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. > Well it actually says: "no pullups requied" (sic), which I believed because of the resistor on the "out pin" on the diagram in the same file. Moreover, a pullup resistor would make it even harder for the device to pull down the signal, which seems to be what causes the noack problem. Right? Cheers, Fred