photocell project

[jacobi]

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]

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]

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*)]

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]

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.