Breakout Boards
100Watt (15A) 60V to 19V/12V/9V/5V Variable DC-DC adjustable buck / Step down module


Module name: DC-DC synchronous rectification adjustable step-down module (with housing)

Input: 7V-60V

Output: 1-35V adjustable (maximum can not exceed 35V)

Efficiency: 96% (MAX)

Protection: short circuit protection, reverse connection protection (not connected to the board)

Module size: L70mm*W40mm*H30mm

Module weight: 77g

Working temperature: -40°C-+85°C

Load capacity: 15A (MAX)

Output power: natural heat dissipation 100W, enhanced heat dissipation 150W. 

2 Channel Relay Module made by ewallpk

This relay module is completely designed and manufactured by ewallpk,

The 2 channel 5V relay module provides 2 optically isolated inputs that accept a wide range of voltage, including the 3VDC and 5VDC signals available on the Arduino. This is a great way to switch on or off AC or DC loads using your Arduino.

The relays are single-pole-double-throw (SPDT) and are rated for 10A @ 250VAC. The ground for the relay coils is separate from the ground for the input signals. This, along with the optical isolation, provides a total galvanic isolation between the input and output. The two grounds could be joined together if desired with the included jumper.

The relay coils run on 5VDC, and the module has screw-terminal blocks for sturdy and reusable attachments for the external load. The signal and power inputs run through the male single-row header.

4 Channel Relay Module made by ewallpk

this is a 4 channel relay module completely designed and manufactured by ewallpk


Material: Mixed Material
Dimensions (cm): 7.7 x 5.5 x 2
Weight (kg): 0.063
Control signal: the TTL level

Rated load:
10A/ 28vDC

Rated by current: 10A (NO),5A (NC)
Largest switching voltage: 250vAC,30 VDC
Below contact action time: 10ms

Pin Definition:

1. 1-4 channel - control,
2. The power supply (VCC)
3. The ground (GND)

2A Dual, Power Bank Circuit with LCD battery Status display

Note: B+ and B- of the boosted battery must not be reversed.

Application: All 3.7-4.2V rechargeable lithium batteries, such as mobile phone battery flat battery 18650 battery and so on!

Can be connected to a lithium battery or parallel multi-cell lithium battery

Lithium battery positive electrode connected to B+      lithium battery negative electrode connected to B-


Note: B+ and B- of the boosted battery must not be reversed.

The first use requires a Micro USB port to activate once

Tips: This shop has a large number of lithium batteries for sale, you can buy them together! !

 Charging indication: the charging display will show the IN letter

Output load indication: long press the LED light button after the load is turned on, the output starts, the display will show the OUT letter and the relative output voltage and current 5V1A or 5V2.1A

Protection function: The protection circuit of the boosted lithium battery has been integrated to prevent over-discharge, over-charge and overload.

Note: B+ and B- of the boosted battery must not be reversed.

Can be connected to a lithium battery or parallel multi-cell lithium battery

Lithium battery positive electrode connected to B+ lithium battery negative electrode connected to B-


The first time you need to activate the Micro USB port, you will charge it for 1 minute before using it.

Passive Speaker Buzzer Module Sensor

Working voltage:3.5-5.5V
Working current:<25mA
PCB Dimension:18.5mm x 15mm(LxW)
Passive Buzzer Module Feature:

No oscillation source, need square wave (frequency 2K-5K ) to drive.
Sound frequency control, you can make a "do re mi fa sol la si" effect.
For ARDUINO reference source programme:

int buzzer=8;// Set the control the buzzer digital IO pin
void setup()
pinMode(buzzer,OUTPUT);// Setting the digital IO pin mode , OUTPUT is Wen out
void loop()
unsigned char i,j;// Define the variable
for(i=0;i<80;i++)// Wen a frequency sound
digitalWrite(buzzer,HIGH);// Sound
delay(1);//delay 1ms
digitalWrite(buzzer,LOW);//Not sound
delay(1);// delay 1ms
for(i=0;i<100;i++)// Wen out another frequency sound
digitalWrite(buzzer,HIGH);// Sound
delay(2);//delay 2ms
digitalWrite(buzzer,LOW);// Not sound
delay(2);//delay 2ms
After downloading the program, the buzzer experiments are finish.

