain button is pressed. Joystick
   Y-Axis movement will produce a proportional analog voltage on analog pin 0, while, Joystick X-Axis movement will produce a analog signal on analog pin 1.
   Add nRF24L01 RF interface
   With Nokia 5110 LCD interface, so very easy to game development.
   Adding a Bluetooth module interface, convenient Bluetooth wireless serial communication.
   Add I2C communication interface, easy connectivity to I2C devices
   Meanwhile, JoyStick Shield with a cross PS2 joystick with buttons, there are four round buttons, 2 small buttons. Provides for joystick and buttons input expansion. Onboard switches can switch between 3.3V and 5V, can use this model for other 3.3V microcontroller platforms, such as STM32.

Description:
1. Size:15*10mm
2. Working voltage:3.3V-6V
Package Included:
1X MAX9812L Board

Module Features:
Use imported groove coupler sensor
Groove Width: 5mm
Output state indicator lights
Obscured output high; unobstructed output low
The comparator output, the signal is clean, the waveform, driving ability, more than 15mA
Operating Voltage: 3.3V-5V
The output in the form: Digital switching outputs (0 and 1)
A fixed bolt hole for easy installation
Small plates PCB Dimensions: 3.2 x 1.4cm / 1.25 * 0.55"
Using a wide voltage LM393 comparator
Module Using The Instructions:
Module slot unobstructed, receiver tube conduction module DO output low, shelter, DO output high
Module DO connected to the relay, composed of the limit switch functions can also be connected to the active buzzer module, composed of the alarm
Package Included:
1 x Slot Type Optical Coupling Module

 
 
10pcs Line length 50cm Crocodile clip number 35mm 28mm Double-ended Crocodile Clips Cable Alligator Clips Wire Testing Wire Clip
 
Product information
1. Type: double-ended crocodile/alligator clips.      
     
2. Colour: multi-coloured (red, green, orange, white and black), as the picture shows.      
     
3. Cable length: About 50cm.      
     
4. Quantity:10pcs(1set).

Relay coil driving voltage is 5V, the control input level may be within 5V Module Description:
Output drive capability: 250VAC-10A, 125VAC-10A, 30VDC-10A, 28VDC-10A;Easy to use, each output line 3 simple structure, reserving six output terminals;IO input port directly connected to the microcontroller or a digital circuit, inputs a high level relay, the relay release input low;Working voltage of 5V, a current of about 70mA pull each channel, with relay status indicator;SMD components, the most reasonable driving circuit design, the relay driving transistor 8050;A fixing screw hole for easy installation.
Simple Test Description: input and output modules electrically insulated, the supply voltage on the corresponding right, just connect the high level at the input pin (such as the VCC short circuit) can make relay, connected or not connected low (such as short circuit and GND) relay does not operate.

Module highlights:
 
1. High power, high efficiency, 5A, low ripple;
 
2. Three in one:
 
(1) Used as a normal step-down module with overcurrent protection capability;
 
(2) Used as a charger for various voltage lithium batteries, batteries, nickel-cadmium nickel-hydrogen batteries (battery packs), for solar panels, wind turbines, etc.;
 
(3) used as a high power LED constant current drive module;
 
3. There are two modes of constant voltage and constant current, and there are indicators to indicate which mode the module is currently in;
 
4. When used as a lithium battery charger, you can set the float voltage and charge current.
 
Is it charging or already full;
 
5. With current limiting protection, the module will not burn out even if the output is short circuited.
 
 
 
First, the module parameters
 
Input voltage: 4-38V
 
Output voltage: 1.25-36V continuously adjustable
 
Output current: adjustable, up to 5A
 
Output power: up to 75W
 
Working temperature: -40~ 85 degrees
 
Working frequency: 180KHz
 
Conversion efficiency: up to 96%
 
Short circuit protection: Yes (limited current 8A)
 
Over temperature protection: Yes (automatically turn off the output after over temperature)
 
Input reverse connection protection: None, (If necessary, please input a large current diode in the input string)
 
Installation method: 4 3mm silk
 
Wiring method: terminal block or soldering terminal, V-IN is input, V-OUT is output
 
Module size: length 61.7mm width 26.2mm height 15mm
 
Weight: 25g
 
 
 
Second, the scope of application
 
1. Use as a normal buck module with overcurrent protection
 
Instructions:
 
(1) Adjust the constant voltage positioner so that the output voltage reaches the voltage you want.
 
