Subject:
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Re: light sensor
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 15 Dec 1998 21:37:12 GMT
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Original-From:
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Barry Bott <barry.bott@virgin.#Spamcake#net>
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Viewed:
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1436 times
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Michael Gasperi wrote:
> 6.6 V DC is kinda low for new batteries. It should read 7 to 8 VDC with
> a normal multi-meter. The light sensor should easily read 100 when a
> flashlight is pointed into it, but my sensor doesn't read much below 20
> in the dark.Somewhere in the setup part of the software it will read the
> RCX battery voltage. Maybe you have a few bad batteries.
Hi Michael,
Yes I'd begun to suspect that so I'd bought a new set, sure enough the
sensor voltage went up to 8 volts. What was fooling me was expecting the
full 0 to 100 range on a light sensor in reflective mode!
As Mathew points out, if I point a bright light at it I do get a reading
of 100, kinda poor as a reflective sensor though, the range is ~30-50.
Never mind I'll go back to building a temperature and rotation sensor.
Barry
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Message is in Reply To:
 | | Re: light sensor
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| (...) 6.6 V DC is kinda low for new batteries. It should read 7 to 8 VDC with a normal multi-meter. The light sensor should easily read 100 when a flashlight is pointed into it, but my sensor doesn't read much below 20 in the dark.Somewhere in the (...) (26 years ago, 15-Dec-98, to lugnet.robotics)
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