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People smarter than I am say that you ALWAYS need to put a resistor inline when you attach an LED to an Arduino. But what happens if you don't? I made a light-hearted, non-scientific 24 hour test to find out.
How do YOU think I could do a better long term test?
This is Will It Blow Up Episode 2
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Amazon US
Elegoo Mega 2560 Board - amzn.to/2LQKvMl
LCD Shield - amzn.to/3riWQJG
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Resistor Assortment - amzn.to/2WAYsAo
Amazon CA
Elegoo Mega 2560 board - amzn.to/3nKnGIA
LCD Shield - amzn.to/3rjNihB
Component Tester - amzn.to/34y6Apu
5mm KED Assortment - amzn.to/3rpjSPd
10mm Giant LEDs amzn.to/3axYC3A
Resistor Assortment - amzn.to/38nFRgx