$50 robot/photoresistors

[wlc]

Instead of purchasing the photoresistors from radioshack, I'd like to purchase them from Digikey with the rest of my purchase.  I tried locating some myself, but there are so many options with so many specs. Does anyone know of a digikey part# that would work great for this?

Thanks

[Admin]

do a search for:
photocell
phototransistor
CdS

[Trumpkin]

I don't think the values matters too much (someone please correct me if i'm wrong). here is a link to digikey photoresistors  http://search.digikey.com/scripts/DkSearch/dksus.dll?KeywordSearch . If you have a radio shack next to you I highly reccomend you just get them there. Sorry I couldn't help you more!

[SmAsH]

yea value doesnt affect it much. but generally if i use more than one i get the same size for all.

~smash

[airman00]

yea value doesnt affect it much. but generally if i use more than one i get the same size for all.

~smash

yes it does !!!

a 1 M ohm photoresistor and a 10K photoresistor require different software code and also teh comparator , comparing input, would also have to be changed

[Admin]

It matters in what your second resistor value is, and the time response (time it takes to change with light). For a photovore, I wouldn't worry about the value . . .

[airman00]

It matters in what your second resistor value is, and the time response (time it takes to change with light). For a photovore, I wouldn't worry about the value . . .

true but if you use a POT procedure (internal capacitor discharge i think) to measure resistance without a second resistor ( like you would have in ADC), then it matters

[Trumpkin]

but this is for the $50 robot. It doesn't matter for this.