Measuring AC Voltage

TWilson

I'd like to use the Basic Stamp to measure AC line voltages, but am not sure about the interface circuit.
Possibly convert to DC, then use a voltage divider circuit?
All comments are welcome.
Thanks...

Franklin

What type of measurement do you want? Just average voltage or AC following?

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- Stephen

Mike Green

The safest and cheapest solution would be to use a small power transformer that takes the 120VAC and produces maybe 6VAC, then use a bridge rectifier and filter capacitor on the output to produce roughly 10VDC which you can run through a voltage divider to measure with the Stamp. There are other solutions, but most of the safe and simple ones would also use a small power transformer.

TWilson

...just average voltage. I'd like to be able to reflect the 120 AC line voltage as if measuring on a voltmeter.

Franklin

Mike is on the right track.

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- Stephen

sam_sam_sam

T Wilson

·I'd like to be able to reflect the 120 AC line voltage as if measuring on a voltmeter.

Use a·9 volt transformer to make 120· volts this might be Little closer but may be harder to find

·Allot saver than 120 volt AC· and easier to do Trust me on this one

I agree with·Mike Green what is in his Post

Here is something that might work for you it is 12 at 150 milliamps

Now what I have done in the past is load the power supply with (ADD enough)·LEDs to bring the NO LOAD voltage·to 12 volts and just move (.)·to the Line Voltage value

http://www.mpja.com/prodinfo.asp?number=17565+PD


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··Thanks for any··that you may have and all of your time finding them

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Sam

Post Edited (sam_sam_sam) : 9/24/2009 1:23:51 AM GMT