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potentiometer and lcd 2x16 problem...

 
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MrGreen
Guest
potentiometer and lcd 2x16 problem...
PostPosted: Fri Mar 20, 2009 7:32 am     Reply with quote
How can I show the value of potentiometer? The output of potentiometer is connect directly to pin2 (RA0/AN0) Pic16F877. PortD is use for LCD DB4-DB7,RS,EN. PortB is for LED and Buzzer. Below is the code but it doesn't work. Why??
Code:

#include<16F877A.h>
#device ADC=8
#fuses XT,NOWDT,NOPROTECT,NOPUT,NOBROWNOUT,NOLVP
#use delay(clock=4000000)
#include<LCD.C>

#define LCD_EN          PIN_D0     //lcd pin 6
#define LCD_RS          PIN_D1      //lcd pin 4
#define LCD_RW          PIN_D2     //lcd pin 5

#define LCD_D4          PIN_D4   //lcd pin 11
#define LCD_D5          PIN_D5   //lcd pin 12
#define LCD_D6          PIN_D6   //lcd pin 13
#define LCD_D7          PIN_D7   //lcd pin 14

#define LED_BUZZER      PIN_B7
#define LED_GREEN       PIN_B6
#define LED_YELLOW      PIN_B5
#define LED_RED         PIN_B4


void main(){

set_tris_a(0xff);
set_tris_b(0x00);
set_tris_d(0x00);

setup_adc_ports(ALL_ANALOG);
setup_adc(ADC_CLOCK_INTERNAL);

do{
int8 valuepot;
set_adc_channel(0);
delay_ms(50);
valuepot=read_adc();
delay_ms(50);
lcd_init();
}

while(1);
{
float mvpb;
float result;
int8 valuepot;
mvpb=30.5/255.0;
delay_ms(100);
lcd_gotoxy(1,1);
valuepot=input_A();
result=valuepot*mvpb-16.5;

if((result>=5)&&(result<=16.5))
{
   printf(lcd_putc,"Weight:%5.2f kg\n",result);
   lcd_putc("*****TANK:OK******");

            output_low(PIN_B7);
            output_low(PIN_B5);
            output_low(PIN_B4);
     output_high(PIN_B6);
      }

      else if((result>=3)&&(result<5))
      {
      printf(lcd_putc,"Weight:%5.2f kg\n",result);
      lcd_putc("*****TANK:LOW*****");

            output_low(PIN_B7);
            output_low(PIN_B6);
            output_low(PIN_B4);
     output_high(PIN_B5);
      }

      else if((result>=1)&&(result<3))
      {
      printf(lcd_putc,"Weight:%5.2f kg\n",result);
      lcd_putc("**TANK:VERY LOW*****");

            output_low(PIN_B7);
            output_low(PIN_B6);
            output_low(PIN_B4);
     output_high(PIN_B5);
delay_ms(100);
      output_low(PIN_B5);
      }

      else if((result>=0)&&(result<=1))
      {
       printf(lcd_putc,"Weight:%5.2f kg\n",result);
      lcd_putc("TANK:REPLACE NOW");

            output_low(PIN_B7);
            output_low(PIN_B6);
            output_low(PIN_B5);
     output_high(PIN_B4);
      }

      else
      {
       printf(lcd_putc,"Weight:%5.2f kg\n",result);
      lcd_putc("**SORRY!!EMPTY**");
            output_high(PIN_B7);
            output_high(PIN_B6);
            output_high(PIN_B5);
            output_high(PIN_B4);
delay_ms(100);
            output_low(PIN_B7);
            output_low(PIN_B6);
            output_low(PIN_B5);
            output_low(PIN_B4);
      delay_ms(100);
      }
      delay_ms(1000);
}
 }

Anybody plzzz help me...
Ttelmah
Guest
PostPosted: Fri Mar 20, 2009 8:14 am     Reply with quote
I'll make two comments:
1) Switch to C variable declarations. Only declare variables at the start of a named function. The ability to declare variables inside 'sections', is a latter construct, and though CCS 'supposedly' supports this, it gains nothing, and quite often leads to problems....
2) Think through your constructs.
Code:

Do {

} while(TRUE);

executes _for ever_. How is any code after this going to run?.

