claw/third_party/zeroclaw/docs/hardware/datasheets/arduino-uno.md

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.