WEMOS D1 R2 WIFI ESP8266 DEVELOPMENT BOARD ARDUINO COMPATIBLE
Sepcifications
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 with Arduino
Compatible with nodemcu