LM35DZ Sensor and PIC18F4550

[Nagen Daksh]

Hello to everyone,

I'm seeking for a program that can be used for PIC18F4550 to display the temperature in LCD. I have already search the topics in this forum regarding this subject but couldn't find it. In Cytron website there is a project regarding this but it specifies for 16F877(Project 5 in Cytron main website)? Could anybody help me to give any suitable program that can be display temperature using the 18F4550...

[ober]

We do not have sample of reading LM35 and display it on LCD with 18F4550.

Anyway a good way to learn is get a template or sample program for PIC18F4550 (you can try downloading some sample code under SK40C page). Make sure you can compile and load into your board, also it can display message on LCD.

From there, develop the code for ADC and read LM35.

[Nagen Daksh]

Thanks for your kind reply Mr.Ober. But sir, myself are not good in handling PIC184550 because it is a new attempt for me too.I'm more perefer to use PIC16F877A because I'm familiar with that but unfortunately my situation makes me to use PIC18F. So sir, could you help to create or some example of codes. I'm really need it.

[yonghui]

I think the tutorial website of Cytron has example for sk40 LCD display project , u Can Refer The code to get start.

[Brian Griffin]

There is not much of a difference from a PIC16F to a PIC18F. And, it's not like you are writing the same code for a Motorola processor.

[Nagen Daksh]

Thanks for the kind replies guys. As yonghui said, I have tried most of the codes in cytron website itself and other codes at different source. A the result all the LED source code that I've tried using sk40 are successful. But when it comes to LCD,I'm quite blur because although i could compile it but I cannot display it. Only black box appear. I have go through all the notes given by cytron and I think my connection are right too. But maybe there is some mistakes I've done during the compiling process.Hence there is few question that I would like to ask?

If the input port is set at Port B and the output is PORT D, should i use a jumper to connect it?(*not too familiar with sk40c port usage and how actually it work)

this is an example of my code for PIC18F4550 :

CODE: SELECT_ALL_CODE

   //LCD Display Program
   //P1(LCD -data)=PB, P2(LCD reg)=PD

   #include<htc.h>

   #define RS   RD0
   #define RW   RD1
   #define EN   RD2

   void LCD_delay(void)
   {
   int t;
   for(t=0;t<250;t++);
   }

   
   void delay_ms(unsigned char delay)
   {
   unsigned int i,j;
   for(i=0;i<=delay;i++);
   {
   for(j=0;j<=1000;j++);
   }
   }

   void LCD_command(unsigned char command)
   {
   unsigned char temp;
   RS=0;

   temp=command & 0xff;
   PORTB&=0x00;
   PORTB|=temp;
   EN=1;
   for(temp=0;temp<5;temp++);
   EN=0;
   LCD_delay();
   }
   
   void LCD_data(unsigned char data)
   {
   unsigned char temp;
   RS=1;
   temp=data & 0xff;
   PORTB&=0x00;
   PORTB|=temp;
   EN = 1;
   for(temp=0;temp<5;temp++);
   EN=0;
   LCD_delay();
   }

   void initialise_LCD(void)
   {
   TRISB = 0x00;
   PORTB = 0x00;

   TRISD = 0x00;
   PORTD = 0x00;
   EN=0;
   RW=0;
   
      delay_ms(40);
      LCD_command(0x38);
      delay_ms(20);
      LCD_command(0x38);
      delay_ms(2);
      LCD_command(0x38);
      delay_ms(1);
      
      LCD_command(0x07);
      LCD_command(0x0c);
      LCD_command(0x14);
      LCD_command(0x02);
      LCD_command(0x01);
      delay_ms(1);
   }
   
   void clear_LCD()
   {
      LCD_command(0x01);
      delay_ms(1);
   }

   void display_LCD(char line_number, char position,const char*message)
   {
      int a;
      if(line_number==1)
   {
      a=0x80+position;
      LCD_command(a);
   }
      else if(line_number==2)
   {
      a=0xC0+position;
      LCD_command(a);
   }
      while(*message);
   {
      LCD_data(*message);
      delay_ms(15);
      message++;
   }
   }   
   
   void main(void)
   {
   
   __CONFIG(0x193A);
   initialise_LCD();
   while(1)
   {
   display_LCD(1,8, "Welcome to ");
   display_LCD(2,10, "Cytron Forum");
   delay_ms(1);
   }
    }
   


