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Author Topic: turn a laptop into a voltmeter?  (Read 7706 times)

JoeJoe

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turn a laptop into a voltmeter?
« on: September 15, 2006, 02:32:36 AM »


     I've been looking around for a way to turn a laptop into a volteter using a windows program. Nothing fancy, something simple like taking leads from the com port and reading the voltage on the screen. i need about 10 volts range at .000 resolution. I've found a product that could do it using a pic and microcontroler but it costs more money than i am willing to spend. basically the reason im looking for this is because i use a laptop at my work for doing some math that gets data from a voltmeter. instead of hauling a laptop and a multimeter and constantly changing test ports then inputting the data into the laptop I would rather have the voltage displayed on the screen for me and not have to shift things around (its in a small workspace) if you have seen anything that might work let me know.
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njbrad

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Re: turn a laptop into a voltmeter?
« Reply #1 on: September 15, 2006, 05:53:56 AM »

For the protection a multimeter provides, I think you'd be better off using one.  Many have PC interfaces, such as http://www.radioshack.com/product/index.jsp?productId=2103962&cp=2032058.2032235.2032305&parentPage=search&origkw=voltmeter&kw=voltmeter&parentPage=family

I'm not sure of the details on the model, but the ones I've used in the past had an on-screen display and recording capability.

I've seen experimenter circuits to hook test leads "directly" to a PC, but the warnings they contained were very scary.

Brad
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BiGReD

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Re: turn a laptop into a voltmeter?
« Reply #2 on: September 17, 2006, 09:19:11 PM »

Well, simply put, none of the ports on your laptop could read all the types of voltages and resistance that a $10 multimeter.  You would need some sort of adapter between the voltage source and laptop, something like what Brad suggested.
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wojtoj

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Re: turn a laptop into a voltmeter?
« Reply #3 on: October 03, 2006, 04:20:44 PM »

I am also looking for the same thing.  Help would be much appreciated.

thanks
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Skylined

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Re: turn a laptop into a voltmeter?
« Reply #4 on: October 04, 2006, 07:07:41 PM »

I think that some years ago I saw some kind of osciloscope that used an audio card as input, and then a software the emulated an osciloscope's screen.
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linear

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Re: turn a laptop into a voltmeter?
« Reply #5 on: October 23, 2006, 02:31:54 PM »

I saw it too. I believe it's become this:
http://www.zelscope.com/
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Skylined

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Re: turn a laptop into a voltmeter?
« Reply #6 on: October 23, 2006, 09:38:36 PM »

I see dead people!
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linear

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Re: turn a laptop into a voltmeter?
« Reply #7 on: November 01, 2006, 03:35:35 PM »

The reports of my death are greatly exaggerated.
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wonko

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Re: turn a laptop into a voltmeter?
« Reply #8 on: November 01, 2006, 05:39:43 PM »

I see dead people!

I saw a dead person just yesterday.  It aint what it's cracked up to be!
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