Laser Tripwire with 555

130

01:58:10

Based in this circuit:
http://www.instructables.com/id/Laser-Tripwire-Alarm/

The lamp is the buzzer, with this circuit the buzzer will not stop beeping after triggered, you will need to reset using the switch on the right. 
The 2nd resistor on the left is the photoresistor.
To start the simulation, tap the switch. 

published 8 years ago

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