Subject:
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Re: Making Light Sensor Passive
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Newsgroups:
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lugnet.robotics.rcx.nqc
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Date:
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Thu, 25 Feb 1999 16:00:55 GMT
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Viewed:
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2698 times
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I'm not sure what you mean by "making light sensor passive". The light
sensor, by design, requires power to work. You can tell the RCX that the
light sensor is a passive sensor, but you don't get much range in readings
- the phototransistor in the sensor just doesn't respond well as a passive
sensor for the RCX. You can still try using SensorType() and SensorMode()
to configure the sensor in different ways (try STYPE_SWITCH for type and
SMODE_RAW for mode).
If the goal is to determine the ambient light in a room, you can still use
the light sensor - it will detect incident light as well as light
reflected from its own LED. Of course, the LED can cause a mis-read under
certain conditions.
If you want to build your own passive light sensor, it is pretty easy -
just attach leads to a CdS cell. There isn't a predefined "config" for
this type of sensor in NQC, but you can still manually configure it with
SensorMode() and SensorType(). Set the SensorType() to STYPE_SWITCH -
that makes the RCX use an internal pullup on the sensor line. Set the
SensorMode() to SMODE_RAW or SMODE_PERCENT depending on how you want to
use the value. Raw readings are from 0 to 1023, percent are converted to
0-100.
Dave
In article <F7pq66.JyM@lugnet.com>, "Mike Moran" <mm@ee.ed.ac.uk> wrote:
> I was wondering if anyone knew how to do this in NQC?
>
> Thanks,
>
> Mike
--
reply to: dbaum at enteract dot com
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