Root Zone Temperature Controller Kit with Arduino Uno + Relay
Root Zone Temperature Controller Kit with Arduino Uno & Relay – Automated Root Zone Heating
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Protect sensitive crops from root zone chilling with a closed-loop heating controller that reads three soil temperature probes at root depth and drives relay-activated warming mats. Designed for polyhouse nurseries, indoor vertical farms, and high-value herb cultivation, this kit transforms an Arduino Uno into a 24/7 root zone thermostat with time-stamped SD card data logging. You will calibrate DS18B20 digital sensors, program hysteresis-based relay logic, and assemble a weatherproof deployment unit.
What You'll Build
You will build a deployable root zone temperature controller that maintains a user-settable temperature band. Three stainless steel DS18B20 probes are inserted at root depth in separate grow zones; when the average temperature drops below the threshold, the Arduino energizes a 5V relay connected to a heating mat. The DS3231 real-time clock stamps every control event and temperature reading to a microSD card, while the 16x2 LCD with I2C backpack shows current soil temperatures and relay status. The entire circuit is soldered onto PCB prototype boards with noise-filtering components, ready to enclose in a field case.
What You'll Learn
- Interface and calibrate multiple DS18B20 1-Wire digital temperature sensors on a single Arduino pin
- Program hysteresis-based relay control logic to prevent rapid on/off cycling in soil warming systems
- Integrate a DS3231 real-time clock and microSD card module for time-stamped data logging of temperature and relay events
- Design and solder a noise-immune sensor interface board with diodes, resistors, and decoupling capacitors
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Uno R3 | 1 |
| DS18B20 Probe | 3 |
| 5V Relay Module | 2 |
| DS3231 RTC | 1 |
| MicroSD Module | 1 |
| 16x2 LCD | 1 |
| I2C Backpack | 1 |
| 1N4007 Diode | 5 |
| 4.7kΩ Resistors | 5 |
| 10kΩ Resistors | 5 |
| 100nF Caps | 10 |
| PCB Prototype Board | 2 |
| 9V Battery Snap | 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
B.Tech agricultural engineering and ECE students building precision irrigation and climate control prototypes for semester projects, Smart India Hackathon teams working on controlled-environment agriculture solutions, and polyhouse operators prototyping custom root zone heating controllers. It is equally suited for ATL tinkering labs and ICAR research stations wanting to teach embedded sensor systems in agri-tech.
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?
The AI build companion provides step-by-step wiring and code debugging for this kit. If you need a human, message us on WhatsApp with a photo of your board, and we’ll respond within hours.
Can the controller manage two independent heating zones?
Yes, the two relay modules can drive separate heating mats based on temperature readings from assigned probes, with independent thresholds programmed in the Arduino sketch.
Is the soldering iron and solder wire enough to assemble the PCB board?
Absolutely. The included 25W soldering iron and lead-free solder wire are chosen for through-hole components on the prototype boards. We recommend a well-ventilated workspace and our AI companion walks you through each joint.
How do I protect the electronics in a high-humidity grow room?
The build guide explains how to conformally coat the solder joints and house the controller in a sealed IP65 enclosure (not included) with cable glands for the probe and relay wires, making it suitable for humid environments.
DS18B20 probes at root depth control relay heating mat to maintain optimal root temperature band.
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