Tools

ESP32 pin planner

Around half an ESP32's pins have a second job at boot. Pick your chip or Seeed XIAO board, click the pins you want to use, and the planner flags strapping pins, flash pins, input-only pins and ADC2/Wi-Fi conflicts before they end up on a PCB. Then copy the MicroPython pin map straight into Thonny.

It's loaded with the solar panel node from "Half your ESP32 pins have a second job", status LED on GPIO2 included. Your plan is saved in this browser.

Board or chip

Wi-Fi, ESP-NOW or BLE in use Keep USB & serial pins free for flashing WROVER module (has PSRAM) External antenna (U.FL) Octal PSRAM module (N8R8 / N16R8)

Pin data comes from Espressif's ESP-IDF GPIO documentation for each chip. Dev boards add their own quirks, like an LED or button on a strapping pin, so always check your board's schematic too.