Author Topic: 50$ robot photoresistors  (Read 2679 times)

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Offline manutTopic starter

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50$ robot photoresistors
« on: December 04, 2009, 08:43:37 PM »
hello,
I built my 50$ robot with two photoresistors of different values..now it seems to react differently to my hand hiding the light..
Do you think I should use same value for the photoresistors?
thanx
manu
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Offline Joker94

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Re: 50$ robot photoresistors
« Reply #1 on: December 05, 2009, 02:03:17 AM »
it would be better to use the same valuesfor the sensors.

you may be able to adjust it in the code and all but that is alot more complicated than changing the sensors to the same value

and the same readings will be more accurate and better controlability
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Offline ozbot

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Re: 50$ robot photoresistors
« Reply #2 on: December 05, 2009, 06:09:54 AM »
Yes, get the values as close as possible.  Even when buying a bag of 5 or more of the same part, there are variations and it is good to test them to find the closest pair.
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Offline manutTopic starter

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Re: 50$ robot photoresistors
« Reply #3 on: December 05, 2009, 07:56:35 AM »
okay, thank you...good to know..
Do you know a good value for photoresistors for the 50$ robot? I didn't find it in the tutorial
and also:on the package of one of my photoresistors, it's written: PHOTOCELL 40K-120K  OHM.  Does it mean that the resistance is 40K in the light and 120 K in the dark? ..that means that to find the value of the resistor, I have to calculate it like this: square root of (40K*120)=69,28K OHM  ?
thank you
manu
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