Rain / Water-drop Sensor Board
by Generic
SKU: PSA-CMP-RAIN
No reviews yetTypical India street price
₹40–₹90
PCB traces as a wetness detector — monsoon and irrigation labs.
Interface: Analog + digital comparator
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Concept
Water lowers resistance between interlaced copper traces.
A little theory
Conductivity path + LM393 comparator. Analog falls as drops collect; DO flips at the pot threshold. In the classroom, treat Rain / Water-drop Sensor Board as a beginner part using Analog + digital comparator. Typical India street price is about ₹40–₹90. 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
Mount traces exposed to sky/soil splash; analogRead + calibrate dry vs wet.
Classroom & project use
- Clothes-line alarm
- Smart irrigation lockout
- Flood toy
Buying in India
Precautions
- Not food-safe
- DC electrolysis pits the traces — don’t leave powered wet for days
Specifications
| Output | AO + DO |
| Category | Sensors |
| Difficulty | Beginner |
| Voltage | 3.3–5V |
| Interface | Analog + digital comparator |
Pinout
VCC | GND | AO (and DO if comparator module)
