Hello, I am new to Arduino, and electronics in general. I was wondering what the difference between using the Arduino's built in 20K resistor using INPUT_PULLUP, and an external pull down resistor is, other then the logic being reversed where for example with a button HIGH means it is not pressed, …

[SOLVED]Difference between INPUT_PULLUP and an external pull down resistor?

system September 4, 2012, 11:25pm 8

Alright, thanks everyone.

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