Chapter 4 : ADC Programming

Example of Circuit

 

 

Exercise 1 :

 

//ExerciseADC1:Display Voltage Percentage and Temperature

#include <18f4550.h> //Header File
#fuses HS, NOWDT, NOLVP, NOPROTECT //Hardware Configuration
#device ADC=10 //Select 10 bit resolution
#use delay(clock=20M)
#include <lcd.c> //Driver for LCD

//Pin Definitions for LCD
#define   LCD_ENABLE_PIN   PIN_D0
#define   LCD_RS_PIN       PIN_D1
#define   LCD_RW_PIN       PIN_D2
#define   LCD_DATA4        PIN_D4
#define   LCD_DATA5        PIN_D5
#define   LCD_DATA6        PIN_D6
#define   LCD_DATA7        PIN_D7

//Main Function
void main(){
   //Variable declaration
   int32 value1, voltage, value2, temp, percent;

   //initialize LCD
   lcd_init();

   //ADC configuration
   setup_ADC(ADC_CLOCK_INTERNAL);
   setup_ADC_ports(ALL_ANALOG);

   while(true){
      //Program Start Here

      //Voltage
      set_adc_channel(0);
      value1=read_adc(); //Read analog signal
      voltage=value1*5/(1024-1); //Calculate conversion

      //Percentage
      percent=value1*100/(1024-1); //Calculate conversion
      //Temperature Sensor LM35
      set_adc_channel(1);
      value2=read_adc(); //Read analog signal
      temp=value2*5*100/1023; //Conversion
        
      //Display on LCD
      printf(lcd_putc,"\fVoltage = %dV",(int)voltage);
      printf(lcd_putc,"\nPercentage=%d%%",(int)percent);
      delay_ms(500);
      printf(lcd_putc,"\fSuhu=%.2f Degree",(float)temp);
      delay_ms(500);

   }
}

 

//**********************************************************

 

Exercise 2:

 

//ExerciseADC2: 3 LEDs will turn ON base on temperature

#include <18f4550.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#device ADC=10
#use delay(clock=20M)
#include <lcd.c>

//Pin Definition
//Pin Definitions for LCD
#define   LCD_ENABLE_PIN   PIN_D0
#define   LCD_RS_PIN       PIN_D1
#define   LCD_RW_PIN       PIN_D2
#define   LCD_DATA4        PIN_D4
#define   LCD_DATA5        PIN_D5
#define   LCD_DATA6        PIN_D6
#define   LCD_DATA7        PIN_D7

 

//Pin Definition for LED
#define   RED      PIN_C0
#define   YELLOW   PIN_C1
#define   GREEN    PIN_C2

//Main Function
void main(){
   int32 value1, temperature;
  
   lcd_init();

   //Set PORT C as output
   set_tris_c(0x00);
   output_c(0x00); //Initialize PORT C
  
   //ADC configuration
      setup_ADC(ADC_CLOCK_INTERNAL);
      setup_ADC_ports(ALL_ANALOG);
   while(true){
      //Read Analog Signal
      set_adc_channel(1);
      value1=read_adc();
      temperature=value1*100*5/1023;
     
      if(temperature>=100){
  printf(lcd_putc,"\fSuhu Alert \n%.2f Celcius",(float)temperature);
         output_high(RED);
         output_low(YELLOW);
         output_low(GREEN);
         delay_ms(500);
      }
      else if(temperature<=95&&temperature>=25){
 printf(lcd_putc,"\fSuhu Normal \n%.2f Celcius",(float)temperature);
         output_low(RED);
         output_high(YELLOW);
         output_low(GREEN);
         delay_ms(500);  
      }
      else if(temperature<=20){
     printf(lcd_putc,"\fSuhu Low\n%.2f Celcius",(float)temperature);
         output_low(RED);
         output_low(YELLOW);
         output_high(GREEN);
         delay_ms(500);  
      }
   }
}

//**********************************************************

Exercise 3:

//ExerciseADC3 : Manipulating LCD for displaying ADC
#include <18f4550.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#device ADC=10
#use delay(clock=20M)
#include <lcd.c>
//Pin Definition
//Pin Definitions for LCD
#define   LCD_ENABLE_PIN   PIN_D0
#define   LCD_RS_PIN       PIN_D1
#define   LCD_RW_PIN       PIN_D2
#define   LCD_DATA4        PIN_D4
#define   LCD_DATA5        PIN_D5
#define   LCD_DATA6        PIN_D6
#define   LCD_DATA7        PIN_D7
//Main Function
void main(){
   //Variable declaration
   int32 value1, voltage, value2, temp, percent;
   //initialize LCD
   lcd_init();
   //ADC configuration
   setup_ADC(ADC_CLOCK_INTERNAL);
   setup_ADC_ports(ALL_ANALOG);
   while(true){
      //Program Start Here
      //Voltage
      set_adc_channel(0);
      value1=read_adc(); //Read analog signal
      voltage=value1*5/(1024-1); //Calculate conversion
      //Percentage
      percent=value1*100/(1024-1); //Calculate conversion
      //Temperature Sensor LM35
      set_adc_channel(1);
      value2=read_adc(); //Read analog signal
      temp=value2*5*100/1023; //Conversion
        
