Mark Studebaker writes: > What value of pullup resistor are you using? > 5K is probably about right. Definitely not less than 1K. > I note that doc/i2c-pport doesn't make a recommendation. > We just did some measurements using a digital scope on the clock and data lines on the compass. Just to remind people, the compass sits on address 0x60 (1100000 in binary) and I'm trying to use i2c-pport. When I send the address on the i2c bus (trying to read a register of the device), I do read, synchronised with the clock, the address (1100000), followed by a 0 (write) followed by something at about 1.2V that should be the 0 for the acknowledgement. So clearly, the device is not pulling down enough. Anybody got any idea? TIA, Fred
