Subject:
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Re: 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 17:33:37 GMT
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Original-From:
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Gilad Barak <{gilad@}nospam{Orbotech.Co.IL}>
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Viewed:
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2139 times
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> From jxh@plethora.cs.wustl.edu Thu Feb 8 18:47 IST 1996
> 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.
Very nice ASCII graphics.
I don't know this part but assuming that the + and L pins are the pins which
control the transmitter, and asuming the reciever is a photo transistor that
should act as a switch, I would say that you should connect the OUT pin to +5V
via a pullup resistor AND to the input pin - this will give +5V at this input
when the switch does not sense the light. When put close to a reflector the
switch sould conduct and the voltage in the input should drop. I don't know
what 255 represent in the analog input - I would simply use a DVM to check the
operation.
Gilad
-------------------------------------------------------------------------
Gilad Barak - Israel
gilad@orbotech.co.il
or
gilad.barak@Orbotech.Co.Il
-------------------------------------------------------------------------
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