Air Conditioner Controller :: essays research papers

1. INTRODUCTIONToday, thanks to the advancement in the field of electronics, virtually of the manually controlled systems ar getting replaced with sophisticated electronic circuits with intelligent controlls. These circuits are capable of monitoring, analyzing and controlling the systems. In earlier days these electronic circuits were fictive around discrete hardware components such as transistors, logic ICs etc that progress the system bulky and costly. Also since the component count was more the hardship rate was withal more. But now due to the introduction of ace chip microcontrollers, the hardware part was drastically reduced so also the cost and size of the hardware has cause down to a self-aggrandising extent. As a result almost all of the control circuits are designed over single chip microcontrollers.2.SCOPE OF THE PROJECTThe primary election objective of this project is to make a simple circuitry for send conditioner controller. This circuitry is base on the s tate of the art technology of Microcontrollers .The features of the project is has given under1.Facility to set the temperature using a potentiometer.2.A scupper indicates the temperature both the set value and the real value.3.An indication when the set range is beyond limits.4.The system turns ON the Air conditioner when the set temperature.5.A mode chooser switch is provided to select between congeal MODE and RUN MODE.6.When the SET mode is selected the display indicates the set value. When RUN mode is selected the display indicates the actual room temperature.The whole circuitry works on 230V AC. From this a series regulator is designed to derive +5V regulated supply for the microcontroller part. The circuitry is based on the common microcontroller Atmel 89S8252 The project consists of necessary software and hardware for implementing the above function.3.BLOCK nonrepresentational OF THE PROJECTThe figure below shows the block schematic of the project. This consists of t he following.1.Power provide Unit2.Microcontroller Unit3.A Potentiometer For Temperature Set.4.A Temperature Sensor circumference5.A Display tour of duty6.A Relay Driver CircuitIt also consists of the following indications1. Temperature Display on seven segment Display (2 digit)2. A set range out indication.The circuit turns on a relay when the set temperature is less than the room temperature. This relay turns ON the Air Conditioner.4.STUDY OF MICROCONTROLLERThis project makes use of a microcontroller-based circuitry for decision making such as password checking and device control. The microcontroller used here is microchip make PIC series IC 16F870.a. MicroprocessorsA microprocessor, as the term has come to be known, is a general- purpose digital computer central process unit (CPU).