limit switches

[Alan Anderson]

Originally Posted by stephenthe1

actually, limit switches are the opposite of that. They are normally 0, or true, then once pressed, turn to 1...

Using the word "pressed" when talking about how the RC digital inputs work is probably a bad idea. Some switches are normally open and close the contacts when activated, while others are normally closed and open the contacts when activated. Some are built with both options at the same time, and you can choose which contacts to use when you connect the wires. They give different results when "pressed", and can be a source of great confusion for people trying to understand how to program for the digital inputs.

The RC digital inputs have a pullup resistor to +5 volts. Reading them will return a 1 when the switch is open, and a 0 when the switch is closed to ground.