PROJECT 19: LASER TRIP WIRE ALARM
IN THIS PROJECT, YOU’LL CREATE A SIMPLE LASER TRIP WIRE ALARM.
PARTS REQUIRED
• Arduino board
• Breadboard
• Jumper wires
• Photoresistor
• Piezo buzzer
• Green LED
• 10k-ohm resistor
• Laser pen
You’ve probably seen a movie where a valuable item is protected by a grid of laser beams. The beams look cool and seem pretty high-tech, but the principles behind them are actually very simple.
HOW IT WORKS
When the laser pen shines on the photoresistor, the green LED will light up to signify that the circuit is ready. ...
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