If you're looking for a different "piece" or component, the book also includes detailed instructions for:
: A door entry alarm that logs timestamps to an SD card. Arduino and Raspberry Pi Sensor Projects for th...
This project uses a sound sensor to detect a "clap" (loud noise) and toggle an LED or appliance. Hardware Needed: Arduino Uno or similar board. Sound Sensor Module (e.g., KY-038 or similar). LED (with a 220-ohm resistor). Breadboard and jumper wires. The Code: If you're looking for a different "piece" or