Subject:
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Analog Ports
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Sun, 24 Jan 1999 21:59:20 GMT
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Original-From:
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Ranjit Diol <rsdiol@%nospam%mail.com>
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Viewed:
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994 times
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I have the MTJPRO11 board by Mekatronix as well as the MIT HandyBoard
both use the 68HC11A1FN mcu. I am using hacked Sharp GP1U58 'tin can'
detectors so that they output analog voltage from 1.5 to 2.5 ( effective
proximity range is approximately 4" to 16" when using a 5ma current on
an uncollimated IR Emitter). The units work quite well with the MTJPRO11
using any of the PE0-7 analog inputs. They yield A/D values between 88
and 130 based on the proximity of an object within 4" - 16".
However, when I try them out on the HandyBoard's analog inputs they do
not work, all I get is an A/D value of approx 210 which does not change.
The only difference that I can see between the analog ports on the two
units is that the HandyBoard uses a 47k pull-up resistor on the input
pins of the PE port.
Any suggestions as to how I can use them with the HandyBoard will be
appreciated.
Thanks,
Ranjit
--
Ranjit Diol - COMPSys
Dowagiac,Michigan
e-mail: rsdiol@mail.com
website: http://www.compsys1.com
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Message has 1 Reply:
 | | Re: Analog Ports
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| yes, it's the 47K pullup that's causing the IR's to not work. slice through the trace connecting the 47K to the sensor input pin on the underside of the printed circuit board. fred In your message you said: (...) (26 years ago, 24-Jan-99, to lugnet.robotics.handyboard)
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