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ESP32 GPIO Reference

Pin Aliases

alias pin
builtin_led 2
red_led 2

Common pins (ESP32 / ESP32-C3)

  • GPIO 2: Built-in LED on many dev boards (output)
  • GPIO 13: General-purpose output
  • GPIO 21/20: Often used for UART0 TX/RX (avoid if using serial)

Protocol

ZeroClaw host sends JSON over serial (115200 baud):

  • gpio_read: {"id":"1","cmd":"gpio_read","args":{"pin":13}}
  • gpio_write: {"id":"1","cmd":"gpio_write","args":{"pin":13,"value":1}}

Response: {"id":"1","ok":true,"result":"0"} or {"id":"1","ok":true,"result":"done"}