Best Wishes
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

View user's profile Send private message

PostPosted: Fri Mar 20, 2009 10:29 am     Reply with quote
Here is a test program to read a trimpot on pin AN0 and display the
voltage on an LCD. Try this program first. It will show if your hardware
is working OK:
http://www.ccsinfo.com/forum/viewtopic.php?t=32168&start=1
MrGreen
Guest
:-/
PostPosted: Sat Mar 21, 2009 8:08 am     Reply with quote
i still dont get it...anybody plzz help me ...
picoman



Joined: 17 May 2009
Posts: 1

View user's profile Send private message

Re: potentiometer and lcd 2x16 problem...
PostPosted: Sun May 17, 2009 7:27 am     Reply with quote
Code:

#include<16F877A.h>
#device ADC=8
#fuses XT,NOWDT,NOPROTECT,NOPUT,NOBROWNOUT,NOLVP
#use delay(clock=4000000)
#include<LCD.C>

#define LCD_EN          PIN_D0     //lcd pin 6
#define LCD_RS          PIN_D1      //lcd pin 4
#define LCD_RW          PIN_D2     //lcd pin 5

#define LCD_D4          PIN_D4   //lcd pin 11
#define LCD_D5          PIN_D5   //lcd pin 12
#define LCD_D6          PIN_D6   //lcd pin 13
#define LCD_D7          PIN_D7   //lcd pin 14

#define LED_BUZZER      PIN_B7
#define LED_GREEN       PIN_B6
#define LED_YELLOW      PIN_B5
#define LED_RED         PIN_B4


void main(){

set_tris_a(0xff);
set_tris_b(0x00);
set_tris_d(0x00);

setup_adc_ports(ALL_ANALOG);
setup_adc(ADC_CLOCK_INTERNAL);

do{
int8 valuepot;
set_adc_channel(0);
delay_ms(50);
valuepot=read_adc();
delay_ms(50);
lcd_init();
}

while(1);
{
float mvpb;
float result;
int8 valuepot;
mvpb=30.5/255.0;
delay_ms(100);
lcd_gotoxy(1,1);
valuepot=input_A();
result=valuepot*mvpb-16.5;

if((result>=5)&&(result<=16.5))
{
   printf(lcd_putc,"Weight:%5.2f kg\n",result);
   lcd_putc("*****TANK:OK******");

            output_low(PIN_B7);
            output_low(PIN_B5);
            output_low(PIN_B4);
     output_high(PIN_B6);
      }

      else if((result>=3)&&(result<5))
      {
      printf(lcd_putc,"Weight:%5.2f kg\n",result);
      lcd_putc("*****TANK:LOW*****");

            output_low(PIN_B7);
            output_low(PIN_B6);
            output_low(PIN_B4);
     output_high(PIN_B5);
      }

      else if((result>=1)&&(result<3))
      {
      printf(lcd_putc,"Weight:%5.2f kg\n",result);
      lcd_putc("**TANK:VERY LOW*****");

            output_low(PIN_B7);
            output_low(PIN_B6);
            output_low(PIN_B4);
     output_high(PIN_B5);
delay_ms(100);
      output_low(PIN_B5);
      }

      else if((result>=0)&&(result<=1))
      {
       printf(lcd_putc,"Weight:%5.2f kg\n",result);
      lcd_putc("TANK:REPLACE NOW");

            output_low(PIN_B7);
            output_low(PIN_B6);
            output_low(PIN_B5);
     output_high(PIN_B4);
      }

      else
      {
       printf(lcd_putc,"Weight:%5.2f kg\n",result);
      lcd_putc("**SORRY!!EMPTY**");
            output_high(PIN_B7);
            output_high(PIN_B6);
            output_high(PIN_B5);
            output_high(PIN_B4);
delay_ms(100);
            output_low(PIN_B7);
            output_low(PIN_B6);
            output_low(PIN_B5);
            output_low(PIN_B4);
      delay_ms(100);
      }
      delay_ms(1000);
}
 }


Is very interesting this application.
I want to that realize this application but with load cells weight and d'not know how calibrate this .
Please, dear friend what is reprezent mvpb=30.5 / 255.0 and 16.5 value ?
Thank you very much!
Mirel
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