This light activated alarm uses a light detecting resistor (LDR) to monitor the absence or presence of light. The alarm is triggered when light is detected. A LED turns on when the alarm is activated. A potentiometer adjusts the sensistivy of the light activated alarm.
The light activated alarm operates on 9 VDC. The circuit board measures 2.4" X 1.3" and will fit inside of project box #3 (see below).
The project includes an explanation of the circuitry, an assembly diagram and schematics.
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