This project is designed to monitor and control the temperature of a refrigerator using a temperature sensor and a microcontroller. The sensed temperature is continuously compared with a preset value, and the refrigeration unit is automatically turned ON or OFF to maintain the desired temperature. The system is powered by solar, wind and hydel, making it energy-efficient and environmentally friendly. A thermoelectric (Peltier) plate is used for cooling, and both the current and preset temperature values are displayed on an LCD screen. The project is simple, low-cost, and suitable for refrigeration and other temperature control applications.          

Objectives:  

• To design a hybrid renewable energy system using solar, wind, and hydel power sources for operating a refrigeration unit.
• To monitor the refrigerator temperature continuously using a temperature sensor and microcontroller.
• To maintain the desired temperature automatically by controlling the refrigeration system based on preset temperature limits.
• To reduce electricity consumption by utilizing renewable energy sources instead of conventional grid power.
• To develop a low-cost, eco-friendly, and energy-efficient refrigeration system suitable for domestic and rural applications.

           

The major building blocks of this project are:  

1. Regulated power supply.
2. Temperature sensor.
3. Solar Panel
4. Microcontroller.
5. Reset Button
6. Crystal
7. Wind Turbine.
8. Hydel turbine
9. Thermo electric plate
10. Relay
11. LCD display.

       

Software’s used:  

1. PIC-C compiler for Embedded C programming.
2. PIC kit 2 programmer for dumping code into Microcontroller.
3. Express SCH for circuit designing.

         

Regulated Power Supply:

                 

Block Diagram:              

video: