Precision Agriculture GPS & Soil EC Variable Rate Control Kit
Precision Agriculture Variable Rate Spreader Controller - ESP32, GPS & Soil EC
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Build a GPS-accurate variable rate controller that reads a pre-loaded soil EC prescription map from an SD card and adjusts a PWM-driven relay to open a spreader precisely where the map dictates. This system directly addresses the needs of smart farming - applying inputs only where soil data says they are required, reducing waste and improving crop uniformity.
What You'll Build
You will assemble a field-deployable control box that mounts on a tractor or spreader. As the vehicle moves, real-time GPS coordinates are compared against a geo-referenced soil EC map. The ESP32 calculates the appropriate PWM duty cycle and triggers an IRF540N MOSFET to modulate the spreader relay, achieving true variable rate application. The OLED displays current location, EC zone, and output status, and all data is logged with timestamps on the MicroSD card for post-operation analysis.
What You'll Learn
- Fusing real-time GPS with soil electrical conductivity data for on-the-go input decisions
- Designing PWM-driven actuator control loops that respond to geospatial parameters
- Parsing multi-zone prescription maps from an SD card and synchronizing log timestamps via DS3231 RTC
- Building a weather-resistant 12V power supply with buck regulation for consistent field operation
Kit Contents
| Component | Quantity |
|---|---|
| ESP32 Dev Board | 1 |
| NEO-6M GPS | 1 |
| TDS EC Meter | 1 |
| DS3231 RTC | 1 |
| MicroSD Module | 1 |
| IRF540N MOSFET | 1 |
| LM2596 Buck Converter | 1 |
| 0.96in OLED | 1 |
| 100nF Caps | 10 |
| 4.7k? Resistors | 5 |
| PCB Prototype Board | 2 |
| Waterproof Enclosure | 1 |
| 12V PSU | 1 |
| Soldering Iron | 1 |
| Solder Wire | 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
Agritech engineers, precision agriculture startups, and B.Tech Agri-Engineering students from institutions like IIT Kharagpur or VIT who need a practical variable rate application demonstrator. It also supports Smart India Hackathon teams focused on farm mechanization, as well as ATL Tinkering Lab mentors guiding advanced soil-sensing projects. The 25+ age group will find the PCB assembly and field calibration routines match their professional pace.
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?
Our AI companion walks through each connection, and you can send a WhatsApp message for direct engineer support.
Can I load my own prescription map?
Yes, the SD card stores a GeoJSON file you can generate from any GIS software; the AI guide shows how to format it.
What type of spreader relay works with this?
The MOSFET can drive any 12V solenoid up to 10A; it matches most granular or liquid variable rate spreaders.
Is a constant internet connection required in the field?
No. The NEO-6M GPS works offline, and all mapping and control logic runs locally on the ESP32.
Vehicle - GPS and soil EC map guide variable rate spreader relay opening via PWM to match pre-loaded prescription map.
What's in this kit
Choose your assembly option:
- Soldering Kit - 25W soldering iron, 60/40 solder wire, flux, and small perfboard for permanent assembly.
- Breadboard Combo - 800-point full-size breadboard with 65-piece jumper wire pack for solderless prototyping.
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