Overview WeMos D1 Mini is mini WiFi board based on ESP8266. It is compatible with Arduino and NodeMcu.
Description: Breadboard friendly Use CH340 for USB interface. CH340 Driver 11 digital input/output pins, all pins have interrupt/pwm/I2C/one-wire supported(except D0) 1 analog input (3.3V max input) Mirco USB Port Reset Button lots of shields
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: 34.2mm Width: 25.6mm Weight: 10g Warnings: All IOs work at 3.3V.