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adi82
Joined: 14 May 2007 Posts: 1
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Posted: Mon May 14, 2007 11:29 am Post subject: help!! |
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It is about a wind-velocity measurement digital circuit in an exam question.
Here is the link where you can see the circuit:
http://www.diskusjon.no/index.php?showtopic=752114&hl=+temperaturm%E5ler
Its norwegian but you can see the circuit if you scroll down on the page.
Well anyways the question is pretty simple actually:
The 7 segment display is showing 00 even though the wheels on the wind-velocity measurer are rotating.
What are the possible reasons for that?? |
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vtech
Joined: 08 May 2006 Posts: 1264 Location: USA
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Posted: Tue May 15, 2007 1:23 am Post subject: |
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Could be a number of possibilities. The optocoupler pulse is used as a source to counted down /process against a preset reference oscillator while trigerring the segment displays. Beside the connection& or power supply issues, I'd start by tracing the optocoupler pulse onward..... |
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