LM35 Code

AtomSoft · Oct 20, 2009

Hey guys i just got my LM35 in the mail and am glad to say its so much easier to use than the LM75 heh.. Here is a picture from ISIS.. It works well live also:

Below the picture is full source code for LCD, LM35 (ADC MANUALLY)

**broken link removed**

OR

LM35_ADC.zip

AtomSoft · Oct 20, 2009

Tested again and might cause extra character to appear on LCD so here is new main.c file:

Code:

/* *****************************************************************************
;                                                                             *
;    Filename:                     				                              *
;    Date:                                         	                          *
;    File Version: 001                                                        *
;                                                                             *
;    Author:   Jason Lopez                                                    *
;    Company:  AtomSoft                                                       *
;                                                                             *
;***************************************************************************** */

#include <p18F4620.h>
#include <delays.h>
#include <string.h>
#include "lcd.h"

#pragma config WDT = OFF, LVP = OFF, OSC = HS, XINST = OFF


/************************************
Prototypes
*************************************/
void main(void);
unsigned char DECtoBCD(unsigned char DEC);
unsigned char DECtoASCII(unsigned char DEC,char part);
/************************************
Variables and Defines
*************************************/
    #define ADCPin TRISAbits.TRISA0 // RA0/AN0 TRIS (DATA DIRECTION REGISTER)

    unsigned int result; //Result Variable
    unsigned int DegC;   //Result in Celsius 
    unsigned int DegF;   //Result in Fahrenheit

    unsigned char lcdtmp[10];
/************************************
Main
*************************************/
void main(void){
    ADCPin = 1;                     //AN0 = Input
    ADCON0 = 0x00;                  //BIT 7:6 Always 00, BIT 5:2 is 0000 for Channel 0 (AN0),
                                    //BIT 1:0 is 00 (A/D Idle and Module is off) until we are done setting up
    ADCON1 = 0x0E;                  //BIT 7:6 Always 00, BIT 5 is 0 for VSS, BIT 4 is 0 for VDD
                                    //BIT 3:0 is 1110 for all digital expect AN0. We need it analog so we can convert it.
    ADCON2 = 0b10001101;            //BIT 7 is 0 for Left Justified, BIT 6 Always 0, BIT 5:3 001 for 2 TAD (A/D Acquisition Time)
                                    //BIT 2:0 is 100 for FOSC/4 for A/D Conversion Clock
    ADCON0bits.ADON = 1;            //Turn on the A/D module
    
    LCD_Init();
    DelayMS(100);

    LCD_LINE(1);
    LCD_STR((unsigned rom char*)"  AtomSoftTech  ");

    LCD_LINE(2);
    LCD_STR((unsigned rom char*)"Temp: ");

	while(1){
        ADCON0bits.GO = 1;          //Start the conversion
        while(ADCON0bits.DONE);     //Wait until it’s done
        result = ADRESH;            //Load ADRESH into result
        result <<= 8;               //Shift over Result 8 bits to the left
        result |= ADRESL;           //OR in our LOW byte to finish off out INT
        DegC = (result*5)/10;
        DegC--;

        DegF = DegC * 9;
        DegF/=5;
        DegF+=32;

        lcdtmp[0] = DECtoASCII(DegC,'h');
        lcdtmp[1] = DECtoASCII(DegC,'l');
        lcdtmp[2] = 'C';
        lcdtmp[3] = '-';
        lcdtmp[4] = DECtoASCII(DegF,'h');
        lcdtmp[5] = DECtoASCII(DegF,'l');
        lcdtmp[6] = 'F';
        lcdtmp[7] = lcdtmp[8]  = lcdtmp[9] = ' ';

        LCD_LINE(2);
        LCD_STR((unsigned rom char*)"Temp: ");
        LCD_STR2(lcdtmp);
        DelayMS(1000);

	}
}

unsigned char DECtoASCII(unsigned char DEC,char part){
unsigned char temp;
unsigned char myData;
    temp = DECtoBCD(DEC);

    if(part == 'l')
        myData = temp & 0x0F; 

    if(part == 'h') 
        myData = (temp >> 4) & 0x0F;
    
    myData += 0x30;
    return myData;
}
unsigned char DECtoBCD(unsigned char DEC){
unsigned char temph;
unsigned char templ;
unsigned char myData;
    templ = DEC % 10;
    temph = DEC / 10; 
    myData = (temph << 4) | templ;
    
    return myData; //Return myData
}

bryan · Oct 20, 2009

AtomSoft:

Appears the zip file is corrupt. Will not open.

