Same for me. Since the rfid reader connected, the internal Speaker make PIEP every time.
I use M5Stack core, with the M5 rfid reader.

With this noise, the complete environment make non-sense...

@world101

Uhh, sorry. Here the english version...

Hallo Felix,

now it's work, with byte array...

Hi Felix,

no problem. Will try to find the error...

Thanks for your help!!

Mhh, still not work. Don't know what's wrong...

Hi Felix,

Vielen dank für Deine Unterstützung ! Sprichst du deutsch ?

Thanks for your help. I will try both options, and will send a feedback here.

Hello,

i have a M5Core device.

Yes, i switch from TX23 -> to TX17, and RX19 -> to 16. Thanks for this tip.

But, now i have a last question, see screenshot below.
I Arduino i write with Serial2.write(...) the Hex. How can i do this in the UIFLOW ?!

Please see screenshots...

Hope you can help me, with my last question...

Thats not work. The code hang on the line set UART...

Whats wrong ??