Arduino Laser Trip Wire

For this dandy little project you'll need: Arduino - I'm using an Arduino Uno a 3 x 4 keypad a 16 x 2 LCD screen a laser module/sensor a light dependent resistor (LDR) a buzzer 3 x 220 ohm resistors 1 x 10K resistor 1 x 10k potentiometer (optional, it's to adjust the LCD screen brightness) an LED and a ton of wires! So, first thing I did was to get the LCD and keypad working together. For this I pretended t ...

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