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help!!

 
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adi82



Joined: 14 May 2007
Posts: 1

PostPosted: Mon May 14, 2007 11:29 am    Post subject: help!! Reply with quote

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

PostPosted: Tue May 15, 2007 1:23 am    Post subject: Reply with quote

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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