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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.
user151645
Hi,
You can wire up something like an HC-05 module (https://www.ebay.co.uk/itm/125085159709) and then connect to the Pico via Bluetooth UART connection. This is a bunch of info on doing it with the original Espruino board which even had a space on it: http://www.espruino.com/Bluetooth
However I'd strongly suggest that you look at one of the Espruino devices (like MDBT42 Breakout - http://www.espruino.com/MDBT42Q) that has bluetooth already on it - that would be so much easier to use. More compact, and it'd use a lot less power too