TDS Water Quality Probe (analog)
by Keyestudio / clone
SKU: PSA-CMP-TDS
No reviews yetTypical India street price
₹250–₹550
Total dissolved solids estimate for water-quality STEM.
Interface: Analog
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Concept
AC excitation of two electrodes → conductivity → TDS ppm (approx).
A little theory
TDS ≈ k × EC. Temperature compensation helps. Not ion-specific. In the classroom, treat TDS Water Quality Probe (analog) as a intermediate part using Analog. Typical India street price is about ₹250–₹550. 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
Gravity TDS example code; calibrate with 1413 µS standard if you have it.
Classroom & project use
- RO vs tap demo
- Hydroponics EC rough
- Sensors classroom demo
Buying in India
Precautions
- Share a common GND with the microcontroller
- Verify polarity and voltage before powering the circuit
Specifications
| Output | Analog |
| Unit | ppm estimate |
| Category | Sensors |
| Difficulty | Intermediate |
| Voltage | 3.3–5V |
| Interface | Analog |
Pinout
VCC | GND | AO (and DO if comparator module)
