Soil Sensor

141

01:06:30

Soil Sensor. The 3.3k sets the Vref threshold value. Lowering  resistance brings the threshold closer to Vcc. In this example roughly 300 ohms Measure the resistance of the soil in your watered plant at 1" depth, 1" spacing. Replace  the 3.3k resistor with a trim pot. The probes go between Vcc and the non-inverting input of the op-amp. Use the trim pot to set the dry point. I am not an electrical engineer, just an enthusiastic amateur who loves electronics. Just my personal solution to a project I'm working on. Suggestions are welcome!

published 7 years ago

kiani

7 years ago

My phone says " can' t find solution " ehen try ti operate the circuit. Is it csuse my phone doesn ' have a sole

scroft1042

7 years ago

LOL No i mis-labeled it. Supposed to be soil

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