AtomSoft · Oct 20, 2009

Sorry about above zip try this one:
https://www.electro-tech-online.com/attachments/lm35_adc-zip.34565/

OR THIS ONE:

**broken link removed**

Actual Images: (PROOF) heh

bryan · Oct 20, 2009

The one from your web site works, but the ET attachment doesn't. Strange.

AtomSoft · Oct 20, 2009

yeah i had a feeling, the site doesnt like me no more

but heh ill still contribute

AtomSoft · Oct 20, 2009

Heh more update:

This code averages 10 readings all 10mS apart. So it takes 100ms to get 1 stable reading but heh its worth it...

Code:

/* *****************************************************************************
;                                                                             *
;    Filename:                     				                              *
;    Date:                                         	                          *
;    File Version: 001                                                        *
;                                                                             *
;    Author:   Jason Lopez                                                    *
;    Company:  AtomSoft                                                       *
;                                                                             *
;***************************************************************************** */

#include <p18F4620.h>
#include <delays.h>
#include <string.h>
#include "lcd.h"

#pragma config WDT = OFF, LVP = OFF, OSC = HS, XINST = OFF


/************************************
Prototypes
*************************************/
void main(void);
unsigned char DECtoBCD(unsigned char DEC);
unsigned char DECtoASCII(unsigned char DEC,char part);
/************************************
Variables and Defines
*************************************/
    #define ADCPin TRISAbits.TRISA0 // RA0/AN0 TRIS (DATA DIRECTION REGISTER)

    unsigned int result; //Result Variable
    unsigned int DegC;   //Result in Celsius 
    unsigned int DegF;   //Result in Fahrenheit

    unsigned char lcdtmp[10];
    unsigned char avg[10];

/************************************
Main
*************************************/
void main(void){
    unsigned char tmp;

    ADCPin = 1;                     //AN0 = Input
    ADCON0 = 0x00;                  //BIT 7:6 Always 00, BIT 5:2 is 0000 for Channel 0 (AN0),
                                    //BIT 1:0 is 00 (A/D Idle and Module is off) until we are done setting up
    ADCON1 = 0x0E;                  //BIT 7:6 Always 00, BIT 5 is 0 for VSS, BIT 4 is 0 for VDD
                                    //BIT 3:0 is 1110 for all digital expect AN0. We need it analog so we can convert it.
    ADCON2 = 0b10001101;            //BIT 7 is 0 for Left Justified, BIT 6 Always 0, BIT 5:3 001 for 2 TAD (A/D Acquisition Time)
                                    //BIT 2:0 is 100 for FOSC/4 for A/D Conversion Clock
    ADCON0bits.ADON = 1;            //Turn on the A/D module
    
    LCD_Init();
    DelayMS(100);

    LCD_LINE(1);
    LCD_STR((unsigned rom char*)"  AtomSoftTech  ");

    LCD_LINE(2);
    LCD_STR((unsigned rom char*)"Temp: ");

	while(1){
      for(tmp=0;tmp<10;tmp++){
        ADCON0bits.GO = 1;          //Start the conversion
        while(ADCON0bits.DONE);     //Wait until it’s done
        result = ADRESH;            //Load ADRESH into result
        result <<= 8;               //Shift over Result 8 bits to the left
        result |= ADRESL;           //OR in our LOW byte to finish off out INT
        avg[tmp] = result;  
        DelayMS(10);
      }       
        result = 0;
        for(tmp=0;tmp<10;tmp++){
            result += avg[tmp];
        }
        result /= 10;
        
