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Arduino Uno

Pin Aliases

alias pin
red_led 13
builtin_led 13
user_led 13

Overview

Arduino Uno is a microcontroller board based on the ATmega328P. It has 14 digital I/O pins (0–13) and 6 analog inputs (A0–A5).

Digital Pins

  • Pins 0–13: Digital I/O. Can be INPUT or OUTPUT.
  • Pin 13: Built-in LED (onboard). Connect LED to GND or use for output.
  • Pins 0–1: Also used for Serial (RX/TX). Avoid if using Serial.

GPIO

  • digitalWrite(pin, HIGH) or digitalWrite(pin, LOW) for output.
  • digitalRead(pin) for input (returns 0 or 1).
  • Pin numbers in ZeroClaw protocol: 0–13.

Serial

  • UART on pins 0 (RX) and 1 (TX).
  • USB via ATmega16U2 or CH340 (clones).
  • Baud rate: 115200 for ZeroClaw firmware.

ZeroClaw Tools

  • gpio_read: Read pin value (0 or 1).
  • gpio_write: Set pin high (1) or low (0).
  • arduino_upload: Agent generates full Arduino sketch code; ZeroClaw compiles and uploads it via arduino-cli. Use for "make a heart", custom patterns — agent writes the code, no manual editing. Pin 13 = built-in LED.