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Build your own auto-ranging Ohmmeter! (with Arduino)

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Check out this ohmmeter built and coded from scratch using an Arduino, 8 precision resistors, a multiplexer, and an OLED display! It can measure resistance from 0Ohm to 1Gohm with fairly high accuracy and it’s even auto-ranging!

We’ve provided all the code, a parts list, and a schematic diagram linked in the description – so you can easily build this on your own as well.

We have our own Steve Stefanidis, one of Programming Electronics Academy’s technical writers, to thank for designing this great project.

Check out this project build, and watch us test it against an off-the-shelf multimeter we got from amazon.

Arduino ohmmeter on breadboard
OHMMETER SCHEMATIC
Arduino ohmmeter schematic
PARTS LIST
The parts required for this project are:

Arduino Uno, Nano, Pro Mini, Pro Micro or equivalent
1% tolerance 1/4W resistors: 49.9, 100, 1K, 10K, 100K, 1M, 4.99M, 10M
MAX 4617CPE High-Speed Low-Voltage CMOS 8:1 Analog Multiplexer
SSD 1306 OLED SPI display (2-color: yellow and blue)
220uF 16V filtering electrolytic capacitor
Breadboard and wires

OHMMETER CODE

CONTINUED…
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***About Us:***
This Arduino lesson was created by Programming Electronics Academy. We are an online education company who seeks to help people learn about electronics and programming through the ubiquitous Arduino development board.

***We have no affiliation whatsoever with Arduino LLC, other than we think they are cool.***
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