        DegC = (result*5)/10;
        DegC--;

        DegF = DegC * 9;
        DegF/=5;
        DegF+=32;

        lcdtmp[0] = DECtoASCII(DegC,'h');
        lcdtmp[1] = DECtoASCII(DegC,'l');
        lcdtmp[2] = 'C';
        lcdtmp[3] = '-';
        lcdtmp[4] = DECtoASCII(DegF,'h');
        lcdtmp[5] = DECtoASCII(DegF,'l');
        lcdtmp[6] = 'F';
        lcdtmp[7] = lcdtmp[8]  = lcdtmp[9] = ' ';

        LCD_LINE(2);
        LCD_STR((unsigned rom char*)"Temp: ");
        LCD_STR2(lcdtmp);
        DelayMS(1000);
        DelayMS(1000);
	}
}

unsigned char DECtoASCII(unsigned char DEC,char part){
unsigned char temp;
unsigned char myData;
    temp = DECtoBCD(DEC);

    if(part == 'l')
        myData = temp & 0x0F; 

    if(part == 'h') 
        myData = (temp >> 4) & 0x0F;
    
    myData += 0x30;
    return myData;
}
unsigned char DECtoBCD(unsigned char DEC){
unsigned char temph;
unsigned char templ;
unsigned char myData;
    templ = DEC % 10;
    temph = DEC / 10; 
    myData = (temph << 4) | templ;
    
    return myData; //Return myData
}

Mr RB · Oct 20, 2009

If you wanted to use it, the text LCD should display the "degree" character, I think it is 11011111 binary.

AtomSoft · Oct 20, 2009

... edit that you are correct... thanks

HEX: 0xDF

AtomSoft · Oct 20, 2009

Here is the new code... Thanks for the tip

Code:

/* *****************************************************************************
;                                                                             *
;    Filename:                     				                              *
;    Date:                                         	                          *
;    File Version: 001                                                        *
;                                                                             *
;    Author:   Jason Lopez                                                    *
;    Company:  AtomSoft                                                       *
;                                                                             *
;***************************************************************************** */

#include <p18F4620.h>
#include <delays.h>
#include <string.h>
#include "lcd.h"

#pragma config WDT = OFF, LVP = OFF, OSC = HS, XINST = OFF


/************************************
Prototypes
*************************************/
void main(void);
unsigned char DECtoBCD(unsigned char DEC);
unsigned char DECtoASCII(unsigned char DEC,char part);
/************************************
Variables and Defines
*************************************/
    #define ADCPin TRISAbits.TRISA0 // RA0/AN0 TRIS (DATA DIRECTION REGISTER)

    unsigned int result; //Result Variable
    unsigned int DegC;   //Result in Celsius 
    unsigned int DegF;   //Result in Fahrenheit

    unsigned char lcdtmp[10];
    unsigned char avg[10];

/************************************
Main
*************************************/
void main(void){
    unsigned char tmp;

    ADCPin = 1;                     //AN0 = Input
    ADCON0 = 0x00;                  //BIT 7:6 Always 00, BIT 5:2 is 0000 for Channel 0 (AN0),
                                    //BIT 1:0 is 00 (A/D Idle and Module is off) until we are done setting up
    ADCON1 = 0x0E;                  //BIT 7:6 Always 00, BIT 5 is 0 for VSS, BIT 4 is 0 for VDD
                                    //BIT 3:0 is 1110 for all digital expect AN0. We need it analog so we can convert it.
    ADCON2 = 0b10001101;            //BIT 7 is 0 for Left Justified, BIT 6 Always 0, BIT 5:3 001 for 2 TAD (A/D Acquisition Time)
                                    //BIT 2:0 is 100 for FOSC/4 for A/D Conversion Clock
    ADCON0bits.ADON = 1;            //Turn on the A/D module
    
    LCD_Init();
    DelayMS(100);

    LCD_LINE(1);
    LCD_STR((unsigned rom char*)"  AtomSoftTech  ");

