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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.
@myownself
Aah, I wondered why the barometer app didn't draw hands for me.
The pressure sensor isn't calibrated and there isn't way to calibrate it yet, but it wouldn't be a one off thing anyway. There are some interesting summaries about accuracy of GPS vs. Pressure altitude on gliding/flying websites.