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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.
@ClearMemory041063
Here's one idea for a soil moisture sensor:
http://www.irrometer.com/pdf/research/DROUGHT_WEB_RESIS_BLOCKS-UC%20DAVIS_Drought_Management.pdf