Subject:
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5mm range reflectance sensor
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Thu, 8 Feb 1996 16:29:02 GMT
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Original-From:
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James Hu <JXH@CS.saynotospamWUSTL.EDU>
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Viewed:
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2127 times
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Hello,
I've got a 5mm range reflectance sensor which I am trying to get to
work with the handyboard, without much success. Here is what I have:
DigiKey part #: OR506-ND
Manufacturer #: EE-SB5V
The labels on the leads are as follows:
.--- (+)
.--, /
/ /|/ .--- L
/ / | /
:--: |/ .--- OUT
| | | /
+ + |/ .--- (-)
/ / | /
:--: |/
|[]| |
> < . +
|{}|/| /
`--' |/
`--'
With some experimentation I have determined that indeed, with a 330ohm
resistor on the (+) lead and L in ground, the emitter indeed works. I
tested this by making the buzzer chirp when the IR receiver detects
signals. However, attaching OUT to signal and (-) to ground has only
led to a reading of 251 on the analog port, and it does not seem to
respond when the sensor is held within 5mm of a sheet of white paper,
or when pointed into empty space. Cutting down the resistance from
the default 47Kohm pegs the reading to 255, but again no response.
So, as far as I can tell, the receiver on the sensor isn't working.
I am open to suggestions. I will say that I would rather not cut any
traces on my handyboard. I do have an old 2.0 miniboard with 4 traces
cut on the analog ports between signal and +5v. I have been thinking
about attaching a varable resistor on one of them and playing around a
little bit. Would this be a reasonable thing to do? If I find that I
require a resistance much greater than 47Kohm, would there be a way to
do attach it to the handyboard without cutting a trace?
It has also been suggested to me that the receiver itself may require
a -5v to operate. Could this be right?
Thanks Fred! The handyboard is great. I can't wait to try out the
expansion board.
And thanks in adavance for any help from the list.
-- James
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