Reading Digital caliper with Arduino

[EdK]

(03-26-2015, 08:40 PM)arvidj Wrote: Try disconnecting the scale from the data line and then tie it high and see what the app thinks it is reading. Then tie it low and it had better think all the bits are the opposite.

If it doesn't change then ...

What I did before I went to bed last night was to use the diagnostic output pin and in the ISR right after reading the data bit in and storing it in the shift register I output that data bit to the diagnostic pin and the pin followed the data on the input pin so I know it's reading the data bit properly. It has to be something in the way we are storing the bits or displaying the bits. When I get home from work today, I'm going to try putting the serial.print inside the ISR and see if the data displays properly. I know it's advised not to do that but for a test it'll add one more bit of information to help solve this.

Ed