CLIMATE CONTROL SYSTEM FOR AIR CONDITIONER. Assistant Professor/EIE

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1 Volume 119 No , ISSN: (on-line version) url: CLIMATE CONTROL SYSTEM FOR AIR CONDITIONER 1 M.Kalaiyarasi, 2 A.Jagadeesan, 3 R.Dhanasekar Assistant Professor/EIE 1 Bannari Amman Institute of Technology, Sathyamangalam Sathyamangalam, Erode,India 2Associate Professor/EIE Bannari Amman Institute of Technology, Sathyamangalam Sathyamangalam, Erode,India Assistant Professor/EIE 3 Bannari Amman Institute of Technology, Sathyamangalam, Erode, India 1 kalaiyarasime@gmail.com, 2 mails4jagan@gmail.com, 3 dhanasekar1693@gmail.com ABSTRACT: According to its requirement for any industrial application the practical temperature controller controls temperature of any area. It also displays the temperature on an LCD display in the range of 55 C to +125 C. The heart of the circuit is a NodeMcu board which controls all its functions. A DHT11 sensor is used as temperature and humidity sensor. The DHT11 temperature device is interfaced to the pin of the NODEMCU board, through its built-in ADC, which converts these reading and displays that on the LCD, to indicate temperature of the device. The push buttons in the NODEMCU board the user defined temperature settings can be done. Few push buttons are used to set the temperature by increment (INC), for increase and decrement (DEC) for decrease settings. According to the measured temperature NODEMCU program generates PWM output on the corresponding digital output while setting the max and min temperatures as soon as earlier. Through a motor driver IC this output is fed to a DC fan. If the fan speed increases then the temperature measured is also increases. Through a controller the standard power supply of 12 volt DC and 5 volt can be from a stage down transformer alongside a scaffold rectifier and channel capacitor. According to the room temperature the control of DC fan speed and show these parameter changes on a 16x2 LCD display and also controlled through internet of things. By using the PWM it is accomplished that the data communications between NodeMcu, LCD, DHT11 sensor Module and DC fan that is controlled. The voltage can be controlled by using the PWM technique. Keywords: Controls temperature, LCD, DHT11 Sensor, NODEMCU, Control by IOT, PWM I.INTRODUCTION Adaptive temperature change is required these days commercially and in industry also In commercial models like room air conditioner the temperature must be maintained during sleeping hours whereas in industry like data storage unit the optimum temperature has to maintained for better performance of data storage and these have various thermal application there is no monitoring of heat with respect to environment. Thus by using this project the temperature can be controlled and maintained according to the requirement whereas the unwanted wastages of energy can be reduced. Though the sensors used in this project can be functioned in an effective way thus it takes the readings as per temperature of the given environment that particular environment can be maintained as per the given temperature range of the user. In this modern era, technologies are growing better and faster. Everything is getting more sensible and automated. Microcontroller assumes critical part in making this more astute. Microcontroller has turned into the savvy advancements. It is a solitary chip microchip which controls and computerizes machines and 4507

