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'but I can't find any pin labelled /marked as UART/USART marker.'
the schematic might provide some assistance:
found below the tutorial image icons beneath heading Information
https://www.espruino.com/Pixl.js#informationhttps://github.com/espruino/EspruinoBoard/blob/master/Pixl.js/pdf/pixljs_sch.pdf
You actually mentioned the Tx/Rx reference D0 and D1 in post #4
'Ok, so I checked Pixl.js documentation. I didn't get anything'
I'll agree that the docs (diagrams for hardware SPI/I2C/USART) are more suited for the STM family, the earlier Espruinos, when the Nordic nRF micros came about, it did take me some time to grasp software SPI/I2C/USART as it can be used on any pin. I'd re-read over the USART link in post #2 and just stick with it. There are plenty of examples and tutorials.
Remember: should you use the hardware USART the Pixl will have to give up B.T. comm which shares that Serial port
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Robin
@bart
Thank you for your help.
I am looking at Pixl.js reference board and also on my Pixl.js but I can't find any pin labelled /marked as UART/USART marker.
Is there a possibility to meet with you on Discord or on Signal teleconference ? I have noticed you have experience with GPS programming