Capacitive Soil Moisture Sensor v2.0
by Generic
SKU: PSA-CMP-SOIL
No reviews yetTypical India street price
₹50–₹110
Measures soil water without two exposed metal probes corroding.
Interface: Analog
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Concept
Soil + water changes capacitance around a PCB probe; a 555-style circuit converts that to analog voltage.
A little theory
Water has high dielectric constant. More moisture → higher capacitance → different frequency/voltage. In the classroom, treat Capacitive Soil Moisture Sensor v2.0 as a beginner part using Analog. Typical India street price is about ₹50–₹110. Always verify voltage and pin labels on your exact module — silk screens vary across clones. Start with a datasheet or trusted learn guide, power the part correctly, share GND with the MCU, and test with a simple blink/read sketch before building the full project. Measure voltages with a multimeter when something fails, and keep actuator current off the MCU regulator.
How it works in a project
Insert up to the line, read analog. Calibrate dry vs wet for your soil.
Classroom & project use
- Auto plant watering
- Farm IoT intro
- Sensors classroom demo
Buying in India
Precautions
- Do not immerse electronics; only the probe
- Seal the PCB edge if used outdoors
Specifications
| Output | Analog ~1.5–3 V |
| Interface | 3 pin |
| Category | Sensors |
| Difficulty | Beginner |
| Voltage | 3.3–5V |
Pinout
VCC | GND | AO (and DO if comparator module)