2 procedures. The chip is used to execute the code on the given board. Microcontroller as a rule comprise of Central Processing Unit (CPU), clocks and counters, intrudes on, memory, input/yield ports, simple to computerized converters (ADC) on a solitary chip. This project presents the output of the Air cooler chillness using IoT and Sensor. A temperature sensor LM35 is used which senses the temperature change and Humidity of the atmosphere so that to control the chillness of the air cooler accordingly. The project is based on the controlling of refrigerator system with the accordance variation in temperature and humidity of the environment using embedded system and internet of things. Utilization of implanted innovation influences this shut circle criticism to control framework productive and solid. The microcontroller (MCU) ATMega8/168/328 permits dynamic and quicker control and the LCD makes the framework easy to understand. II.SYSTEM MODEL AND ITS FUNCTIONS This Block Diagram consists of Temperature Sensor, Arduino, Relay and Lcd 16X2. Here the Temperature Sensor is LM35 generates a small voltage corresponds to the temperature across IC (1). Arduino (ATmega8) as a controller. Arduino Uno sends out data for displaying on 16x2 LCD. Block diagram of Temperature Control is shown in figure1. The temperature and humidity combined together can be effectively sensed by DHT11 Humidity and temperature sensor. ARDUINO UNO for building computerized gadgets and intelligent items that can detect and control protests in the physical world. models, which are likewise utilized for stacking programs from PCs. The microcontrollers are commonly modified utilizing a tongue of highlights from the programming dialects C and C++. Notwithstanding utilizing conventional compiler toolchains, the Arduino venture gives a coordinated improvement condition (IDE) in view of the Processing dialect venture. III.CIRCUIT DIAGRAM The Arduino stage has turned out to be very prevalent with individuals simply beginning with hardware, and all things considered. Dissimilar to most past programmable circuit sheets, the Arduino does not require a different bit of equipment (called a software engineer) keeping in mind the end goal to stack new code onto the board you can essentially utilize a USB link. Also, the Arduino IDE utilizes a disentangled form of C++, making it less demanding to figure out how to program. At last, Arduino gives a standard shape factor that breaks out the elements of the small scale controller into a more open bundle. Most Arduino sheets contain a light-discharging diode (LED) and a heap resistor associated between stick 13 and ground, which is a helpful element for some tests and program capacities. Circuit diagram of temperature monitoring and controlling system is shown in figure 2. A typical program for a beginning Arduino programmer blinks a LED repeatedly. This program utilizes the capacities pinmode(), digitalwrite(), and deferral(), which are given by the interior libraries incorporated into the IDE condition. The program is usually loaded in the Arduino by the manufacturer. Humidity Sensor (DHT11) Power supply ARDUINO Motor Liquid Crystal Display Figure.1 Block diagram of Temperature Control The sheets are outfitted with sets of advanced and simple info/yield (I/O) sticks that might be interfaced to different development sheets (shields) and different circuits. The sheets highlight serial correspondences interfaces, including Universal Serial Bus (USB) on a few Figure 2 Circuit diagram of temperature monitoring and controlling system Arduino IDE and C language allow the programming of the low level registers in the 4508

3 atmega328p. Instructions like DDRB=0b for changing PORTB input/output pins are allowed. Arduino consists of a physical programmable circuit board and a piece of software, or IDE (Integrated Development Environment) that runs on the computer, which is used to write and upload computer code to the physical board. Arduino can cooperate with catches, LEDs, engines, speakers, GPS units, cameras, the web, and even advanced mobile phone or shrewd TV. It is the essential piece of installed frameworks. The project needs a controller to take care of the entire process. Hence a simplest platform for doing so is given by arduino. There are different types of arduino, out of which arduino uno is a basic one for electronic projects. Hence it is used here. The LCD screen is more vitality productive and can be discarded more securely than a CRT. Its low electrical power utilization empowers it to be utilized as a part of battery-controlled electronic gear more proficiently than CRTs can be. Since LCD screens don't utilize phosphors, they don't endure picture copy in when a static picture is shown on a screen for quite a while (e.g., the table edge for a flying machine plan on an indoor sign). The little 5V DC engine good with arduino is utilized as a part of this undertaking as a substitution of fan and fumes fan. IV.PROCESS EXPLANATION The detector unit consists of DHT11. The DHT11 generates a small voltage corresponds to the temperature across IC. This generated voltage is in the digital form. This voltage is fed to controller unit. The DHT11 is detect the temperature in atmosphere. Keeping that value of DHT11 the control unit will control the Air conditioner. The DHT11 sense the temperature and humidity. The DHT11 is connected in Arduino port (D2).It send the digital signal to Arduino.When the temperature and humidity change in atmosphere the DHT11 sense. Arduino receives the signals and if there is any change in set point immediate action is done by the controller part. Figure 3 Output for climate control system In controller section the DC Motor is used as control unit. This DC Motor is placed inside of Air Conditioner. It is used for increasing the coolness of Air Conditioner. And it is force the air in Air Conditioner. The controller unit consists of Arduino. This is given to the ATmega328 microcontroller, it duplicates the advanced information with coefficient and changes over this voltage specifically esteem. This value is nothing but the temperature in degree centigrade. Similarly, we multiplies the data with 1.8 and the add 32 to convert voltage level into Fahrenheit unit. This information conveying on the advanced port (2, 3, 4, 5). Thus, Arduino Uno conveys information for showing on 16x2 LCD. A 16X2 LCD is associated with microcontroller. Output for climate control system is shown in figure 3. Ventilation system comprises of DC Motor present inside the Air Conditioner. That Motor is used for making the air as cooled. Our aim is, when temperature increases the motor wants to turn ON and it make coolness.so the motor is controlled with the help of Arduino. The Arduino is interface with DHT11 sensor that gives the output in the form of pulse width modulation. This pulse width modulation controls the DC Motor speed. V. RESULTS AND DISCUSSION 4509

