Multi-Crop Soil NPK Estimator Kit with Arduino Uno + Sensor
Build a Multi-Crop Soil NPK Estimator with Arduino Uno
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Farmers, agri-students, and IoT enthusiasts can now move beyond guesswork when it comes to soil health. By placing three moisture sensors at different depths, this kit proxies nitrogen, phosphorus, and potassium availability through conductivity trends. The Arduino Uno crunches the numbers while a crisp OLED instantly recommends the right crop or fertilizer — all without a smartphone, lab, or internet connection.
What You'll Build
You’ll wire three soil moisture sensors to an Arduino Uno on a breadboard, mount a 0.96-inch OLED, and upload the code that turns raw sensor data into actionable farming intelligence. The handheld unit compares readings against stored profiles for wheat, rice, maize, and common vegetables, displaying which nutrient the soil lacks and whether to add urea, DAP, or potash.
What You'll Learn
- Calibrating multiple soil moisture sensors for proxy NPK measurement
- Mapping conductivity and moisture to nitrogen, phosphorus, and potassium levels
- Programming an OLED to show dynamic crop recommendations
- Building a portable, breadboard-based field prototype
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Uno R3 | 1 |
| Soil Moisture Sensor | 3 |
| 0.96in OLED | 1 |
| 10kΩ Resistors | 10 |
| 100nF Capacitors | 5 |
| 400-pt Breadboard | 1 |
| Male-to-Male Jumper Wires | 25 |
| 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
CBSE Class 11–12 students turning agriculture into a working physics and electronics project, B.Tech ECE/EEE undergraduates prototyping for Smart India Hackathon or final-year submissions, and ATL Tinkering Lab innovators exploring precision farming. Agri-entrepreneurs testing low-cost soil diagnostics will also find a ready-to-iterate platform here.
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 kit box to chat with the AI companion trained on this exact project. It can spot wiring mistakes, explain code blocks, and guide sensor calibration. For human support, reach us on WhatsApp.
Can I use this kit for different soil types and crops?
Yes. The AI companion includes calibration routines for sandy, clay, and loamy soils, and comes with pre-loaded profiles for wheat, rice, maize, and common vegetables. You can also create custom profiles by logging sensor readings from your own fields.
How accurate is the NPK estimation compared to a lab test?
The kit provides proxy estimates based on moisture and conductivity correlations. While it will not replace a lab-grade soil test, it reliably highlights relative nutrient differences and helps make immediate fertilizer decisions in the field.
Do I need prior electronics or coding experience?
Not at all. The build is designed for ages 15 and up, and the AI companion walks you through every connection and line of code. Familiarity with the Arduino IDE speeds things up, but step-by-step instructions are included.
Three soil sensors proxy NPK levels using conductivity and moisture correlations. Recommendations on OLED.
What's in this kit
- Arduino Uno R3
- Soil Moisture Sensor x3
- 0.96in OLED
- 10kΩ Resistors x10
- 100nF Caps x5
- 400-pt Breadboard
- M-M Wires x25
- 9V Battery Snap
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