I'm working with a very simple circuit to understand push buttons. The code in the tutorial uses the INPUT_PULLUP pinmode. I understand the idea of the pinmode, but I have two questions:
There must be a difference between a LOW reading and no connection, correct? How does the arduino differentiate between the two?
I tried to experiment with this idea. So my thought was that you could create a circuit where the LED only stays lit when you hold the button down. In this setup, I used just normal INPUT for pinmode. So the logic was: if LOW then turn light on, else light off. The turnout was the light was almost always on and just really finicky when i moved the board. Why?