Package Included:

1 X Passive Speaker Buzzer Module

MAX7219 EWG 8-Digit Digital Tube Display Control Module Red

MAX7219 is an integrated serial input / output common-cathode display drivers, which connects the microprocessor 7-segment digital LED display with 8 digits, you can also connect a bar graph displays or 64 independent LED. On which includes a B-type BCD encoder chip, multi-channel scanning loop, segment the word drive, but also an 8 * 8 static RAM for storing each data. Only one external register is used to set the segment current of each LED.

Display: 0.36" 4 digit led display 7 seg segment Common cathode Red
Power: 5V
Material: PCB + Electronic Components
Size: 82 * 15 * 18mm
Color: Red
Wiring instructions (for example, it can connect any IO port, modified the Port Definition in the program):

VCC → 5V


DIN → P00

CS → P01

CLK → P02

Package Included:
1 X MAX7219 Module
1 X 5P Straight Pin
1 X 5P Bent Pin

Gamepads JoyStick Keypad Shield for Arduino nRF24L01 Nk 5110 LCD I2C 3.3V Controller Board Module

nRF24L01 RF interface
for Nokia 5110 LCD interface
bluetooth interface
I2C interface
for one PS2 toystick
working voltage: 3.3V or 5V eg. STM32
Package includes:
1 x Gamepads Joystick Shield

LoRa32u4 II Lora Development Board Module LiPo Atmega328 SX1276 HPD13 868MHZ with Antenna

LoRa32u4 II is a light and low consumption board based on the Atmega32u4 and HPD13  868MHz LoRA module and an USB battery charging circuit. Ideal for creating long range wireless networks that can exceed 2.4 GHz 802.15.4 and similar, it is more flexible than Bluetooth LE, does not require high power unlike WiFi and offers long range.
The ATmega32u4 is clocked at 8 MHz and 3.3 V. This chip has 32 K of flash, 2 K of RAM and built-in USB to Serial communication, debugging and programming capabilities without the need for an external FTDI chip, it can also act as an HID device (mouse, keyboard, USB MIDI device, etc).
This board is also equipped with a LiPo and Liion charging circuit and a standard battery interface. It is fully compatible with Arduino. A white user led is tied to pin 13. An orange LED is used for charging status.

HPD13 wireless module, using high-performance, highly integrated RF transceiver chip SX1276 design. Advanced LoRaTM spread spectrum communication technology to ensure that the module communication distance and anti-jamming capability greatly improved, and also achieved a very low current consumption. In the LoRaTM mode, the HPD13 provides higher reception sensitivity performance, more robust anti-jamming capability, and improved communication distance and reliability compared to the same transmit and receive modules on the market. In normal (G) FSK mode, it also provides industry-specific receiver sensitivity, as well as very high communication rates.  

ATmega32u4 @ 8MHz with 3.3V logic/power
3.3V regulator with 500mA peak current output
USB native support, comes with USB bootloader and serial port debugging
Built in 100mA lipoly charger with charging status indicator LED
Reset button

Receive current: 10 ~ 14mA
Interface Type: SPI
Operating temperature: -40 ° C to + 85 ° C
Digital RSSI function
Automatic frequency correction
Automatic gain control
Radio wake-up function
Low voltage detection and temperature sensor
Fast wakeup with frequency hopping
Highly configurable packet handlers

Document link:

Package includes:
1 X LoRa32U4 II Lora Module development board

10PIN to 6PIN ISP Adapter Board Adapter Converter Board Module


1. the standard ATMEL ISP10 converted into standard ISP6

2. used to AT89S5x series microcontroller download interface switching

3. used to AVR series MCU download interface switching
4. Arduino firmware burn write interface switching

