The Soil Moisture Sensor is a low-cost resistive sensor with a fork probe and an LM393 comparator board. It gives an analog value for moisture level and a digital output when the soil becomes dry, with the threshold set by a potentiometer – perfect for simple plant watering systems.
| Sensing | Resistive fork probe |
|---|---|
| Comparator | LM393 |
| Supply voltage | 3.3V – 5V |
| Output | Analog (AO) + Digital (DO) |
| Adjustment | Potentiometer for dry/wet threshold |
What is the operating voltage?
3.3V – 5V.
Why does the probe corrode?
Resistive probes corrode with constant current; power it only while reading, or use the capacitive sensor.
Can I buy the Soil Moisture Sensor for Arduino & ESP boards in Kanpur?
Yes – buy online with delivery across India, or pick it up from the iTechBuilders store, Damodar Nagar, Kanpur.
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