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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
Honestly what you've got there looks perfect.
And doing
D18.set()does nothing? Maybe you could check the voltages on each of the FET pins with a volt meter?Is it possible you could have wired the FET up wrong previously and blown it up?
I just wired up your circuit on breakboard, with that exact P36NF06L FET and the exact same water pump, running off a ~4v LiPo battey, and it works great.