Designing an Auto-Scale Voltmeter - Electronic Circuits Projects Diagrams Free

marateb · 17th June 2007, 07:07 AM

Hi,

I've a question and will be really grateful for your kind assistance.

I want to design an Auto-Scale Voltmeter.
What should I do ?

I know Microcontrollers but I do not know how to preserve the accuracy for small and large signals ??

Thanks,

**3v0** · 17th June 2007, 11:56 AM

I have never built one but.

Build a voltmeter with several scales using a uC.

Then have the software sample each scale to see which is the best fit (lowest setting). If you sample from little to big it will be the first reading that is not at max or min.

Nigel has a tutorial on using op amps to scale analog input. It includes info on building the hardware on vectorboard but you can do it anyway you desire.

I think Microchip has an appnote on building a voltmeter. Not sure if it is auto ranging.

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17th June 2007, 07:07 AM	(permalink)
marateb	Designing an Auto-Scale Voltmeter Hi, I've a question and will be really grateful for your kind assistance. I want to design an Auto-Scale Voltmeter. What should I do ? I know Microcontrollers but I do not know how to preserve the accuracy for small and large signals ?? Thanks,

17th June 2007, 11:56 AM	(permalink)
3v0	I have never built one but. Build a voltmeter with several scales using a uC. Then have the software sample each scale to see which is the best fit (lowest setting). If you sample from little to big it will be the first reading that is not at max or min. Nigel has a tutorial on using op amps to scale analog input. It includes info on building the hardware on vectorboard but you can do it anyway you desire. I think Microchip has an appnote on building a voltmeter. Not sure if it is auto ranging. __________________ search engine for electronic parts Junebug USB PIC programmer kit., USB Bit Wacker, 3v0's Homepage The 15 Minute Printed Circuit Board! (+drill time)