Design and Implementation of a Microcontroller-Based Temperature Control and Monitoring System for Refrigerated Trucks

The transportation of pharmaceuticals and perishables through the cold chain requires strict temperature control. This paper presents a compact and affordable overheat detection and control system using the ATmega328 microcontroller. The system tracks the internal temperature through the LM35 sensor while showing readings on an OLED display and triggering a buzzer when temperatures reach 10°C. The Peltier module functions as a cooling mechanism to bring the chamber temperature back within its desired range. The system provides an excellent solution for small refrigerated trucks and containers in mobile medical and food logistics operations because it offers portability, real-time feedback, and autonomous operation.