Interfacing HC-SR04 Ultrasonic Sensor with PIC 16F676 using Hi-Tech C

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This topic contains 4 replies, has 2 voices, and was last updated by  sahu 2 years, 9 months ago.

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  • #10434

    sahu
    Participant

    With reference to the article Interfacing HC-SR04 Ultrasonic Distance Sensor with PIC Microcontroller, I am trying to change the microcontroller to PIC 16F676.

    #define _XTAL_FREQ 8000000
    
    #define RS RC5
    #define EN RC4
    #define D4 RC0
    #define D5 RC1
    #define D6 RC2
    #define D7 RC3
    
    //#include <xc.h>
    #include <htc.h>
    
    #include "lcd.h";
    #include <pic16f676.h>
    
    // BEGIN CONFIG
    #pragma config FOSC = HS // Oscillator Selection bits (HS oscillator)
    #pragma config WDTE = OFF // Watchdog Timer Enable bit (WDT enabled)
    #pragma config PWRTE = OFF // Power-up Timer Enable bit (PWRT disabled)
    #pragma config BOREN = ON // Brown-out Reset Enable bit (BOR enabled)
    //#pragma config LVP = OFF // Low-Voltage (Single-Supply) In-Circuit Serial Programming Enable bit (RB3 is digital I/O, HV on MCLR must be used for programming)
    #pragma config CPD = OFF // Data EEPROM Memory Code Protection bit (Data EEPROM code protection off)
    //#pragma config WRT = OFF // Flash Program Memory Write Enable bits (Write protection off; all program memory may be written to by EECON control)
    #pragma config CP = OFF // Flash Program Memory Code Protection bit (Code protection off)
    //END CONFIG
    
    void delayMs(int x);
    
    void main()
    {
      int a;
    
      TRISA = 0b00010001; //RA0 as Input PIN (ECHO)
      TRISC = 0x00; // LCD Pins as Output
    
      Lcd_Init();
    
      Lcd_Set_Cursor(1,1);
      Lcd_Write_String("Developed By");
      Lcd_Set_Cursor(2,1);
      Lcd_Write_String("electroSome");
    
      delayMs(3000);
      Lcd_Clear();
    
      T1CON = 0x10; //Initialize Timer Module
    
      while(1)
      {
        TMR1H = 0; //Sets the Initial Value of Timer
        TMR1L = 0; //Sets the Initial Value of Timer
    
        RA0 = 1; //TRIGGER HIGH
        __delay_us(10); //10uS Delay
        RA0 = 0; //TRIGGER LOW
    
        while(!RA1); //Waiting for Echo
        TMR1ON = 1; //Timer Starts
        while(RA1); //Waiting for Echo goes LOW
        TMR1ON = 0; //Timer Stops
    
        a = (TMR1L | (TMR1H<<8)); //Reads Timer Value
        a = a/58.82; //Converts Time to Distance
        a = a + 1;   //Distance Calibration
        if(a>=2 && a<=400) //Check whether the result is valid or not
        {
          Lcd_Clear();
          Lcd_Set_Cursor(1,1);
          Lcd_Write_String("Distance = ");
    
          Lcd_Set_Cursor(1,14);
          Lcd_Write_Char(a%10 + 48);
    
          a = a/10;
          Lcd_Set_Cursor(1,13);
          Lcd_Write_Char(a%10 + 48);
    
          a = a/10;
          Lcd_Set_Cursor(1,12);
          Lcd_Write_Char(a%10 + 48);
    
          Lcd_Set_Cursor(1,15);
          Lcd_Write_String("cm");
        }
        else
        {
          Lcd_Clear();
          Lcd_Set_Cursor(2,1);
          Lcd_Write_String("Out of Range");
        }
        delayMs(400);
      }
    }
    /************************************************************/
    
    void delayMs(int x)
    {
      int i;
      for (x ;x>0;x--)
      {
        for (i=0;i<=110;i++);
      }
    }

    I am using Hi-Tech C compiler and getting following errors.

    Error [1347] ; 0. can’t find 0x21 words (0x21 withtotal) for psect “text142” in segment “CODE” (largest unused contiguous range 0x1E)
    Error [1347] ; 0. can’t find 0x12 words (0x12 withtotal) for psect “text140” in segment “CODE” (largest unused contiguous range 0x7)
    Error [1347] ; 0. can’t find 0xF words (0xf withtotal) for psect “text144” in segment “CODE” (largest unused contiguous range 0x7)

    #10437

    Ligo George
    Keymaster

    You should use a PIC with higher memory or reduce the code size.

    #10438

    sahu
    Participant

    what’s the way reduce the code size ?

    #10439

    Ligo George
    Keymaster
    • Reduce code length
    • Remove unnecessary statemetns
    • Optimize the Lcd_Port() by using single statement, eg  : PORTC = a by making necessary changes in the circuit diagram.
    #10442

    sahu
    Participant

    you- Remove unnecessary statements

    me- i think here every statements is necessary

    you- Optimize the Lcd_Port() by using single statement, eg  : PORTC = a by making necessary changes in the circuit diagram.

    me – if i use single statement, eg  : PORTC ,then no need Lcd_Port()

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