Hi there! I want to make a LED project. I have 4 LEDs and want to make my Arduino UNO to light them up: Blue LED lights up Red LED lights up Green LED lights up Yellow LED lights up Blue LED goes off Red LED goes off Green LED goes off Yellow LED goes off and so on ... I tried myself but didn't …

How to make a led-row?

quamikazee October 28, 2017, 10:41pm 4

I wonder why they don't make LED's that have resistors built in?

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