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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
Yes, BME280 seems good - DS18B20 is the classic digital temperature sensor but they're actually surprisingly pricey.
@RolandGalibert yes, that's correct. I believe the actual change the value based on temperature is really pretty reliable, it's just that the 'base' value changes from chip to chip and isn't calibrated at the factory - so just adding/subtracting a single value should sort things out for you.