Reading Digital caliper with Arduino

[EdK]

(03-28-2015, 09:30 AM)arvidj Wrote: I guess it doesn't really matter as the interrupt is simply trying to capture the bit stream without any thoughts as to what it means. It will be the responsibility of the program loop to take the captured bit stream and peal the bits back off the captured stream as flags and nibbles and digits and ... to determine what the information is.

As long as the interrupt and the program loop agree on how the bits are put into the captured stream we will be good.

I agree Arvid and it's more work to shift right so it's best to keep it simple inside the ISR. Either way, we should be seeing some data.

Last evening I used the ISR to set a dataAvailable flag and then polled that flag in the main loop. When the flag was set I'd read the data line and store it into an array of bytes. Once I had 24 bits I'd send the array to the serial monitor and I was seeing the correct data bits but the data pattern was shifting within the 24 bits.

Ed