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.
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
electronic circuit
Source: www.aaroncake.net/circuits/
Published on: 2005-02-10
Reads: 1369
Print version:
Other electronic circuits and schematics from Security and other sensors and detectors
-
Infrared beam barrier/ proximity sensor
-
Melody generator for greeting cards
-
Car anti theft wireless alarm
-
Field-strength meter
-
Magnetic proximity sensors
-
Power supply failure alarm
-
Digital Remote Thermometer
-
Rain Alarm
-
Electronic Lock
-
Door Alarm