Lets begin with the project now. The main purpose of this project is to make a system whole purpose is to maintain the temperature within the predefined limits. Thus,this system proves to be useful to be used as a Air Conditioning System inside room,offices,departmental stores etc.Apart from that,it can also be used in various industrial applications such as to control the temperature in boilers,refrigerator,AC computers and Laboratories etc.
Now lets look at each element of the design turn by turn.
Flow Chart:
Flow Chart:
Block Diagram :
Above figure shows the block diagram of the system that we have designed.Basically, it consists of microcontroller as a central processor of the entire control operation. The temperature sensor gives the analog output voltage based on the temperature of the room.This analog voltage is fed to the A/D converter.The A/D converter then converts the analog input voltage from the temperature sensor into equivalent binary bits.The converted binary data from the A/D converter is applied to microcontroller.The microcontroller reads binary data from A/D converter,convert it to suitable form and performs different operations based on the value of temperature read from A/D converter.
The LCD is used to display the data given by microcontroller.Microcontroller can turn on dc fan through the optocoupler if required.We have used led as prototype model for heater.If appropriate condition is met microcontroller can turn on heater(i.e. LED).
In this system,if the temperature read is in between 20-25 degree celcius,it is considered normal state.In this condition both fan and heater are off but the temperature and status is displayed in LCD.If the temperature of the room is greater that 25 degree celcius it is considered to be a situation to turn on fan and turn off heater. If the temperature of the room is in between 25-30 degree celcius it is considered as a situation to turn on fan with speed of level one.In this level,appropriate temperature and status is displayed on the LCD. If the temperature of the room is in between 30-35 degree celcius it is considered as a situation to turn on fan with speed of level two.In this level,appropriate temperature and status is displayed on the LCD. If the temperature of the room is greater than 35 degree celcius it is considered as a situation to turn on fan with speed of level three.In this level,appropriate temperature and status is displayed on the LCD. If the temperature of the room is less that 20 degree celcius it is considered to be a situation to turn on Heater and turn off fan. If the temperature of the room is in between 10-20 it is considered as a situation to turn one heater on with heat of level one.In this level,appropriate temperature and status is displayed on the LCD. If the temperature of the room is in between 0-10 it is considered as a situation to turn two heater on with heat of level two.In this level,appropriate temperature and status is displayed on the LCD.
Circuit Diagram:
Now, if you are interested for this project and need all of Proteus & Keil data, please kindly do write me mail at my mail : ojha.bpn1@gmail.com
Also I can help you with the proposal, mid term reports and final reports.
After all, SHARING IS CARING :)
Good job. I understand how it works. This is not so and difficult as I thought. Maybe Now I can take apart and fix my old air conditioner. New air-conditioning, I would not touch it, it is better to leave it professionals http://myairmatics.com. I do not advise to go into the new air conditioners, as there are many systems which you can accidentally break :)
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