/diy/ - Do It Yourself

Anonymous Sun Sep 3 15:52:51 2017 No.1238179 [View]
File: 5 KB, 250x250, ohm_meter.png [View same] [iqdb] [saucenao] [google]

>>1237681
You have a known voltage Uk, a known resistor Rk and an unknown resistor Rx. Connect Rk between Uk and ADC and Rx between ADC and GND. Now you can calculate Rx. The magic formula is Uadc = Uk*Rx/(Rk+Rx). Solve this equation for Rx and let your machine do the calculation.
>does the resistance matter?
Yes, that's why ohm meters have ranges. If you want a wide Rx range you need to switch Rk to maintain accuracy.

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/diy/ - Do It Yourself

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