      //Display on LCD
      printf(lcd_putc,"\fVoltage = %dV",(int)voltage);
      delay_ms(500);
      printf(lcd_putc,"\fSuhu=%.2f Degree",(float)temp);
      delay_ms(500);
   }
}

//**********************************************************
 
Exercise 4:

 


//ExerciseADC4: Controlling Motor via ADC

#include <18f4550.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#device ADC=10
#use delay(clock=20M)
#include <lcd.c>

//Pin Definitions for LCD
#define   LCD_ENABLE_PIN   PIN_D0
#define   LCD_RS_PIN       PIN_D1
#define   LCD_RW_PIN       PIN_D2
#define   LCD_DATA4        PIN_D4
#define   LCD_DATA5        PIN_D5
#define   LCD_DATA6        PIN_D6
#define   LCD_DATA7        PIN_D7
//Pin Definition for LED
#define   Motor1_L      PIN_C4
#define   Motor1_R      PIN_C5
#define   Motor2_L      PIN_C6
#define   Motor2_R      PIN_C7

//Main Function
void main(){
   int32 value1, voltage;
  
   lcd_init();
   //Set PORT C as output
   set_tris_c(0x00);
   output_c(0x00); //Initialize PORT C
  
   //ADC configuration
      setup_ADC(ADC_CLOCK_INTERNAL);
      setup_ADC_ports(ALL_ANALOG);
   while(true){
      //Read Analog Signal
      set_adc_channel(0);
      value1=read_adc();
      voltage=value1*5/1023;
     
      if(voltage>=3){
         printf(lcd_putc,"\fVoltage \n%dV",(int)voltage);
         output_high(Motor1_L);
         output_low(Motor1_R);
         output_low(Motor2_L);
         output_low(Motor2_R);
         delay_ms(500);
      }
      else if(voltage<=2){
         printf(lcd_putc,"\fVoltage \n%dV",(int)voltage);
         output_low(Motor1_L);
         output_low(Motor1_R);
         output_high(Motor2_L);
         output_low(Motor2_R);
         delay_ms(500);  
      }
      else{
         printf(lcd_putc,"\fVoltage \n%dV",(int)voltage);
         output_low(Motor1_L);
         output_low(Motor1_R);
         output_low(Motor2_L);
         output_low(Motor2_R);
         delay_ms(500);  
      }
   }
}

//**********************************************************
 
Exercise 5:

//ExerciseADC5: Controlling LED bargraph
#include <18f4550.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#device ADC=10
#use delay(clock=20M)
#include <lcd.c>
//Pin Definition
//Pin Definitions for LCD
#define   LCD_ENABLE_PIN   PIN_D0
#define   LCD_RS_PIN       PIN_D1
#define   LCD_RW_PIN       PIN_D2
#define   LCD_DATA4        PIN_D4
#define   LCD_DATA5        PIN_D5
#define   LCD_DATA6        PIN_D6
#define   LCD_DATA7        PIN_D7

//Main Function
void main(){
   int32 value1, voltage;
  
   lcd_init();

   //Set PORT B as output
   set_tris_b(0x00);
   output_b(0x00); //Initialize PORT C
  
   //ADC configuration
      setup_ADC(ADC_CLOCK_INTERNAL);
      setup_ADC_ports(ALL_ANALOG);
   while(true){
      //Read Analog Signal
      set_adc_channel(0);
      value1=read_adc();
      voltage=value1*5/1023;
   
   if(voltage==0){
         printf(lcd_putc,"\fVoltage \n%dV",(int)voltage);
         output_b(0);
         delay_ms(500);
      }
      else if(voltage==1){
         printf(lcd_putc,"\fVoltage \n%dV",(int)voltage);
         output_b(3);
         delay_ms(500);  
      }
      else if(voltage==2){
         printf(lcd_putc,"\fVoltage \n%dV",(int)voltage);
         output_b(15);
         delay_ms(500);  
      }
   else if(voltage==3){
         printf(lcd_putc,"\fVoltage \n%dV",(int)voltage);
         output_b(31);
         delay_ms(500);  
      }
   else if(voltage==4){
         printf(lcd_putc,"\fVoltage \n%dV",(int)voltage);
         output_b(63);
         delay_ms(500);  
      }
   else if(voltage==5){
         printf(lcd_putc,"\fVoltage \n%dV",(int)voltage);
         output_b(255);
         delay_ms(500);  
      }
   }
}