SMART PID TEMPERATURE CONTROL SYSTEM WITH RELAY OUTPUT AND LCD DISPLAY
Jitendra Gaikwad, Pratima Patil, Vivek Patil, Punam Dhangar
Department of Instrumentation Engineering, Vishwakarma Institute of Technology, Pune, India
ABSTRACT: In this project, an ESP32 microcontroller is used to construct a PID-based temperature control system. In order to maintain a user-defined setpoint, the system automatically controls a relay-driven heater after continuously measuring the temperature using a DS18B20 digital sensor. While a Wi-Fi-enabled web interface enables live monitoring and change of setpoint and PID parameters (Kp, Ki, Kd), a 16×2 LCD display provides real-time feedback of temperature, setpoint, and relay condition. Smooth heating, little overshoot, and steady temperature control are guaranteed by the PID controller. System reliability is improved by safety features such a cutoff at 70°C and EEPROM storage for setpoints and PID parameters. The efficacy of PID implementation on a low-cost microcontroller platform is validated by experimental results that show accurate and responsive temperature management.
Keywords- PID Controller, Temperature Control, ESP32, DS18B20, Relay Module, LCD Display, I2C, Embedded System, Microcontroller, Time-Proportional Control
VOLUME 10 ISSUE 03 2026: 242 – 248