Build a Precise PID Temperature Controller with Arduino Uno & Relay – Holds Setpoint Within 0.5°C

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

Turn your desk into a control‑systems lab with a feedback‑based thermal regulator that learns from its own output. The DS18B20 digital probe feeds live temperature data into an Arduino Uno running a full PID loop; the algorithm decides how long the relay should fire to nudge a heater toward your chosen setpoint. Within an hour of soldering‑free assembly you’ll see the LCD report stable readings that stay locked to within half a degree—the same logic used in industrial ovens, 3D‑printer hotends and egg incubators.

What You'll Build

You’ll wire an Arduino Uno to a waterproof DS18B20 sensor, a 5 V relay module and a 16×2 LCD over I2C. Once the code is uploaded, the display shows current temperature, setpoint and relay status in real time. Press the tactile buttons to raise or lower the target; the PID constants you tune will automatically balance overshoot and settling time so your load stays exactly where you want it.

What You'll Learn

• Implement a complete PID control loop in Arduino C++, handling proportional, integral and derivative terms
• Interface the DS18B20 1‑Wire temperature sensor and parse its digital output with the DallasTemperature library
• Drive a 16×2 character LCD through an I2C backpack, reducing pin usage to just two wires
• Tune Kp, Ki and Kd gains experimentally to achieve sub‑0.5 °C steady‑state accuracy with a resistive heater

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

If you’re a CBSE Class 11–12 student preparing a physics or computer‑science investigatory project on thermal control, or a B.Tech ECE/EEE sophomore who needs a hands‑on closed‑loop demo, this kit gives you a working reference design. It also fits neatly into Smart India Hackathon environment‑monitoring prototypes and ATL Tinkering Lab sessions where mentors want a reliable controller that demonstrates real‑world algorithm tuning.

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.