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