This microcontroller-based project monitors and controls refrigerator temperature using a temperature sensor. The sensor checks the temperature every few minutes and turns the refrigerator off if it decreases below a set limit. It displays the real-time temperature on an LCD screen and sounds a buzzer alert when the door is opened. The major components are a temperature sensor, ADC, microcontroller, door sensor, LCD display and buzzer.

1. Micro controller based refrigeration control system
The main purpose of the project is to monitor and control the Refrigerator
temperature by using a temperature sensor. This sensor monitors the temperature of the
refrigerator for every few minutes; if the temperature of the refrigerator decreases the
limit then it automatically turns OFF the device.
Temperature Monitoring systems are in huge requirement and we definitely can
find their advantages in many industrial sector and also in residential sector. We can find
many kind of temperature monitoring systems for different uses but the major challenge
is to design a very simple, User-friendly and cost effective system.
We developed this project, which is relatively inexpensive to sense the
temperature. The temperature is read by the ADC (Analog to Digital Converter) module
of the microcontroller Unit. This ADC data is processed and converted into the actual
temperature reading by the microcontroller. This processed data is sent to the LCD for
user display.
The door-opening sensor is also interfaced with the controller when the door of
the refrigerator is opened then it senses and it gives a buzzer alert.
The objectives of the project include:
1. Read the temperature in real-time.
2. A buzzer for alerts.
3. LCD display.
www.mycollegeproject.com Ph: +91 9490219339, 040-23731030
Ameerpet: A-8, 2nd floor, Eureka court, beside Image hospital, Ameerpet, HYDERABAD 73.
Santoshnagar: Opp: Magna Hypermarket, Santoshnagar X-Roads,HYDERABAD – 59.

2. The project provides us exposure on:
1. Initialization of ADC module of microcontroller.
2. Interfacing Temperature sensor to controller.
3. LCD interfacing.
4. Embedded C program.
5. PCB designing.
The major building blocks of this project are:
1. Regulated power supply with voltage regulator.
2. Temperature sensor.
3. ADC module.
4. Microcontroller.
5. Door opening sensor.
6. LCD display
7. Buzzer.
Software’s used:
1. PIC-C compiler for Embedded C programming.
2. PIC kit 2 programmer for dumping code into Microcontroller.
www.mycollegeproject.com Ph: +91 9490219339, 040-23731030
Ameerpet: A-8, 2nd floor, Eureka court, beside Image hospital, Ameerpet, HYDERABAD 73.
Santoshnagar: Opp: Magna Hypermarket, Santoshnagar X-Roads,HYDERABAD – 59.

3. Regulated Power Supply:
Block diagram:
www.mycollegeproject.com Ph: +91 9490219339, 040-23731030
Ameerpet: A-8, 2nd floor, Eureka court, beside Image hospital, Ameerpet, HYDERABAD 73.
Santoshnagar: Opp: Magna Hypermarket, Santoshnagar X-Roads,HYDERABAD – 59.

4. www.mycollegeproject.com Ph: +91 9490219339, 040-23731030
Ameerpet: A-8, 2nd floor, Eureka court, beside Image hospital, Ameerpet, HYDERABAD 73.
Santoshnagar: Opp: Magna Hypermarket, Santoshnagar X-Roads,HYDERABAD – 59.