How to Build a Laser Tripwire
- Connect the one end of the relay coil to the collector of the transistor.
- Connect the other end of the coil to +V end of the power source.
- Connect your resistor and LDR to the base of the transistor.
- Connect the resistor to +V and the LDR to ground.
- Connect the emitter to ground.
- ????
- PROFIT!!!!
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