    LCD_LINE(2);
    LCD_STR((unsigned rom char*)"Temp: ");

	while(1){
      for(tmp=0;tmp<10;tmp++){
        ADCON0bits.GO = 1;          //Start the conversion
        while(ADCON0bits.DONE);     //Wait until it’s done
        result = ADRESH;            //Load ADRESH into result
        result <<= 8;               //Shift over Result 8 bits to the left
        result |= ADRESL;           //OR in our LOW byte to finish off out INT
        avg[tmp] = result;  
        DelayMS(10);
      }       
        result = 0;
        for(tmp=0;tmp<10;tmp++){
            result += avg[tmp];
        }
        result /= 10;
        
        DegC = (result*5)/10;
        DegC--;

        DegF = DegC * 9;
        DegF/=5;
        DegF+=32;

        lcdtmp[0] = DECtoASCII(DegF,'h');
        lcdtmp[1] = DECtoASCII(DegF,'l');
        lcdtmp[2] = 0xDF;
        lcdtmp[3] = 'F';
        lcdtmp[4] = ' ';
        lcdtmp[5] = DECtoASCII(DegC,'h');
        lcdtmp[6] = DECtoASCII(DegC,'l');
        lcdtmp[7] = 0xDF;
        lcdtmp[8] = 'C';
        lcdtmp[9] = ' ';

        LCD_LINE(2);
        LCD_STR((unsigned rom char*)"Temp: ");
        LCD_STR2(lcdtmp);
        DelayMS(1000);
        DelayMS(1000);
	}
}

unsigned char DECtoASCII(unsigned char DEC,char part){
unsigned char temp;
unsigned char myData;
    temp = DECtoBCD(DEC);

    if(part == 'l')
        myData = temp & 0x0F; 

    if(part == 'h') 
        myData = (temp >> 4) & 0x0F;
    
    myData += 0x30;
    return myData;
}
unsigned char DECtoBCD(unsigned char DEC){
unsigned char temph;
unsigned char templ;
unsigned char myData;
    templ = DEC % 10;
    temph = DEC / 10; 
    myData = (temph << 4) | templ;
    
    return myData; //Return myData
}

Noggin · Oct 21, 2009

AtomSoft said:
Heh more update:

This code averages 10 readings all 10mS apart. So it takes 100ms to get 1 stable reading but heh its worth it...

You wouldn't be able to read it that fast anyway

But if it bothers you, you could use that digital_filter code I put in your other thread.

Edit: I just went and looked at your code a bit more closely. You have delays of several seconds in the code, I don't think you're worried about the 100mS you spend reading the ADC so nevermind.

AtomSoft · Oct 21, 2009

heh as long as it is accurate ill be happy

rezaify · Nov 23, 2009

Tanks very much.

sundanees · Nov 23, 2009

AtomSoft said:
yeah i had a feeling, the site doesnt like me no more but heh ill still contribute

please......i'm need password lcdn6100 project

AtomSoft · Nov 23, 2009

if you look on the forum you will find my code with no password

sundanees · Nov 23, 2009

AtomSoft said:
if you look on the forum you will find my code with no password

hallo boss....i'm need password lcd N6100 project

techies · Dec 3, 2009

omg this is nice..thank you for the information..at least i got some references. =)

AtomSoft · Dec 3, 2009

your welcome

nidhin1806 · Dec 3, 2009

good project btw.

ghostman11 · Dec 5, 2009

nice one jason, i been studying your code while i learn, much of it goes over my head but i am starting to understand parts of it! is amazing how much and how quick i can learn on this site. i might to start taking back all the bad things ive said about the net

Welcome to our site!

Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

LM35 Code

Well-Known Member

Attachments

Well-Known Member

Member

Well-Known Member

Attachments

Member

Well-Known Member

Well-Known Member

Well-Known Member

Well-Known Member

Well-Known Member

Member

Well-Known Member

New Member

New Member

Well-Known Member

New Member

New Member

Well-Known Member

New Member

Well-Known Member

Similar threads

New Articles From Microcontroller Tips