Arduino Laser module use GND



From Youtube : Arduino LDR sensor Laser Tripwire Security Alarm

You can change :

1. GND Pin on Arduino board next 13 pin to Breadboard  Power rails ( GND)

2.  Wiring GND on Power rails (GND) to LED GND

3. Wiring GND on Power rails (GND) to  - or GND on Laser module


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