Fan automation

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8051 FAN AUTOMATION WITH PROGRAMMING IN C

8051 FAN AUTOMATION WITH PROGRAMMING IN C

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  • 1. HOME AUTOMATION TEMPRATURE CONTROL SUBMITTED BY:AJITESH PAL SINGH
  • 2. INTRODUCTION The goal of our project is to design a user-friendly home automation system which can be easily integrated into existing homes and businesses.  It is automation of the home, housework or household activity.  Home automation may include centralized control of lighting, HVAC (heating, ventilation and air conditioning), appliances, security locks of gates and doors and other systems, to provide improved convenience, comfort, energy efficiency and security. 
  • 3. How it works?  Basically it is used to control temperature.  At 30°C temp it will work normally but when the temperature above 30°C the fan will start moving.   Temperature will show in the LCD display. Connector is connected with the motor driver and it will help to rotate the fan.
  • 4. Advantages  Increasing safety System.  Lighting Control (Centralized).  Heat and Cool Control system.  Video systems.
  • 5. Applications    Low-cost Program Control of Industrial Furnaces. Ideal for Increasing the Control Performance of Industrial Hot Air Blowers High Resolution Temperature Measurement.
  • 6. Power supply  This is used to control the voltage and current coming from the main supply.  We use step down center tap transformer with fullwave rectifier and 7805 voltage regulator.
  • 7. Fullwave Rectifier  A bridge is simply two fullwave circuits... So. fullwave has the advantage of having half the diode drop.  The PIV is one half that of the center tap circuit.
  • 8. MICROCONTROLLER (AT89S52)  It has inbuilt ram, rom, timer or we can say that it is a small cpu which is used for performing specific task.  AT89S52 microcontroller is made up with c mos technology with operation form 2.7 to 5.5v.  It has 256 B ram and 8k rom,32 i/o lines,16 bit counter/timer,6 interrupts.  It has one full duplex UART.
  • 9. LCD(Liquid Crystal Display)  It is used to display a data  It is a 16*2 lcd .  It has 16 pins from which it has 8 data lines.  Its one block is 5*7 dot matrix pattern.
  • 10. Temperature Sensor LM35  It is precision temperature sensor in celcius.  Its sensitivity is linear + 10 mV/°C.  It can measure from -55°C and 150°C.  Can be used to detect ambient air temperature  LM35 Linear Temperature Sensor is based on the semiconductor LM35 temperature sensor.  The output voltage is proportional to the temperature.
  • 11. ADC0808 (ANOALG TO DIGITAL CONVERTOR )  It is commonly called ADC.  ADC0808 is an 8 bit analog to digital converter with eight input analog channels.  The default step size is 19.53mV corresponding to 5V reference voltage.  The ADC needs some specific control signals for its operations like start conversion and bring data to output pins.  The voltage reference can be set using the Vref+ and Vrefpins.
  • 12. Motor Driver(L293D)  L293D is a dual H-bridge motor driver integrated circuit (IC).  Motor drivers act as current amplifiers since they take a low-current control signal and provide a higher-current signal. This higher current signal is used to drive the motors.  L293D contains two inbuilt Hbridge driver circuits. In its common mode of operation, two DC motors can be driven simultaneously, both in forward and reverse direction.
  • 13. Program  #include<reg51.h>  #include"lcd.h"  #define MYDATA P3  sbit ADDR_A=P1^7;  sbit ADDR_B=P1^6;  sbit ADDR_C=P1^5;  sbit ALE =P1^4;  sbit clock =P1^3;  sbit OE =P1^2;  sbit EOC =P1^1;  sbit SC =P1^0;  sbit m1a =P2^0;  sbit m1b =P2^1;  unsigned char adc_start(unsigned char );  unsigned char *display_numbers(unsigned char);  unsigned int speed_on=0,speed_value_on_time=0,s peed_value_off_time=1020,t;
  • 14. void timer0(void) i { clock=~clock;} • unsigned char adc_start(unsigned char kkk ) • { unsigned char value; • TR0=1; • MYDATA=0XFF; • EOC=1; • ALE=0; • OE=0; • SC=0; • ADDR_C=(kkk>>2)&0x01; • ADDR_B=(kkk>>1)&0x01; • ADDR_A=(kkk>>0)&0x01; • delay(50);//for 4ms • ALE=1; • delay(50);//for 4ms • SC=1; • delay(50);//for 4ms • ALE=0; • SC=0;
  • 15. • • • • • • • • • • • • • • • • • • • • } delay(50);//for 4ms while(EOC==1); while(EOC==0); OE=1; delay(10);//for 4ms value=MYDATA; OE=0; TR0=0; return(value); } unsigned char *display_numbers(unsigned char abbc) { unsigned char kkk[3],ttt=0; while(ttt<3) { kkk[ttt]=abbc%10; ttt++; abbc=abbc/10; } return(kkk);
  • 16. void main() { unsigned char *bb,temp_resister; initialize(); m1a=0; m1b=0; cmd(0x80); ptr("Temperature= "); TMOD=0X02; //mode 2 TH0=0xfb; IE=0X82; TR0=0; //timer stop cmd(0xc0); bb[0]=0; bb[1]=0; bb[2]=0;
  • 17. • • • • • • • • • • • • • • • • • • • • while(1) { temp_resister=adc_start(0x00); if(temp_resister>30) { m1a=0; m1b=1; cmd(0xc0); ptr(" FAN ON ");} else { m1a=0; m1b=0; cmd(0xc0); ptr(" FAN OFF ");} bb=display_numbers(temp_resister); delay(50); cmd(0x8C); } }