Messing around with Arduino can ... a gold band resistor could have a 5-percent higher or lower Ohms value due to possible variance in the manufacturing process. These color bands and the ...

How the resistor color-code bands work At the heart of the project is an Arduino Nano clone and a potential divider that measures the resistance of the test resistor against a known fixed value.

Of course, you can excruciatingly read the color codes one by one ... There is a funnel that admits one resistor at a time into a test area where it is measured. A plate at the bottom rotates ...