project categories:

similar projects:

recently added projects:

most popular projects:

you are here: home page :: circuit diagrams :: Microcontrollers :: Light Detector Circuit

Light Detector Circuit

Notes:
Variable resistor R1 adjusts the light threshold at which the circuit triggers. R1's value is chosen to match the photocells resistance at darkness. The circuit uses a CMOS 4001 IC. Gate U1a acts as the trigger, U1b and c form a latch. S1 resets the circuit. The output device may be a low power piezo buzzer.


author: Mick Devine
e-mail:
web site: http://www.zen22142.zen.co.uk