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Hi,

If i power using a 3,3v battery the Serial0 prints only garbadge. If i using USB Power the same Sketch works perfectly and i see the UART0 output. Do this have todo with the 3.3v power?

Bye
Nino

This might be related with the know hardware issue if Z-Wave chips - it changes MCU speed when connected to USB cable. Try a cable without data wires.

Thanks for your reply.

You mean i should try a power only usb cable? But if i use usb everything is fine... problem starts if i use a battery and no usb at all.

Make sure the UART speed matches