This project is a laser-based security alarm system developed as part of my B.E. Electronics & Telecommunication Engineering coursework. It uses a laser beam and LDR sensor to detect interruptions and ...

Laser Diode Positive Pin (+) → Connect to 5V pin on the Arduino. Laser Diode Negative Pin (-) → Connect to GND on the Arduino. LDR (Light-Dependent Resistor) Connection: LDR Pin 1 → Connect to 5V on ...

Put aside all of the projects that use an Arduino to blink a few LEDs or drive one servo motor. [IngGaro]’s latest project uses the full range of features available in this versatile microcontroller ...

[over9k] used his Arduino to set up a laser trip wire. The laser is mounted along side the Arduino, reflects off of a mirror, and shines on a photoresistor that interfaces via a voltage divider. The ...