Hi Mirko, > I load the modules as follows: > > modprobe scx200_i2c scl=34 sda=35 > modprobe pcf8591 input_mode=0 Do you have any other chip on that I2C bus? Maybe the bus isn't working at all and it's not the PCF8591 fault. How did you come to these values for scl and sda? -- Jean Delvare