Schematics > Security and other sensors and detectors > Light/Dark Detector
Light/Dark DetectorThis 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
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
Title: Light/Dark Detector
Source: www.aaroncake.net/circuits/
Published on: 2005-02-10
Reads: 712
Print version:  Other schematics from Security and other sensors and detectors
Magnetic proximity sensors Capacitive Sensor Field-strength meter Police Siren Electronic detector of air flow Beeper Door Alarm Big Ben Sound Voice activated switch Frost Alarm
Schematics > Security and other sensors and detectors > Light/Dark Detector |
Home
