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: 1320
Print version:
Other electronic circuits and schematics from Security and other sensors and detectors
-
Low Voltage Alarm
-
Temperature Sensor with Digital Output
-
Emergency Light & Alarm
-
Field-strength meter
-
Color Sensor
-
Power supply failure alarm
-
DayLight Alarm
-
Ultrasonic switch
-
4 channel Telemetry System
-
Big Ben Sound