Điều khiển quạt-lò sưởi-giao diện Glcd-Pic16f887

Yêu cầu: ta có 2 thiết bị là quạt gió (motor) và lò sưởi (bóng đèn). Khi nhiệt độ của phòng trên mức nhiệt độ đặt trước  ( tem Ref) thì quạt gió hoạt động, lò sưởi tắt. Ngược lại thì quạt tắt và lò sưởi được mở. Giao diện người dùng được hiển thị trên GLCD. Mức nhiệt độ Ref được điều chỉnh qua 2 button được kết nối qua RB0, RB1, LM35 kết nối RA0, quạt kết nối RB6, lò sưởi RB7, GLCD kết nối với PORTD.

Sơ đồ nguyên lý vẽ trên protues:

Điều khiển quạt và lò sưởi

Code:

/*

This project uses LM35 sensor that senses the temperature and then turns

on Fan if temperature is high and turns on Heater if temperature is low.

The Graphic LCD displays temperature value in text and graphically.

User can select reference number using buttons. This reference

number is compared with the temperature to control Fan or Heater.

The reference number is stored in EEPROM.

Temperature sensor is connected to AN0. And Vref 1.5V connected to AN3

Author: Sameer Semmoor

Shared by http://dientudieukhien.net

*/

// Glcd module connections

char GLCD_DataPort at PORTD;

sbit GLCD_CS1 at RC0_bit;

sbit GLCD_CS2 at RC1_bit;

sbit GLCD_RS  at RB3_bit;

sbit GLCD_RW  at RB4_bit;

sbit GLCD_EN  at RB5_bit;

sbit GLCD_RST at RE2_bit;

sbit GLCD_CS1_Direction at TRISC0_bit;

sbit GLCD_CS2_Direction at TRISC1_bit;

sbit GLCD_RS_Direction  at TRISB3_bit;

sbit GLCD_RW_Direction  at TRISB4_bit;

sbit GLCD_EN_Direction  at TRISB5_bit;

sbit GLCD_RST_Direction at TRISE2_bit;

// End Glcd module connections

unsigned int adc_value; //stores analog values converted to digital

float TempC;  //stores temperature value

float _TempC=0;  //copy temperature value

unsigned short comp_value; //contains temperature value without a decimal point

char TempC_text[15];

unsigned short cnt; //stores the counter value

char cnt_txt[4];

bit temp_changed_flag; //will be set if temperature value changed

bit increment_switch; //will be set if increment switch was prseed

bit decrement_switch; //will be set if decrement switch was prseed

//configuration function--------------------------------------------------------

void _init()

{

  ADC_Init();  // Initialize ADC module with default settings

  ADCON1 = 0b00000101;

  TRISA.B0 = 1; // PORT A0 as input

  //counter switches as input

  TRISB.B0 = 1; //increment

  TRISB.B1 = 1; //decrement

  TRISB.B6 = 0; PORTB.B6 = 0;//FAN as output

  TRISB.B7 = 0; PORTB.B7 = 0;//HEATER as output

  Glcd_Init();  // Initialize GLCD

  Glcd_Fill(0x00);  // Clear GLCD

  Glcd_Write_Text("Temperature Meter", 0, 0, 1);

}

//end configuration function----------------------------------------------------

//draw circle and rectangle-----------------------------------------------------

void draw()

{

  Glcd_Circle(116, 52, 11, 1);

  Glcd_Rectangle(112, 42, 120, 2, 1);

}

//end draw circle and rectangle-------------------------------------------------

//get temperature---------------------------------------------------------------

void get_adc()

{

   adc_value = ADC_Read(0); //read analog from AN0

   //calculate temperature

   TempC = adc_value * 1.5;

   TempC = TempC / 1024;

   TempC = TempC * 100;

   if(TempC != _TempC) //display temperature value if temperature changed

   {

     temp_changed_flag = 1; //set this flag because temperature value changed

     _TempC = TempC; //copyt the new temperature value

     comp_value = TempC;  //copy tmeperature value without decimal point

     floattostr(TempC,TempC_text);  //convert temperature to string

     Glcd_Write_Text("Temp: ", 0, 2, 1);

     Glcd_Write_Text(TempC_text, 30, 2, 1);  //display temeperature

     if(TempC < 1){ Glcd_Write_Text("     ", 82, 2, 1);} //if temperature value is below 1 clear -1 position

     Glcd_Write_Text("C", 78, 2, 1); //display temperature measurement unit

   }

}

//end get temperature-----------------------------------------------------------

//draw the progressbar----------------------------------------------------------

void progress_bar()

