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Measuring RPMs using PIC16F877

 
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siphorob



Joined: 12 Oct 2010
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Measuring RPMs using PIC16F877
PostPosted: Sun Oct 24, 2010 9:26 am     Reply with quote

Hi,

I'm using a hall effect sensor to calculate the speed of a dc motor, I tried a couple of Examples listed in CCS with very little luck.

Please help.
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Brandon
jacqueskleynhans



Joined: 10 Apr 2008
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PostPosted: Sun Oct 24, 2010 9:38 am     Reply with quote

Hi Brandon, You have to be more clear than that.

Post your code that you have so far with your compiler v.
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siphorob



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PostPosted: Sun Oct 24, 2010 9:41 am     Reply with quote

Hi,

I am using the example in EX_FREQC.C:

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Reason: Forum Rule #10

10. Don't post the CCS example code or drivers, or ask for such code and drivers.
http://www.ccsinfo.com/forum/viewtopic.php?t=26245

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Brandon
siphorob



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PostPosted: Sun Oct 24, 2010 11:31 am     Reply with quote

Was the information provided enough?
Please advise.
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Brandon
SherpaDoug



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PostPosted: Sun Oct 24, 2010 11:39 am     Reply with quote

When you say you had very little luck, what happened? What did it do that it should not have, or what didn't it do that it should have? Did it hang? Did it give bad numbers? Zeros? Etc.
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PCM programmer



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PostPosted: Sun Oct 24, 2010 12:07 pm     Reply with quote

siphorob,
Use the forum's search page to find code for this. There is a link to
the Search page at top of the forum. Search for this:
Quote:
measure frequency

Make sure you select "Search for all terms".

You will find both software and hardware (using PIC peripheral modules)
solutions.
biozen



Joined: 08 Sep 2010
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PostPosted: Mon Oct 25, 2010 1:53 am     Reply with quote

We use Allegro gear tooth sensors for a product. The sensors produce a square wave which 'reflects' when the gear tooth passes across the sensor. Use the External Interrupt on the PIC to catch the rise/fall that indicates a gear tooth just passed. Using a timer you can measure the time between the two (or more) gear teeth. Do the maths there after to get the RPM...

We use a gear of 16 teeth. Start the timer and start counting the teeth. At the end of 16 counts of gear, stop and read timer. Average this over a few readings. This is the time for one rotation.

HTH,
Mohit.
siphorob



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PostPosted: Mon Oct 25, 2010 5:33 am     Reply with quote

Dear PCM programmer,

I have tried a variety of samples found on the search results, the problems I have with code is very vague, or does not work completely.
Some of the treads are left with no conclusions. Is there a thread that maybe has a good solution?

Kind Regards,
Brandon

siphorob@gmail.com
siphorob



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PostPosted: Mon Oct 25, 2010 5:55 am     Reply with quote

I also tried using the count.c program on this thread:
http://www.ccsinfo.com/forum/viewtopic.php?t=41877
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Brandon
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