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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Jean-Philippe_Rey
Are you injecting the 5V on the VUSB or 3.3 pin? Moreover, did you read the warning message on the Espruino Wifi page?
Note: Unlike Espruino Pico and the original Espruino board, Espruno WiFi doesn't contain any battery switchover circuitry. The +/+VUSB pin is connected straight to USB 5V, and shouldn't be used to power the WiFi board while Micro USB is plugged in, unless it is via a diode from 5V.Could you post your schematic?