An Arduino-based intruder detection system that monitors a laser beam using an LDR. When the beam is broken, an RGB LED turns red and the buzzer plays Für Elise as an alarm. The system self-calibrates ...
LDR wiring: Point the laser directly at the LDR. Connect one leg of the LDR to 5V and the other to A0. Place a 10kΩ pull-down resistor between A0 and GND. Startup calibration — On power-up, the ...
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