Light activated switch

[kasamiko]

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]

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]

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]

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

 

[netsearcher]

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

have fun