The Wemos D1 Mini is an IoT board based on the popular ESP8266 chip from Expressiff. The board is Arduino compatible and provides the smallest form factor of any other ESP8266 board available.
- 11 digital input/output pins, all pins have interrupt/pwm/I2C/one-wire supported(except D0)
- 1 analog input(3.3V max input)
- 4MB flash
- a Micro USB connection
Wemos D1 Mini ESP8266