UART connexion failled

[robert-hh]

@quentho ddi you try to use a simple terminal emulator like Putty or screen or picocom as crosscheck for the UART connection? After updates of Atom or VSC, pymakr sometimes stumbles.
@thibault I tested at least a LoPy with lower input voltages. It worked fine down to 2.8V. Below 3.5V, the regulator switches to bypass mode, resulting at ~3.2V on the board. The ESP32 works fine down to 2.3V. The Sigfox/Lora chip may not work that far down, but 3.2V should be OK.

[thibault]

The Vin of the SIPY need voltage >= 3.5 volt isn't it? On your picture it seems you give 3.3 volt. Are you sure that the sipy was started? You got wifi connection?