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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.
@Gordon
Urgh. I can't believe they used such a small 40 pin connector for something which really requires only GND, VCC, RX and TX pins!
Looking at the datasheet the pins are at a 0.4mm pitch, so you may be able to find an SMT breakout board at 0.4mm pitch?
Failing that, you may be able to hand-place pads and tracks at 0.4mm pitch in the Eagle layout editor (without having to create a component).