ESP8266 D1 R2 V2.1.0 WIFI Dev Board (Arduino UNO Footprint)

The D1 R2 is a WIFI capable ESP8266EX based development board in the form of the Arduino UNO board format.

This board is compatible with the Arduino IDE and with NodeMCU. Tutorials for each can be found in the Resources section below.

The D1 R2 also features an on-board switching power supply which allows you to power the board from a power supply up to 12V.

We offer a board similar to this called the Wemos D1 Mini that is much smaller in size and breadboard compatible.

Note: The D1 R2 is a 3.3V device. If you connect it to 5V digital sensors or devices, you may need a logic-level converter such as our 4-channel or 8-channel logic-level converter modules.

Product Contents

• 1 - Wemos D1 R2 Version 2.1 ESP8266 Development Board
  
• More than enough straight male header pins to solder into all of the open through-holes on the board

Specifications

• Microcontroller: ESP8266EX
  
• Operating Voltage: 3.3V
  
• Digital I/O Pins: 11 (all I/O pins have interrupt/pwm/I2C/one-wire capability, except for
• D0)
  
• Analog Input Pins: 1
  
• Flash Memory: 4MB
  
• On-Board Switching Power Supply:
  
  • Input Voltage Range: 9V to 12V
    
  • Output: 5V at 1A Max
    
• Board Dimensions: 68.6mm x 53.4mm (2.701" x 2.102") / Long x Wide

Resources

• ESP8266 with Arduino IDE:
  
  • Arduino IDE Board Manager URL: https://arduino.esp8266.com/stable/package_esp8266com_index.json
    
• CH340G Driver Download
  
• ESP8266:
  
  • ESP8266EX Datasheet
    
  • ESP8266 Technical Reference
    
  • ESP8266 AT Instruction Set
    
  • ESP8266 AT Command Examples
    
• D1 R2 Board Schematic

Pins

• Board Pin - Function - ESP8266 Pin
  
  • TX - TXD - TXD
    
  • RX - RXD - RXD
    
  • A0 - Analog input - A0
    
  • D0 - I/O - GPIO16
    
  • D1 - I/O, SCL - GPIO5
    
  • D2 - I/O, SDA - GPIO4
    
  • D3 - I/O, 10k pull-up - GPIO0
    
  • D4 - I/O, 10k pull-up, BUILTIN_LED - GPIO2
    
  • D5 - I/O, SCK - GPIO14
    
  • D6 - I/O, MISO - GPIO12
    
  • D7 - I/O, MOSI - GPIO13
    
  • D8 - I/O, 10k pull-down, SS - GPIO15
    
  • GND - Ground - GND
    
  • 5V - 5V    
    
  • 3V3 - 3.3V - 3.3V
    
  • RST - Reset - RST

All of the I/O pins have interrupt/PWM/I2C/one-wire capability, except for D0