Package Included:

1 X 10PIN to 6PIN ISP Adapter Board

PCF8591 AD and DA Converter Module Analog to Digital and Digital to Analog Conversion Module


1. A module chip using PCF8591
2. module supports external voltage input capture (input voltage range 0-5v)
3. Three modules integrated photoresistor acquisition environment through the AD intensity accurate numerical
4. modules integrated thermistor, can capture the precise value of the ambient temperature through the AD
5. The five-module integrated 1 channel 0-5V voltage input acquisition (blue potentiometer to adjust the input voltage)
6. modules with power indicator light (on the module after power indicator lights)
7. modules with the DA output indicator light board DA output indicator module DA output interface voltage reaches a certain value, the voltage the greater the light brightness is more obvious;
8. module PCB size: 3.6cm * 2.3cm
9. standard double-sided, plate thickness 1.6mm, the layout is nice, surrounded by the through-hole, aperture: 3mm, convenient fixed

Performance indicators:
Single-Supply Operation
PCF8591 operating voltage range of 2.5V to 6V
Low standby current
Through the I2C bus serial input / output
PCF8591 by 3 hardware address pins addressing
Sampling rate PCF8591 I2C bus rate decided
4 analog inputs programmable as single-ended or differential inputs
Automatic incremental channel selection
PCF8591 analog voltage range from VSS to VDD
PCF8591 built-in track and hold circuit
8-bit successive approximation A / D converter
Through an analog output DAC gain

Module interface:

The module's left and right, respectively, the external expansion of 2-way pin interface, respectively, as follows:
Output interface of the left the AOUT chip DA
The AINO chip analog input interface.
AIN1 chip analog input interface
AIN2 chip analog input interface
AIN3 chip analog input interface
The right side of the SCL IIC clock interface to access the microcontroller IO port
The SDA IIC digital interface connected microcontroller IO port
GND module to an external
VCC power supply interface external 3.3v-5v
Module red jumper instructions for use
Module three red short circuit cap, respectively, the role are as follows:
P4 connected to the P4 jumper, select thermistor access circuit
P5 connected to P5 jumper to select the photoresistor access circuit
P6 connected to the P6 jumper, to select 0-5V adjustable voltage access circuit


Package Included:
1 X PCF8591 Module
4 X Dupond Cable

3W×2 Mini Digital Power Audio Amplifier Board

3W×2 Mini Digital Power Audio Amplifier Board USB DC 5V Power Supply PAM8403 for Arduino


Power supply: DC2.5-5.5 V
Output power: 3W + 3W (4Ω)
SNR: 90dB
Efficiency: > 90%
Size: 15.5×24 mm

Positive and negative power supply can not be reversed
Power supply voltage can not exceed 5.5V
On-chip high-gain buffer, please do not change any component parameters , or the IC will be damaged.
Please try to use the input line with shielded cable, you can play a role in immunity, eliminate clutter current sound.
BTL output cmos tube drive, can not be negative about the speaker together, that four lines connect the speaker is completely independent, does not allow total access

Package Content:
1 X Mini Digital Audio Amplifier Board

Wii Nunchuck Adapter WiiChuck For Arduino

Description :

The WiiChuck Adapter is a small PCB that is designed to be inserted into the connector of a Nintendo Wii Nunchuck to provide access to all 4 wires of the remote. The power, ground and two-wire interface of the Nunchuck are all broken out to a 4-pin 0.1" pitch header. Compared with standard WiiChuck, the DFRobot WiiChuck has extra 4 pins which allow you connect it to two devices.

The Wii Nunchuck is loaded with features -- a 2-axis joystick, 
two buttons and a 3 axis ±2g  accelerometer -- and any device capable of I2C can communicate with it! The WiiChuck allows you to interface with the Nunchuck without making a mess and cutting the wires.