I am using an Arduino Uno to light up the LED buttons for an arcade machine console. There are about 18 Buttons in total. 9 red and 9 blue. i am using digitalWrite(ledButtonPin, HIGH); to turn the buttons on and off. whats happening is that only the blue buttons are turning on. when I remove the …

Arduino Output Pins only providing 3.5v

DrDiettrich April 26, 2018, 3:39pm 12

The button LEDs are rated 5V, i.e. they include a resistor.

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