{

  //update progress bar circle

  if(tempC > 0  && tempC < 11){Glcd_Box(113, 3, 119, 41, 0);Glcd_Circle_Fill(116, 52, 10, 0);Glcd_Circle_Fill(116, 52, 2, 1);}

  if(tempC > 10  && tempC < 21){Glcd_Box(113, 3, 119, 41, 0);Glcd_Circle_Fill(116, 52, 10, 0);Glcd_Circle_Fill(116, 52, 4, 1);}

  if(tempC > 20  && tempC < 31){Glcd_Box(113, 3, 119, 41, 0);Glcd_Circle_Fill(116, 52, 10, 0);Glcd_Circle_Fill(116, 52, 6, 1);}

  if(tempC > 30  && tempC < 41){Glcd_Box(113, 3, 119, 41, 0);Glcd_Circle_Fill(116, 52, 10, 0);Glcd_Circle_Fill(116, 52, 8, 1);}

  if(tempC > 40  && tempC < 51){Glcd_Box(113, 3, 119, 41, 0);Glcd_Circle_Fill(116, 52, 10, 0);Glcd_Circle_Fill(116, 52, 10, 1);}

  //update progress bar rectangle

  if(tempC > 50  && tempC < 61){Glcd_Box(113, 3, 119, 41, 0);Glcd_Box(113, 39, 119, 41, 1);}

  if(tempC > 60  && tempC < 71){Glcd_Box(113, 3, 119, 41, 0);Glcd_Box(113, 35, 119, 41, 1);}

  if(tempC > 70  && tempC < 81){Glcd_Box(113, 3, 119, 41, 0);Glcd_Box(113, 30, 119, 41, 1);}

  if(tempC > 80  && tempC < 91){Glcd_Box(113, 3, 119, 41, 0);Glcd_Box(113, 25, 119, 41, 1);}

  if(tempC > 90  && tempC < 101){Glcd_Box(113, 3, 119, 41, 0);Glcd_Box(113, 20, 119, 41, 1);}

  if(tempC > 100  && tempC < 111){Glcd_Box(113, 3, 119, 41, 0);Glcd_Box(113, 15, 119, 41, 1);}

  if(tempC > 110  && tempC < 121){Glcd_Box(113, 3, 119, 41, 0);Glcd_Box(113, 10, 119, 41, 1);}

  if(tempC > 120  && tempC < 131){Glcd_Box(113, 3, 119, 41, 0);Glcd_Box(113, 5, 119, 41, 1);}

  if(tempC > 130  && tempC < 141){Glcd_Box(113, 3, 119, 41, 0);Glcd_Box(113, 4, 119, 41, 1);}

  if(tempC > 140  && tempC < 151){Glcd_Box(113, 3, 119, 41, 0);Glcd_Box(113, 3, 119, 41, 1);}

}

//end draw the progressbar------------------------------------------------------

//get counter value-------------------------------------------------------------

void counter()

{

   if(increment_switch == 1) //if increment swictch was pressed

   {

    cnt++;   //increment counter

    if(cnt > 148){cnt = 150;}  //counter should not exceed max

    eeprom_write(0,cnt); //store counter in eeprom

    delay_ms(300);

   }

   if(decrement_switch == 1) //if decrement swictch was pressed

   {

    cnt--; //decrement counter

    if(cnt < 1){cnt = 1;}  //counter should not go blow min

    eeprom_write(0,cnt); //store counter in eeprom

    delay_ms(300);

   }

   bytetostr(cnt,cnt_txt);  //convert counter value to string

   Glcd_Write_Text("counter: ", 0, 4, 1);

   Glcd_Write_Text(cnt_txt, 47, 4, 1);//display counter

}

//end get counter value---------------------------------------------------------

//control FAN & HEATER----------------------------------------------------------

void control_fan_heater()

{

   if(comp_value == cnt) //if weather is normal

   {

     portb.b6 = 0; //turn off fan

     portb.b7 = 0; //turn off heater

     Glcd_Write_Text("             ", 0, 6, 1); //clear text position

   }

   else if(comp_value < cnt) //if weather is cold

   {

     portb.b6 = 0; //turn off fan

     portb.b7 = 1; //turn on heater

     Glcd_Write_Text("             ", 0, 6, 1);  //clear text position

     Glcd_Write_Text("Heater ON ", 0, 6, 1); //display Heater status

   }

   else //if weather is hot

   {

     portb.b7 = 0; //turn off heater

     portb.b6 = 1; //turn on fan

     Glcd_Write_Text("             ", 0, 6, 1); //clear text position

     Glcd_Write_Text("Fan ON ", 0, 6, 1); //display fan status

   }

}

//end control FAN & HEATER------------------------------------------------------

//main program------------------------------------------------------------------

void main()

{

  _init(); //start with the configurations

  draw(); //draw the circle and rectangle

  cnt = eeprom_read(0); //get counter from eeprom

  counter(); //display counter at the beginning

  do

  {

    get_adc(); //read ADC value

    if(portb.b0 == 0){increment_switch = 1; counter();} //if increment switch was pressed set its flag and increment counter

    if(portb.b1 == 0){decrement_switch = 1; counter();} //if deccrement switch was pressed set its flag and decrement counter

    //enter here if temperature changed or any of the switches was pressed

    if(temp_changed_flag == 1 || increment_switch == 1 || decrement_switch == 1)

    {

      progress_bar();  //update progress bar

      control_fan_heater(); //control FAN or HEATER

      //reset the flags

      temp_changed_flag =0;

      increment_switch = 0;

      decrement_switch = 0;

    }

  }while(1);

}

//end main program--------------------------------------------------------------

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