How to Make an Arduino Ohm Meter? Here’s a really useful and easy project you can do with an Arduino. If you have a hard time reading the color bands on resistors like I do, this project is perfect for you. Instead of struggling every time you need to find the resistance of a resistor, just build an Ohm meter and measure all of your resistors. If you come up with a good way to label and organize them, you’ll never need to spend time guessing the difference between those tiny grey and purple bands again.