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photocell project

jacobi

Jan 18, 2018
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I hooked up a led and photocell in series with 5 volts and instead of the
led getting brighter when covered to make dark it gets dull.
Can some photocells be made to do that? I just found some laying around to try.
Could use some advice on this.
 

Harald Kapp

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Nov 17, 2011
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What kind of photocell didi you use?
If you used the LDR type (photoresistor) this is to be expected as the resistance increases without light shining onto the LDR.
 

jacobi

Jan 18, 2018
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Thanks I am sure that is what it is. These aren't marked or nothing,I just thought I'd try them.
So there are a few different kinds of photocells.I just wanted to confirm that. Thanks again
I feel better already.
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
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Jan 21, 2010
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Well there are different types of sensors, but you'll struggle to find one that reduces it's resistance in the dark.

Typically the LDR you have would be coupled to a simple circuit to turn in a load when it's dark.

The classical circuit could probably be found by googling for "dark sensor circuit"
 

jacobi

Jan 18, 2018
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Well there are different types of sensors, but you'll struggle to find one that reduces it's resistance in the dark.

Typically the LDR you have would be coupled to a simple circuit to turn in a load when it's dark.

The classical circuit could probably be found by googling for "dark sensor circuit"
Thanks steve, I got all that understood now. You all taught me a lot,Good information here.
 
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