Subject:
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Sharp GP2D12 and Expansion Board
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Fri, 1 Dec 2000 20:48:11 GMT
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Viewed:
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971 times
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Get a load of this...
I have 2 handyboards and 2 expansion boards. I cut the traces to the pull
up resistors for analog port 0 on both boards. One handyboard/expansion
board worked perfectly with the Sharp GP2D12 analog IR range finder. With
the other one, the GP2D12 worked on analog(0) and analog(16) but on no other
analog ports.
Experiment:
I tried swaping the expansion boards to see what would happen. On both
handyboard/expansion boards the GP2D12 worked on analog(0) and analog(16)
but no other ports. Very odd??? I swapped the boards back and the same
problem.
I'm guessing I must have dammaged the second expansion board in some weird
way when I swapped them the first time.
Any ideas???
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Message has 3 Replies:
 | | Re: Sharp GP2D12 and Expansion Board
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| When I connect the ground to the analog input for ports 17 to 24 I still read the value 250, when I get the value 0 on any other analog port including port 16. Does this mean my 74HC4051 chip is dead??? "Robin Chahal" <rchahal@hotmail.com> wrote in (...) (24 years ago, 5-Dec-00, to lugnet.robotics.handyboard)
| | | Re: Sharp GP2D12 and Expansion Board
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| I tried replacing the MUX...that wasn't it. I just noticed that I can read analog(19) through analog(16) but I can't read analog(19) directly...must be an address problem....the question is where. "Robin Chahal" <rchahal@hotmail.com> wrote in (...) (24 years ago, 7-Dec-00, to lugnet.robotics.handyboard)
| | | Re: Sharp GP2D12 and Expansion Board
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| I've identified the problem a little more but still no idea how to fix it. Analog ports 24 to 31 on the expansion board do not work at all. Analog port 16 on the expansion board works perfectly. If I gound the input to any of analog ports 16 to 23 (...) (24 years ago, 12-Dec-00, to lugnet.robotics.handyboard)
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