Reading Digital caliper with Arduino

[EdK]

Right now I'm trying to get the internal pull-ups to work. The clock and data are working fine, they just aren't making it to the input pins because the pull-ups don't seem to be activated. I disconnected the interface board from the Arduino board and used a 1K pull-up resistor on the clock signal and it worked as expected so I know my interface circuitry is working. Something in the code is not activating the pull-ups in the Atmel chip. By the way, the pin numbers in your code should be pin 15 for the clock and pin 16 for the data.

Ed