Light Sensor - Electronic Circuits Projects Diagrams Free

behrendfry · 28th November 2005, 04:11 PM

I am designing a circuit that is used to detect light. The sensor is mounted in an eyecup and when the system is turned on the sensor will detect light from the screen display. This is used to track battery life of the system. When the system turns on the sensor will detect light and send a high signal that triggers a clock that tracks the time and when the system runs out of battery life the diplay shuts down and of course emits no light, stopping the clock and activating a buzzer to let the user know the battery life test is complete. I have been looking for a few light sensors and found a few, I just wanted to ask if anyone had suggestions on a sensor that could be used

zachtheterrible · 28th November 2005, 05:55 PM

Sounds like a simple LDR- light dependent resistor would work, and would probably be the easiest to use. Resistance goes up as light decreases.

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28th November 2005, 04:11 PM	(permalink)
behrendfry	Light Sensor I am designing a circuit that is used to detect light. The sensor is mounted in an eyecup and when the system is turned on the sensor will detect light from the screen display. This is used to track battery life of the system. When the system turns on the sensor will detect light and send a high signal that triggers a clock that tracks the time and when the system runs out of battery life the diplay shuts down and of course emits no light, stopping the clock and activating a buzzer to let the user know the battery life test is complete. I have been looking for a few light sensors and found a few, I just wanted to ask if anyone had suggestions on a sensor that could be used __________________ Justin Fry Electrical Engineer 703-550-5510

28th November 2005, 05:55 PM	(permalink)
zachtheterrible	Sounds like a simple LDR- light dependent resistor would work, and would probably be the easiest to use. Resistance goes up as light decreases. __________________ I'm no electronics god, i just talk too much.