Hi Inigo, Thank you for your help. I am now able to read from my sensor, however writes are not working. Does the pxfMini use any of the i2c devices, I see two attached, one is my device, what is the other? I was wonderng how the voltage conversion works from 3.3 to 5v. I'm stumped as I can only read from the device, not write, it doesnt throw an error. Any ideas on how I can test this or what to look for. I dont have an oscilloscope, but am starting to think i need one to debug this issue.