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Air Conditioner Controller

1. INTRODUCTION

Today, thanks to the advancement in the field of electronics, most of the manually controlled systems are 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 fabricated around discrete hardware components such as transistors, logic ICs etc that made the system bulky and costly. Also since the component count was more the failure rate was also more. But now due to the introduction of single chip microcontrollers, the hardware part was drastically reduced; so also the cost and size of the hardware has come down to a large extent. As a result almost all of the control circuits are designed over single chip microcontrollers.



2. SCOPE OF THE PROJECT

The primary objective of this project is to make a simple circuitry for Air conditioner controller. This circuitry is based on the state of the art technology of Microcontrollers .The features of the project is has given below

1. Facility to set the temperature using a potentiometer.
2. A Display indicates the temperature – both the set value and the actual 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 selector switch is provided to select between SET 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 popular microcontroller Atmel 89S8252 The project consists of necessary software and hardware for implementing the above function.

3. BLOCK SCHEMATIC OF THE PROJECT

The figure below shows the block schematic of the project. This consists of the...