Reverse engineering a CRC byte of a message

jremington:
It is much more useful to collect messages where the data differ by only one single bit, for example when the temperature goes from 0 to 1, or from 2 to 3 (but not from 1 to 2, because two bits change).

If you collect a bunch of messages that exhibit single bit changes in the data fields and post them, I or others may be able to help you solve this problem.

I can do that. But must luck I can have with temperature. Changing ph so slow to read them all will be almost impossible