Light Sensors
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I am working on a line following robot. The track will be a while board
with black electrical tape path.
I'd appreciate you opinions (and even facts) on selecting between an IR
phototransistor sensor and a Cadmium-Sulfide Photocell sensor. I have
circuits for both and have done a little bit of testing and think that
either one could be made to work. I don't have a good way of comparing then
under real-life conditions in the time available. This is for the SFRSA
competition (http://www.robots.org).
Thanks for your help!
-- Al
with black electrical tape path.
I'd appreciate you opinions (and even facts) on selecting between an IR
phototransistor sensor and a Cadmium-Sulfide Photocell sensor. I have
circuits for both and have done a little bit of testing and think that
either one could be made to work. I don't have a good way of comparing then
under real-life conditions in the time available. This is for the SFRSA
competition (http://www.robots.org).
Thanks for your help!
-- Al
Comments
response ; phototransistors might be a little better.
On Mon, 25 Feb 2002, Al Margolis wrote:
> I am working on a line following robot. The track will be a while board
> with black electrical tape path.
>
> I'd appreciate you opinions (and even facts) on selecting between an IR
> phototransistor sensor and a Cadmium-Sulfide Photocell sensor. I have
> circuits for both and have done a little bit of testing and think that
> either one could be made to work. I don't have a good way of comparing then
> under real-life conditions in the time available. This is for the SFRSA
> competition (http://www.robots.org).
>
> Thanks for your help!
>
> -- Al
>
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Sean T. Lamont, CTO / Chief NetNerd, Abstract Software, Inc. (ServNet)
Seattle - Bellingham - Vancouver - Portland - Everett - Tacoma - Bremerton
email: lamont@a... WWW: http://www.serv.net
"Do not fear mistakes, There Are None" - Miles Davis
using the POT command on the BS1 or the RCTIME command on the BS2, the
higher the resistance, the longer it takes to read the value. Found this out
the hard way with a light-seeking robot I built around a BS1 -- it works
fine until it gets into a dark corner, then it takes a 1/2 second or so to
read each photocell.
I personally prefer the Fairchild emitter / detector devices. Parallax even
uses these on their line-follower add-on for the BOEBot.
Original Message
> I am working on a line following robot. The track will be a while board
> with black electrical tape path.
>
> I'd appreciate you opinions (and even facts) on selecting between an IR
> phototransistor sensor and a Cadmium-Sulfide Photocell sensor. I have
> circuits for both and have done a little bit of testing and think that
> either one could be made to work. I don't have a good way of comparing
then
> under real-life conditions in the time available. This is for the SFRSA
> competition (http://www.robots.org).