4 PWM Resistance vs PWM Resistance Figure 4 Resistance vs PWM As the above graph shows the relationship between PWM and resistance. The graph shows that when the resistance increases simultaneously the pulse width modulation also changes according to the temperature shown in figure 4. VI.CONCLUS ION The temperature monitoring and controlling system has designed and implemented with an Arduino board. When the device reaches the set value at different levels by setting the temperature, it results the LED turns on and off. It is very useful for the people who are disable. There is still much room for the future development that would enhance the system and increase its business value. The Air Conditioner controlled as per temperature. When temperature increases the Air Conditioner increases its coolness. When humidity increases the Air Conditioner decreases the coolness. In other projects they did only control the Fan. But we control the Air Conditioner with the DC motors and Arduino. REFERENCES [1] E Harshavardhan gaud, A Harshika, G Akhil, D Charishma, K Bhupathi, I Kumara Swamy (2017) Real Time Based Temperature Control Using Arduino International Journal of Innovations in Engineering and Technology (IJIET). [2] Karthik Krishnamurthi, Suraj Thapa, Lokesh Kothari, Arun Prakash (2015) Arduino Based Weather Monitoring System International Journal of Engineering Research and General Science. [3] Atilla Bayram, Sulaiman Abdullah Moammed and Fırat Kara (2016) Design of Heating System Controlled by Arduino 4th International Symposium on Innovative Technologies in Engineering and Science. [4] Vijay S. Kale, Rohit D. Kulkarni (2016) Real Time Remote Temperature & Humidity Monitoring Using Arduino and Xbee S2 International Journal of Innovative Research in Electrical, Electronics, Instrumentation and Control Engineering. [5] Sarmad Nozad Mahmood, Forat Falih Hasan (2017) Design of Weather Monitoring System Using Arduino Based Database Implementation Journal of Multidisciplinary Engineering Science and Technology (JMEST). [6] Shweta Manghnani, Chittampally Rajitha, Kasaram Priyanka (2017) Arduino Based Wireless System for Temperature and Humidity Monitoring International Conference on Emerging Trends in Engineering, Science and Management. [7] Hemlata Tomer, Kapil Mangla (2015) Study and Development of Temperature & Humidity monitoring system through Wireless Sensor Network (WSN) using Zigbee module Hemlata Tomer Int. Journal of Engineering Research and Application. [8] S. V. Devika, Sk. Khamuruddeen, Sk. Khamurunnisa, J. Thota and K. Shaik (2014) Arduino Based Automatic Plant Watering System IJARCSSE. [9] James S. McDonald(1997) Temperature Control Using a Microcontroller: An Interdisciplinary Undergraduate Engineering Design Project Frontiers in Education Conference. [10] HituBansal, Dr. Lini Mathew, Ashish Gupta(2015) Controlling of Temperature and Humidity for an Infant Incubator Using Microcontroller International Journal of Advanced Research in Electrical and Electronics and Instrumentation Engineering. 4510

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