Digital I/O
Board-Specific Pins
The Raspberry Pi Pico RP2040 chip supports up to 30 digital I/O pins, however not all boards provide access to all pins.
Tone/noTone
Simple square wave tone generation is possible for up to 8 channels using
Arduino standard tone
calls. Because these use the PIO to generate the
waveform, they must share resources with other calls such as I2S
or
Servo
objects.