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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
One other option is that the sensor (or your wiring) doesn't have 3.3v connected. DS18B20 can work off just data+GND, but I'm not 100% sure the driver for it supports that.
If your other code did support it, it'd still work. On Espruino it'd keep resetting, so the CRC would likely be wrong.