// pinout.md · pi-pico-w

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Filter by function. Tap any pin for details. All chip-side numbering matches the silkscreen.

// board.md ESP32 DevKitC ESP32-S3 ESP32-C3 ESP8266 NodeMCU Pi Pico W Arduino UNO R3 Arduino Nano Arduino Mega 2560 Raspberry Pi 5 BBC micro:bit v2
// notes.md

Board notes

Common gotchas across boards

  • Strapping pins — pins read at boot to decide flash mode. Pulling them low at startup can prevent boot. Avoid wiring buttons / sensors directly to strapping pins without pull-ups.
  • ADC accuracy — ESP32 ADC is noisy and non-linear at the edges (below 0.1V, above 3V). Use averaging + calibration for real measurements.
  • 5V vs 3.3V mix — most modern dev boards run 3.3V logic. Connecting a 5V sensor output directly will damage the input. Check compatibility.
  • I²C pull-ups — most modules include 4.7kΩ pull-ups on SDA + SCL. If you connect multiple modules, you may have too many pull-ups in parallel. Cut pads on duplicate modules.