Make a simple soil moisture tracker with micro:bit, Via Makecode!
Connect a nail to the GND pin with a croc clip and insert it in the soil
Connect the other nail to the P0 pin with a croc clip and insert it in the soil
he soil acts as a variable resistor based on the amount of water and nutrient. The water is not conductive but the nutrient are, so more water, more nutrient, so the soil will be less resistive.
To measure this, we read the voltage on pin P0 using analog read pin which returns a value between 0 (no current) and 1023 (max current). The value is graph on the screen using led plot bar graph.
- insert the nails in the dry dirt and you should see most LEDs off
- insert the nail in the wet dirt and you should see most LEDs on
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