Hello Falngtrea,

I finally got to talk with the design engineer for the HIH6131. He verified that what I have done is valid. He had several suggestions for me to try. None worked and all NACKed every byte. I tried bit banging. I was able to send all bytes attempted. All were NACKed.

After a discussion, it being that I received my samples in August of 2011, it appears that I received preproduction prototypes. And it is also possible that I may have received dummy units intended for a trade show. Honeywell is sending me fresh samples to try. Hopefully, these will work.

You say that you achieved 100 kHZ clock rate. I tried bit banging and still only got 25 kHz. I doubled the processor clock rate and still only got 25kHZ clock rate. Perhaps it is a idiosyncrasy of the processor.

Were you able to get a humidity count from the sensor?

Thanks for the response. Please keep in touch. I may need your advice when I get the new samples.

Joe Rapoza