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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.
@fanoush
Pixl.js is nrf52832, it has only 1 uart preconfigured to pins D0,D1 https://github.com/espruino/Espruino/blob/master/boards/PIXLJS.py#L23 and https://github.com/espruino/Espruino/blob/master/boards/PIXLJS.py#L113
When you disconnect from BLE the interactive console is switched to Serial and interferes with your usage. You can use
Bluetooth.setConsole(true)to force interactive console to stay away from serial even when bluetooth is disconnected.