GPS & Soil EC-Based Variable Rate Spreader Controller Kit with ESP32 - Apply Fertilizer Only Where Your Soil Needs It

Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.

Variable rate fertilizer application is no longer limited to large-scale farms. This kit lets you build an ESP32-based controller that reads GPS and soil EC, then opens a relay via PWM matching pre-loaded prescription maps on a microSD card - putting precision nutrient management directly in your hands.

What You'll Build

A self-contained control unit that tracks spreader position via GPS, samples soil EC with a TDS meter, and adjusts motor speed through a MOSFET using PWM. An OLED displays coordinates, EC values, and active rate. Housed in a waterproof enclosure for field deployment.

What You'll Learn

• Interfacing GPS modules and parsing NMEA sentences
• Reading CSV prescription maps from microSD and real-time comparison
• Generating PWM signals through a MOSFET to control motors
• Measuring soil EC with a TDS meter and mapping to prescription zones

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Pet - GPS and soil EC map guide variable rate spreader relay opening via PWM to match pre-loaded prescription map.

What's in this kit

• ESP32 Dev Board
• NEO-6M GPS
• TDS EC Meter
• DS3231 RTC
• MicroSD Module
• IRF540N MOSFET
• LM2596 Buck Converter
• 0.96in OLED
• 100nF Caps x10
• 4.7k? Resistors x5
• PCB Prototype Board x2
• Waterproof Enclosure
• 12V PSU
• Soldering Iron
• Solder Wire

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.