MISSION 17
Moisture Sensor for Your Plants
Plants provide oxygen, they look good, and they smell great. Plants are cool. To keep my plants alive, I’m going to create a sensor that checks whether the soil inside my potted plants is moist.
When soil is wet, it conducts electricity! So we can use the micro:bit and the Circuit Playground Express to keep an eye on the moistness level of our potted plant soil. Try to say this three times: “potted plant soil, potted plant soil, potted plant soil.”
Instead of using the digital read pin, we’re going to use analogue read. Digital read returns either 1 or 0, true or false. I’d like to know how wet/dry my soil is. I want a range of numbers. Analogue read returns a range of numbers. Both the micro:bit and ...
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