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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.
@Jean-Philippe_Rey
I suspect that the kind of sensor that J{a}SON is using is this one: http://wiki.seeedstudio.com/Grove-Temperature_and_Humidity_Sensor_Pro/
If true, It is probably discussing through I2C, which cannot be the case of the sensor of @furuskog, which has only 3 pins (I2C would have at least 4 pins)