Hello @ajb2k3 I took a look on your UIFlow handbook for some examples on serial communication. I found this: [image: 1680074761199-101c0ef1-393b-4e13-9081-d0d4be3f153c-image.png] It seems the code is almost the same than the one generated for me by UIFlow. The imported libraries are the same than the ones I have in my code: from m5stack import from m5ui import from uiflow import On the example provided by my reader's provider; they import this library: " #include <SoftwareSerial.h>" https://wiki.seeedstudio.com/Grove-125KHz_RFID_Reader/#play-with-arduino But I think this is the implémentation for Arduino and I guess the equivalent UIFlow libraries are loaded through this: from m5stack import from m5ui import from uiflow import Do I miss something ? On my side I think the reader works because when I bring a RFID tag close to it; the status led of the reader lights up. But I still receive nothing on the M5 core RX PIN Thank you for your help Best regards