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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
The I2C timeout error is usually because there isn't any communication between the device...
By the sound of it, you've connected SDA and SCL directly to the sensor (not through pwr-iso?). If so, try connecting the two GND lines on either side of pwr-iso - if the isolator is working correctly it'll be isolating ground, which means that just directly connecting the SDA and SCL won't be enough.