How accurate is an Arduino Ohmmeter?

TL;DR

This paper evaluates the accuracy of Arduino-based ohmmeters, analyzing common measurement methods and providing demonstrations to clarify their reliability and limitations in educational settings.

Contribution

It offers a thorough analysis of a widely used resistance measurement method on Arduino, highlighting its accuracy and potential pitfalls.

Findings

Assessment of Arduino ohmmeter accuracy

Identification of common measurement errors

Guidelines for reliable resistance measurement

Abstract

The Arduino platform is widely used in education of physics to perform a number of different measurements. Teachers and students can build their own instruments using various sensors, the analogue-to-digital converter of the Arduino board and code to calculate and display the result. In several cases this can mean incautious reproduction of what can be found on the Internet and an in-depth understanding can be missing. Here we thoroughly analyse a frequently used resistance measurement method and show demonstration experiments as well to make it clear.