Light/Dark Detector
Category: Main page » Guard and Security

Light/Dark Detector

This handy little circuit can tell the difference between darkness and light, making it very useful for switching on and off signs, porch lights or other things when it gets dark or light.

Schematic


Schematic for Light/Dark Detector

Parts:

Part

Total Qty.

Description

Substitutions

R1

1

100K Pot

Q1

1

2N3904 NPN Transistor

2N2222

Q2

1

NPN Phototransistor

RELAY

1

9V Relay

MISC

1

Board, Wire, 9V Battery Snap (if battery used), Knob For R1

Notes:

1. R1 Adjusts sensitivity


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