The Micro Bit has a 25 pin edge connector. There are five large “pins” labelled 0, 1, 2, 3V and GND with 20 other pins in-between.
This diagram shows the official pin numbers as well as programmable features available on each pin.
- 6-7 General purpose input output (GPIO) based on configuration.
- 6 Analogue in
- 2/3 reconfigurable PWM outputs