Arduino Temperature Control Kit for Seedling Trays - Relay & LCD
Smart Seedling Warmer: Arduino DS18B20 Temperature Controller with Relay & LCD
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Create a precise electronic thermostat that toggles a heating pad to maintain the perfect warmth for seed germination trays. This project mimics industrial process control-the waterproof DS18B20 sensor reads temperature from the rooting zone, the Arduino compare it to your set point, and the relay switches a heater pad exactly like a boiler monitor in a food processing line, but scaled for your classroom or farm lab.
What You'll Build
A compact temperature controller with a backlit 16�2 LCD showing live measured temperature and the target set point. Two tactile buttons let you increase or decrease the target value on the fly. The relay output handles any 5V-230V load, so you can plug in a seedling heating mat or a small bulb. The unit keeps your germination tray within �0.5�C of the desired warmth using a simple hysteresis block that stops relay chatter, giving you a steady, even germination environment.
What You'll Learn
- Interface the DS18B20 waterproof digital sensor and read 12-bit temperature values with the DallasTemperature library
- Control a 5V relay module from Arduino to switch an external heater circuit safely
- Wire an I2C backpack to a 16�2 LCD, cutting pin count to just four wires and displaying real-time data
- Write an on/off control algorithm with adjustable set point, deadband, and button debouncing
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Uno R3 | 1 |
| DS18B20 Waterproof | 1 |
| 5V Relay Module | 1 |
| 16x2 LCD | 1 |
| I2C Backpack | 1 |
| Tactile Button | 2 |
| 1N4007 Diode | 5 |
| 4.7k? Resistors | 5 |
| 220? Resistors | 5 |
| 400-pt Breadboard | 1 |
| M-M Wires | 20 |
| 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 building their first Arduino project for school practicals, B.Tech ECE/EEE undergraduates prototyping a smart farming model, and Smart India Hackathon participants needing a quick and reliable temperature controller. The kit also fits ATL Tinkering Lab innovators and agri-tech enthusiasts who want a hands-on understanding of closed-loop heating systems used in nurseries and greenhouses.
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 open the AI companion, which walks you through every connection and code line. You can also message us on WhatsApp for human support during Indian business hours.
Can I use this kit to regulate a real seedling tray?
Absolutely. The waterproof DS18B20 probe goes directly into the soil or a water jacket. The relay switches any heating mat or bulb up to 250V AC, giving you lab-grade control for germination.
Does the kit include the heating pad?
No. The kit gives you the full control electronics. You can connect any off-the-shelf seedling heat mat, incandescent bulb, or resistor heater to the relay output-allowing you to scale the setup.
Can I power the Arduino from a USB power bank instead of a 9V battery?
Yes. The Arduino Uno runs on 5V USB. For standalone use, the included 9V battery snap keeps the thermostat running away from a computer, but a power bank is a convenient alternative.
Industrial Process - DS18B20 controls relay heater pad to hold seedling tray at target temperature. LCD shows temp and set point.
What's in this kit
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