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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
Hi! Which Espruino board are you using? And do you have a link to the accelerometer breakout?
I2C write error is usually because the chip isn't responding - so wrong address, or not wired up right.
It may be that your breakout board doesn't have any pullup resistors on I2C so you could try adding some ~10k resistors to each of the 2 lines.
Of course it's probably a combination of things, so after you added the pullups I'd try setting addr:0x18 as well in case it was the different address that was the issue.