* This code will work well if I use PIC16F877A

Could anyone help to fix this code so that it can be compiled using High C Pro TECH PIC18, for PIC18F4550? (*Help indeed very much)

[shahrul]

Check configuration bits for PIC18F4550. This is an example

CODE: SELECT_ALL_CODE

#include <htc.h>
#if defined (_16F777)
   __CONFIG(FOSC_HS & WDTE_OFF & PWRTE_ON & BOREN_OFF & MCLRE_ON & CCP2MX_RC1);
   __CONFIG(FCMEN_OFF & IESO_OFF);
   #define _XTAL_FREQ    20000000
#elif defined (_16F877A)
   __CONFIG(FOSC_HS & WDTE_OFF & PWRTE_ON & BOREN_OFF & LVP_OFF);
   #define _XTAL_FREQ    20000000
#elif defined (_16F887)
   __CONFIG(FOSC_HS & WDTE_OFF & PWRTE_ON & BOREN_OFF & CP_ON & MCLRE_ON &   LVP_OFF);
   #define _XTAL_FREQ    20000000
#elif defined (_18F4520)
   __CONFIG(1,HS & FCMDIS & IESODIS);
   __CONFIG(2,PWRTEN & BOREN & BORV20 & WDTDIS & WDTPS32K);
   __CONFIG(3,CCP2RC1 & PBADDIS & LPT1DIS & MCLREN);
   __CONFIG(4,XINSTDIS & STVREN & LVPDIS & DEBUGDIS);
   __CONFIG(5,UNPROTECT);
   __CONFIG(6,UNPROTECT);
   __CONFIG(7,UNPROTECT);
   #define _XTAL_FREQ    20000000
#elif defined (_18F4550)
   __CONFIG(1,USBOSC & CPUDIV1 & PLLDIV5 & HSPLL  & FCMDIS & IESODIS);
   __CONFIG(2,VREGEN & PWRTEN & BOREN & BORV20 & WDTDIS & WDTPS32K);
   __CONFIG(3,CCP2RC1 & PBADDIS & LPT1DIS & MCLREN);
   __CONFIG(4,XINSTDIS & STVREN & LVPDIS & ICPORTDIS & DEBUGDIS);
   __CONFIG(5,UNPROTECT);
   __CONFIG(6,UNPROTECT);
   __CONFIG(7,UNPROTECT);
   #define _XTAL_FREQ    48000000
#elif defined (__dsPIC30F4013__)
   __CONFIG(FOSC, HS);
   __CONFIG(FWDT, WDTDIS);
   __CONFIG(FBORPOR, MCLREN & BORDIS & PWRT64);
   __CONFIG(FGS, GCPU & GWRU);
   __CONFIG(FICD, PGEMU);
   #define _XTAL_FREQ    20000000
#else
   #error PIC not support
#endif


[Nagen Daksh]

Thanks for your kind reply Mr.Shahrul. Appreciate it very much. I have visit your site and I found there is a project similar to the topic about the temperature sensor. Could i get the source code and the ways you make to happen including the method to do PIC development board manually?

[shahrul]

Thanks for your kind reply Mr.Shahrul. Appreciate it very much. I have visit your site and I found there is a project similar to the topic about the temperature sensor. Could i get the source code and the ways you make to happen including the method to do PIC development board manually?

Source code project not for free.

[Nagen Daksh]

Thanks for your kind reply Mr.Shahrul. Appreciate it very much. I have visit your site and I found there is a project similar to the topic about the temperature sensor. Could i get the source code and the ways you make to happen including the method to do PIC development board manually?

Source code project not for free.

How much do you sold it together with the manually done PIC development board?