Design And Construction Of A Digital Temperature Sensor Circuit System Using Arduino LM35

ABSTRACT
Temperature measurement is vital step in various applications, whether it is used in industries, weather studies, medicinal field or scientific research. Excessive rise in temperature can cause components or equipment damage. In order to avoid this a digital temperature sensor was built through which one can monitor temperature. In this project, we interfaced LM35 Temperature Sensor with Arduino to design a digital thermometer. The measured temperature will be directly displayed on a 16*2 LCD. LM35DZ is capable of reading the temperature in Centigrade scale. The output voltage of the sensor is directly proportional to the temperature in centigrade. LM35 can be used in the range of -55°C to +150°C with +/- 0.75°C accuracy. The main aim of this work is to build a digital temperature sensor using arduino and LM35 sensor.

TABLE OF CONTENTS
TITLE PAGE
APPROVAL PAGE
DEDICATION
ACKNOWLEDGEMENT
ABSTRACT
TABLE OF CONTENT
CHAPTER ONE
1.0 INTRODUCTION
1.1 OBJECTIVE OF THE PROJECT
1.2 SIGNIFICANCE OF THE PROJECT
1.3 APPLICATION OF THE PROJECT
1.4 SCOPE OF THE PROJECT
1.5 PROBLEM STATEMENT
1.6 PURPOSE OF THE PROJECT
CHAPTER TWO
2.0 LITERATURE REVIEW
2.1 OVERVIEW OF TEMPERATURE CONTROLLER
2.2 REVIEW OF DIFFERENT TYPES OF TEMPERATURE CONTROLLER AND THEIR WORKING PRINCIPLE
2.3 DEFINITION OF TEMPERATURE SENSOR
2.4 TYPES OF TEMPERATURE SENSORS

CHAPTER THREE
3.0 DESIGN METHODOLOGY
3.1 SYSTEM BLOCK DIAGRAM
3.2 SYSTEM CIRCUIT DIAGRAM
3.3 CIRCUIT WORKING PRINCIPLE
3.4 CIRCUIT COMPONENTS THEORY
3.5 SYSTEM CODE
CHAPTER FOUR
4.0 CONSTRUCTION PROCEDURE AND TESTING
4.1 CASING AND PACKAGING
4.2 ASSEMBLING OF SECTIONS
4.3 TESTING OF SYSTEM OPERATION
4.4 PROBLEM ENCOUNTERED
CHAPTER FIVE
5.1 CONCLUSION
5.2 RECOMMENDATION
5.3 BIBLIOGRAPHY

CHAPTER ONE
1.0 INTRODUCTION
The main purpose of this Digital Temperature sensor is to indicate or display the temperature of a device such as incubator or any other device like AC or any other electronic devices whose temperature keeps fluctuating and thus requires a constant watch on the device. The use of this system eliminates constant watching on the device by self controlling the temperature of the system.
Temperature control indicator it is an apparatus consisting of a box designed to maintain a constant temperature by the use of a thermostat; used in incubators for chicks or premature infants. In the business world, temperature indicator used in incubator is an enterprise that is set up to provide office space, equipment, and sometimes mentioning assistance and capital to new businesses that are just getting stated. (the tem is familiar in poetry farming, where an incubator is a specially – equipped home for baby chickens)> business incubators are set up by universities, non-profit groups, and increasingly by venture capitalists, especially for new web businesses.
Our proposed project consists of digital temperature sensors for more accurate temperature display. This system overcomes the disadvantages of thermostat/analog systems in terms of accuracy.
This work is on building a temperature display using arduino and a 16×2 LCD module which constantly monitors temperature around the measurement field/range of LM35 and displays the same on LCD module. The system uses a digital temperature sensor in order to detect temperature and pass on the data to the arduino. The arduino processes data and sends the temperature to be displayed on LCD screen.
1.3 AIM AND OBJECTIVES OF THE PROJECT
The main aim of this work is to build a digital temperature sensor using arduino and LM35 sensor.
The objectives of this project are:
1 To build a temperature sensor.
2 To analyses the performance of the controller.
3 To displayed a real-time temperature on a LCD screen.

1.4 PROBLEM STATEMENT

The problem happens when temperature control devices such as incubator is still functioning although in the event of cold weather. The function is uncontrolled and must be manually turned on and off. Sometimes it can lead to high usage of electricity which in turn raises the electricity bill when the user forgot to switch it off. The system also does not have the capacity to indicate in order to adjust the room temperature regardless of the ambient temperature. To address the problem, the temperature control indicator that can indicate the temperature automatically is proposed. The advantages of such a system are less energy usage, and provides more convenient to the consumers.
1.5 PURPOSE OF THE PROJECT
The main purpose of this Digital Temperature sensor is to display the temperature of devices such as incubator or any other electronic devices like oven whose temperature keeps fluctuating and thus requires a constant watch on the device.
1.6 SCOPE OF THE PROJECT
Below are the scopes of the project:
This study provides an opportunity to learn using sensors to measure the real world signals that are analog in nature. This work is based on a arduino microcontroller and an LM35 temperature sensor. LM35 is an analog sensor that converts the surrounding temperature to a proportional analog voltage. The computed temperature is displayed in a 16×2 character LCD, in both °C and °F scales.
1.7 APPLICATION OF THE PROJECT
this device can be used for temperature control electrical appliances such as:
i. Air conditioner
ii. Refrigerator
iii. Fan,
iv. Furnace etc.