The Raspberry Pi Pico RP2040 chip supports up to 30 digital I/O pins, however not all boards provide access to all pins.
Pin NotationWhen using Analog or Digital I/Os, if you supply an integer it specifies the RP2040 GPIO pin to use. Using Dx or Ax notation (for example, D4 or A3) may be necessary on boards without a direct PCB pin to GPIO mapping.
Input ModesThe Raspberry Pi Pico has 3 Input modes settings for use with pinMode: INPUT, INPUT_PULLUP and INPUT_PULLDOWN
Output Modes (Pad Strength)The Raspberry Pi Pico has the ability to set the current that a pin (actually the pad associated with it) is capable of supplying. The current can be set to values of 2mA, 4mA, 8mA and 12mA. By default, on a reset, the setting is 4mA. A pinMode(x, OUTPUT), where x is the pin number, is also the default setting. 4 settings have been added for use with pinMode: OUTPUT_2MA, OUTPUT_4MA, which has the same behavior as OUTPUT, OUTPUT_8MA and OUTPUT_12MA.
Tone/noToneSimple 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.
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