Applications of Embe ...

 #include <main.h> // the file main.h with the

                  // initial settings is included.

                  // This file must be placed in the same

                  // folder with the project.

                  // Also the 18F4550.h file must exist

                  // in the same folder with the project

#include <flex_lcd.h> // The h file of the lcd driver

                      // should be in the same folder where we will save our program.

                      // The #define LCD_DB4 PIN_B4 etc statements in flex_lcd.c

                      // should be checked and possibly modified.

                      // These statements determine the pins of the microcontroller

                      // that are connected to LCD 16x2.

#byte PORTB =0xF81

                     // We attribute to the memory position 0xF81 the name PORTB.

                     // This means that we define a 8 bit variable whose value

                     // will be stored to the memory position F81h.

                     // The memory position F81h is the PORTD data register.

#byte PORTD =0xF83

                     // We attribute to the memory position 0xF83 the name PORTD.

                     // This means that we define a 8 bit variable whose value

                     // will be stored to the memory position F83h.

                     // The memory position F83h is the PORTD data register.

unsigned int16 ADC_value; //ADC = 10 Bit => values: 0~1023

float voltage; //variable to store the sensor's (TMP36) analog voltage

float temperature; //variable to store sensor's temperature

// ********* main program ************************

void main() {

   set_tris_b(0x00);    //PORTB is defined as output

   set_tris_d(0x00);    //PORTD is defined as output

   lcd_init();          //initialization routine for the LCD 16x2               

   setup_adc(ADC_CLOCK_DIV_8);      // Set ADC conversion time to 8Tosc

   setup_adc_ports(AN0);            // Set RA0 as analog pin

   set_adc_channel(0);               // Select channel 0 (Analog input 0)

   while(TRUE) {

      delay_ms(1000);          //wait for 1 sec

      lcd_putc("\f");          //clear the screen

      lcd_putc(" Temperature"); //send a message to the LCD

      lcd_gotoxy(1,2);          //first position of the second line

      ADC_value=read_adc();    //read value from ADC

      voltage = ((float)(ADC_value*5)/1024); //convert adc value to analog voltage

      voltage*=1000; //convert V to mV

      temperature = (voltage-500)/10;//convert sensor's voltage (mV) to temperature (oC)

      printf(lcd_putc,"%f oC",temperature); //send a message to the LCD

      //turn ON / OFF LEDs according to temperature

      if(temperature<0){

         PORTD=0b00000000;

      }

      else if(temperature<10){

         PORTD=0b00000001;

      }

      else if(temperature<20){

         PORTD=0b00000011;

      }

      else if(temperature<30){

         PORTD=0b00000111;

      }

      else if(temperature<40){

         PORTD=0b00001111;

      }

      else if(temperature<50){

         PORTD=0b00011111;

      }

      else if(temperature<60){

         PORTD=0b00111111;

      }

      else if(temperature<70){

         PORTD=0b01111111;

      }

      else{

         PORTD=0b11111111;

      } 

   }