Subject:
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Re: Infrared Optosensors
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Fri, 5 Jun 1998 12:25:50 GMT
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Original-From:
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Fred G. Martin <fredm@media.mit.edu&spamcake&>
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Viewed:
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1226 times
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1/2" is actually pretty good range for a basic reflectance sensor.
try using them in the analog inputs -- you should get readings that
let you read out to about 1".
to get better than that, you need a modulated signal, like Pandit has
described.
Fred
In your message you said:
> I interfaced 3 infrared optosensors to the digital inputs on the handyboard.
I'm a little dissapointed in their performance however. The only time they give
a reading of "true" is if they are about a half an inch or closer from the tar
get. Any further away than half an inch results in a "false" reading because th
e sensors are out of range.
>
> Is there any way at all to have a bigger range. I want to have the sensors 2
inches away from what they are to detect. If anyone has been using the optosens
ors I'd like a little input.
>
> -Should I use smaller resistors on the sensors?
>
> -Is the range short because of how fast the digital(); function checks the se
nsor? If it took longer to check would it then give the sensor more time to let
the infrared beam to reflect back?
>
> -Do I need stronger optosensors all together?
> ( I'm using the Quality Tech. 1114, as shown in the HB manual )
>
> Thanks in advance,
> _________________________________________________
> /////////////////////////////////////////////////
> Brian Carvalho [ brian-c@ieee.org ]
> DeVRY Institute
> New Jersey
> _________________________________________________
> /////////////////////////////////////////////////
>
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Message has 1 Reply:
 | | Re: Infrared Optosensors
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| I've had pretty good luck getting up to around 2" by using a standard IR LED and standard IR phototransistor, modulating the IR LED in software, and looking at the analog value returned from the phototransistor like so: { int refl; led_on(); refl += (...) (26 years ago, 5-Jun-98, to lugnet.robotics.handyboard)
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Message is in Reply To:
| | Infrared Optosensors
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| I interfaced 3 infrared optosensors to the digital inputs on the handyboard. I'm a little dissapointed in their performance however. The only time they give a reading of "true" is if they are about a half an inch or closer from the target. Any (...) (26 years ago, 5-Jun-98, to lugnet.robotics.handyboard)
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