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An angry box.

Wiring instructions:

  • Connect a small speaker between Arduino digital pin 11 and GND.
  • Connect a button between Arduino digital pin 2 and GND.

To move this from the Arduino board to a stand-alone ATMEGA328 chip, you'll need to set the ATMEGA fuses to tell it to use the internal clock. Follow the instructions at

In this configuration, you'll be able to build this project with nothing more than the switch, speaker, ATMEGA chip, and battery.

More information here: