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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.
Gustav
Ahh, thanks!
As @AkosLukacs says, the MDBT42Q has 3.3v inputs, so you just need to connect the line that says 5v on your joystick to the 3.3v pin on the MDBT42Q.
There's nothing 'smart' on the Joystick board - it really is just potentiometers so will work just fine off whatever voltage you supply.