Electronics > Beginners

Is there someting to improve in this design? - Milliohm meter

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Arek_R:
Well its arduino pro micro(mega32u4) + 1'3 OLED graphic display.
But I also may use graphical "8x2" oled display instead.
And now with the amount of functions I may add a 4 membrane buttons, plenty of them on ebay for dirt cheap.
50/60Hz rejection haha, this primarly weekend project turns into quite advanced device xD
Not much time recently tho :/

David Hess:

--- Quote from: Arek_R on November 16, 2018, 11:43:53 pm ---Actually you're right, 4-20mA exists for a reason :p
So what would be a better way to switch it if not h-bridge?
--- End quote ---

Diodes can be used for current switching with the advantage of lower capacitance and lower leakage.  But an h-bridge is easier to understand and likely good enough.

Lukas:
Seems like you're all missing one trick: Instead of using a DC current, use AC current and all offset errors are gone. See https://www.analog.com/media/en/technical-documentation/application-notes/an98f.pdf page 10 for an example. Instead of using a synchronous demodulator, digitizing the signal using the MCUs builtin ADC might also be feasible.

kripton2035:
this one is using an ADS1115
http://circuitcellar.com/cc-blog/build-an-accurate-milliohm-meter/

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