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picboy
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3 Posts
Posted - Jan 24 2012 :  05:56:47 AM  Show Profile  Reply with Quote

I have to measure voltage (0- 500v) and current (0 to 5a) using a PIC microcontroller.
Since it takes 0 to 5v, how do i bring the voltage and current down linearly such that.. if i measure 5v, it is equal to 500v , 4=400v, 3=300v etc..
n the same goes for the current.
plz help :)

thanks in advance..

Aaron Cake
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Canada
6718 Posts
Posted - Jan 24 2012 :  09:52:58 AM  Show Profile  Visit Aaron Cake's Homepage  Send Aaron Cake an ICQ Message  Send Aaron Cake a Yahoo! Message  Reply with Quote
Google "voltage divider". Though with 500V you may wish to use an opto-isolator.

As for current, you place a low value resistor in line with the current draw and measure the voltage drop accross that resistor.
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picboy
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3 Posts
Posted - Jan 26 2012 :  01:50:31 AM  Show Profile  Reply with Quote
Thanks :) will an HCPL 7510/7520 work?
here is the datasheet:
http://www.secomtel.com/UpFiles/Attach/2003/11/19/103521.pdf
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Autofashion
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1 Posts
Posted - Feb 10 2012 :  5:53:51 PM  Show Profile  Reply with Quote
I was looking for a similar thing - check out the info at http://electronics-diy.com/70v_pic_voltmeter_amperemeter.php which I think you will find helpful. Just change the resisitor and you have 500v.
Hope that helps.
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