3Pcs Geekcreit® D1 R2 WiFi ESP8266 Development Board Compatible Arduino UNO Program By Arduino IDE

The D1 R2 is a mini wifi board based on ESP-8266EX. 11 digital input/output pins, all pins have interrupt/pwm/I2C/one-wire supported(except D0) 1 analog input(3.3V max input) A Micro USB connection A power jack, 9-24V power input. Compatible withArduino Compatible with nodemcu Getting Started Arduino Getting Started NodeMcu Getting Started Technical specs: Microcontroller ESP-8266EX Operating Voltage 3.3V Digital I/O Pins 11 Analog Input Pins 1 Clock Speed 80MHz/160MHz FLash 4M bytes Length 68.6mm Width 53.4mm Weight 25g Pin Function ESP-8266 Pin TX TXD TXD RX RXD RXD A0 Analog input, max 3.3V input A0 D0 IO GPIO16 D1 IO, SCL GPIO5 D2 IO, SDA GPIO4 D3 IO,Pull-up GPIO0 D4 IO,pull-up, BUILTIN_LED GPIO2 D5 IO, SCK GPIO14 D6 IO, MISO GPIO12 D7 IO, MOSI GPIO13 D8 IO,pull-down, SS GPIO15 G Gound GND 5V 5V - 3V3 3.3V 3.3V RST Reset RST *All IO have interrupt/pwm/I2C/one-wire supported(except D0) Programming: The D1 R2 has a micro USB for auto programming. Also you can programming it using OTA Warnings: All IO is work at 3.3V. Package included: 1 x D1 R2 WiFi ESP8266 Development Board