im having some issues with the internal pullup resistors. im trying to use several switches to send signals to a mega. if i use the "digitalinputpullup" example i can get one switch at a time to work but as soon as i try multiples i get nothing. thoughts??
Post your code in code tag (read the forum's instructions)
What do you mean by "not working"?
Are you using delay() by any chance?
Schematic of your wiring?