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How to make Arduino LED Tester + Resistor Calculator

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A nicely crafted workshop tool. If you work with a variety of different LEDs this tester will come in very handy! Shared by Mirko Pavleski on Hackster.io:

The device described in this video is a useful tool for testing, and determining characteristics of LEDs, as well as a calculator for calculating the series resistor depending on the connected voltage.

See the full guide!

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