Water Hardness Conductivity Test Kit with Arduino Uno
Measure Water Hardness and TDS with Arduino Uno – A Complete Hands-On STEM Kit
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Discover what’s really in your drinking water. With this kit, students and hobbyists transform an Arduino Uno into a portable TDS (Total Dissolved Solids) and conductivity meter. Simply dip the sensor into tap water, well water, or a lab sample and see the dissolved mineral concentration appear on a bright LCD. It’s a perfect blend of electronics, chemistry, and environmental science — all on a breadboard.
What You'll Build
You’ll assemble a functional water quality tester that reads electrical conductivity and displays TDS in parts-per-million along with a soft/hard classification. The DS18B20 waterproof temperature sensor automatically compensates readings, making your results consistent even as water warms or cools. Place the device in a project box or mount it on a display board for your next science exhibition.
What You'll Learn
- Read an analog TDS/EC sensor and convert voltage to ppm using Arduino code
- Interface a DS18B20 1-wire temperature sensor for automatic compensation
- Drive a 16x2 LCD with an I2C backpack to display real-time readings
- Interpret water quality data and classify samples as soft, moderately hard, or hard
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Uno R3 | 1 |
| TDS EC Meter | 1 |
| DS18B20 Waterproof | 1 |
| 16x2 LCD | 1 |
| I2C Backpack | 1 |
| 4.7kΩ Resistors | 5 |
| 10kΩ Resistors | 5 |
| 400-pt Breadboard | 1 |
| M-M Wires | 20 |
| 9V Battery Snap | 1 |
Why Buy This Kit Instead of Sourcing Parts Separately
| Factor | Sourcing Separately | Compoden Kit |
|---|---|---|
| Compatibility checks | You verify every part | Pre-tested as a system |
| Build support | Forums and scattered tutorials | AI companion trained on this exact project |
| Time to first working build | Days of debugging | Hours, with step-by-step guidance |
| Shipping coordination | Multiple sellers, multiple delays | One shipment from Bengaluru in 3-5 days |
Who This Kit Is For
Designed for CBSE Class 5–12 students exploring environmental monitoring, ATL Tinkering Lab mentees prototyping water-testing solutions, and parents looking for a screen-free coding activity with real-world purpose. B.Tech ECE/EEE first-years also use it to solidify sensor integration basics.
Built and Backed by Compoden
Every Compoden kit ships with an AI build companion trained on this exact project — accessible via a QR code on the box, with WhatsApp and email backup. We've spent 10 years building projects for makers, schools, and institutions across India. If a part fails because of a manufacturing defect, replace it free within 7 days.
What if I get stuck during the build?
Scan the QR code on the box to chat with your AI companion that knows every wire connection. If you prefer a human, our WhatsApp support responds within hours.
Can I test tap water, RO water, and well water?
Yes. The TDS EC sensor detects dissolved salts and minerals in any non-corrosive water sample. You’ll see clear numeric differences between soft (e.g., RO) and hard (e.g., borewell) water on the LCD.
Is any soldering required?
No. All connections are made on the included breadboard with pre-cut M-M wires, so you can assemble and disassemble the project without tools.
How do I calibrate the sensor for accurate TDS readings?
The AI companion will walk you through a simple one-point calibration using a known TDS solution or distilled water, plus temperature compensation via the DS18B20 to keep measurements consistent.
TDS EC sensor measures dissolved minerals in different water samples. Compare soft vs hard water.
What's in this kit
Other projects you can build
Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items