 
 
(2) Use the multimeter 10A current file to measure the output short-circuit current (directly connect the two test leads to the output terminal), and adjust the constant current potentiometer to make the output current reach the predetermined overcurrent protection value. (For example, if the current value displayed by the multimeter is 4A, then the maximum current can only reach 4A when you use the module, and the red constant voltage constant current indicator will be on when the current reaches 4A, otherwise the indicator will be off)
 
Note: When using in this state, since the output has a current sampling resistor of 0.05 ohms, there will be a voltage drop of 0~0.3V after the load is connected. This is normal! This voltage drop is not pulled down by your load, but falls to the sampling resistor.
 
2. Use as a battery charger
 
Modules without constant current function cannot be used to charge the battery. Because the voltage difference between the battery and the charger that consumes electricity is too large, the charging current is too large, causing damage to the battery. Therefore, the battery should be used at the beginning. Stream charging, when the charging reaches a certain level, it automatically switches back to constant voltage charging.
 
Instructions:
 
(1) Determine the float voltage and charge current of the rechargeable battery you need; (If the lithium battery parameter is 3.7V/2200mAh, then the float voltage is 4.2V and the maximum charge current is 1C, ie 2200mA)
(2) Under no-load conditions, the multimeter measures the output voltage, and adjusts the constant voltage positioner to make the output voltage reach the float voltage; (If charging the 3.7V lithium battery, adjust the output voltage to 4.2V)
(3) Use the multimeter 10A current file to measure the output short-circuit current (directly connect the two test leads to the output terminal), and adjust the constant current potentiometer to make the output current reach the predetermined charging current value;
(4) The charging lamp current defaults to 0.1 times the charging current; (the battery is gradually reduced during the charging process, gradually changing from constant current charging to constant voltage charging, if the charging current is set to 1A, then when When the charging current is less than 0.1A, the blue light is off, the green light is on, and the battery is charged.
(5) Connect the battery and charge it.
 
(Steps 1, 2, 3, and 4 are: input terminal is connected to the power supply, and the output terminal is not connected to the battery.)
 
3. As a high power LED constant current drive module
 
(1) Determine the operating current and maximum operating voltage at which you need to drive the LEDs;
 
(2) Under no-load conditions, the multimeter measures the output voltage, and adjusts the constant voltage positioner to make the output voltage reach the maximum working voltage of the LED;
 
(3) Measure the output short-circuit current with the multimeter 10A current file, and adjust the constant current potentiometer to make the output current reach the predetermined LED operating current;
 
(4) Connect the LED and test the machine.
 
(Steps 1, 2, and 3 are: input is connected to the power supply, and the output is not connected to the LED.)
 
 
 
Note: When using this module over 3A, 35W, please strengthen the heat! ! !

1. Description:
This product is a stereo Bluetooth amplifier module. The Bluetooth version is 4.2.
 
2. Features:
1>. The version is 4.2. It can be compatible with all mobile phones and Bluetooth adapters on the market.
      2>. The distance is 15 meters in open space.
      3>. It supports automatically connecting devices that have been paired and playing music automatically.
      4>. F class power amplifier 5W 5W, high power output, over 8002 sound quality.
      5>. It supports USB sound card, no drive, plug and play.
      6>. Good sound quality, suitable for upgrading and refitting the idle sound box and DIY production.
 
3. Instructions:
      1>. Support USB sound card, free drive, plug and play (normal lithium battery power supply situation).
      2>. This product has dual 5W power amplifier circuit. It can not be used in addition to the power amplifier. The output of two amplifiers can not be connected in parallel or connected to the negative electrode, otherwise the power amplifier chip will be damaged.
      3>. There are two 2-8 European and 3-10W speakers respectively, and 3 European 5W and 4 European 10W horn are used. The output is stereo.
      4>. Maximum working current is 5V 2A, using 5V 2A or more voltage power supply, sound quality will be better.
      5>.It is suggested that a 3.7-5V lithium battery (the lithium battery needs a protective plate! It can charge a lithium battery with a USB rechargeable battery, and the USB port can not be used as a power supply port.) or a 5V adapter be used for power supply. It can not use voltage and current unstable power supply, such as dry battery, portable charger, multi-function transformer and so on.
      6>. When the Bluetooth board is installed, the antenna should not be close to the metal parts so as not to affect the transmission distance.
 
4. Operation:
      Start the cell phone Bluetooth, scan the device, find the "DW-CT14 " to click connection.
 
5. Note:
The charging interface of this product is a current limiting charging mode without charge management. For your safety, be sure to use a regular lithium-ion battery with a protective plate, which can cause loss due to improper use.
 
6. Package list:
Main board plug line