Auto-Calibrating Hydroponic Nutrient Doser – Master pH, EC & Dosing Automation with Arduino Mega

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

Maintaining perfect nutrient balance in a hydroponic setup by hand is tedious and error-prone. This kit lets you build a fully automated doser that reads EC, pH, and temperature, then triggers peristaltic pumps through relay logic to correct any drift. The Arduino Mega orchestrates sensor calibration, dosing schedules, and data logging — turning your grow tent or agri-lab into a self-regulating system.

What You'll Build

You will assemble a control unit that continuously monitors two DS18B20 waterproof probes, an analog pH module, and a TDS EC meter. The microcontroller runs a two-point calibration routine for both pH and EC at every startup, stores offset values, and uses a DS3231 RTC to trigger dosing cycles. A 0.96-inch OLED displays real-time readings and pump status, while an onboard microSD logs every event. The relay board interfaces with up to four external peristaltic pumps to adjust acid, base, and nutrient concentrations automatically.

What You'll Learn

• Implement two-point calibration for pH probes using buffer solutions and analog signal conditioning
• Convert TDS sensor output to EC with temperature compensation from DS18B20 data
• Program a 4-channel relay module to sequence peristaltic pumps with dead-time control
• Design a state machine on the Arduino Mega that reads sensors, logs to SD card, and updates the OLED without blocking

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

This advanced kit fits third‑year B.Tech students in ECE, EEE, or agricultural engineering looking for a capstone project. It’s equally suited for Smart India Hackathon teams working on precision agriculture, for IoT enthusiasts automating home hydroponic towers, and for ATL Tinkering Lab mentors who need a hardware‑intensive demonstration of closed‑loop control. The soldering and calibration demand prior Arduino experience, making it ideal for those who have already built a basic sensor project.

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.

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.