LOLIN D1 mini
A mini wifi board with 4MB flash based on ESP-8266EX.[Buy it]
Features
11 digital IO, interrupt/pwm/I2C/one-wire supported(except D0)
1 analog input(3.2V max input)
Type-C USB Port
LOLIN I2C Port
Compatible with MicroPython, Arduino, nodemcu
Tutorials
Documentation
Technical specs
Operating Voltage | 3.3V |
Digital I/O Pins | 11 |
Analog Input Pins | 1(3.2V Max) |
Clock Speed | 80/160MHz |
Flash | 4M Bytes |
Size | 34.2*25.6mm |
Weight | 3g |
Pin

Note
All of the IO pins run at 3.3V.
Version
V4.0.0 (current)
V3.0.0
V2.3.0
V2.2.0