Light activated switch

kasamiko · Feb 10, 2005

Hi,
I need a simple schematic of a light activated switch using LDR and the output must have a TURN-OFF delay for about 30 seconds..

Thanks.

IanP · Feb 10, 2005

Here is one (has to be slightly modified for your application):
https://www.siliconchip.com.au/cms/A_30672/article.html
Go to section on Super Light Sensor Circuit..

metal · Feb 14, 2005

Hello

You can use LDR with LM555 timer, you need a capacitor on trigger pin, so it only passes once each time the light falls on the LDR.

Regards

sajal1975 · Apr 18, 2005

hi,
u can find good material from
www.commlinx.com.au/Control.htm

netsearcher · Apr 18, 2005

see this page ,simple and usefull
**broken link removed**

have fun

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