@brossingo Do you use a pycom board? Then add some wait. You have to wait until the *Py and the board is initialized. Sadly there is no flag or event which tells you that init is ready. So you have to find the right time for your system by your own. It will depend on firmware version and the hardware you added - especially your display. Give 1.20 rc4 a try. This version solved my problems with i2c and pytrack

@robert-hh Thanks. it is working with 115200.