The DS18B20 is a  temperature sensor that can be used in various simple projects.  This part uses the 1 wire  bus and you can connect multiple sensors up to your Espruino. The part is also relatively low cost and only requires an additional 4k7 pull up...

A light-dependent resistor is a light-controlled variable resistor. The resistance of a photoresistor decreases with increasing incident light intensity; in other words, it exhibits photoconductivity. A photoresistor can be applied.

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