azakuri
Joined: 02 Aug 2008
Posts: 4
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| pic16f877 with 2 ds18s20 |
 Posted: Tue Sep 02, 2008 6:36 am |
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again...after along moment, i had studied the ds18s20 and i tried to make the coding but it seems many errors occurs...i just need to make sure this thing happen.
1. sensor 1 - sensor 2 and result in celcius display on lcd.
2. when both sensor differ > 50 degree the buzzer and red led will activate.
3. when it differ between 30 to 50 yellow led will activate.
4. when it differ less than 30 degree, green led will activate.
| Code: | #include < 16F877.H >
#include < jonsinc.h >
#fuses XT, NOPROTECT, NOPUT, NOWDT, NOBROWNOUT, NOLVP, NOCPD, NOWRT
#define DS1820_DATA_IN_PIN PIN_C0
#define DS1820_FET_CONTROL_PIN PIN_C1
#define DS1820_SKIP_ROM 0xCC
#define DS1820_READ_SCRATCHPAD 0xBE
#define DS1820_CONVERT_T 0x44
// LCD STUFF
#define LCD_D3 PIN_RB3
#define LCD_D4 PIN_RB4
#define LCD_D5 PIN_RB5
#define LCD_D6 PIN_RB6
#define LCD_D7 PIN_RB7
#define LCD_EN PIN_RE1
#define LCD_RS PIN_RE0
#define LINE_1 0x00
#define LINE_2 0x40
#define CLEAR_DISP 0x01
#define DEGREE_SYM 0xdf
#use delay ( clock=6000000 )
#use standard_io ( A )
#use standard_io ( B )
#use standard_io ( C )
void ResetDS1820 ( void );
void WriteDS1820 ( void );
void ReadDS1820 ( void );
void WaitForConversion ( void );
void LCD_Init ( void );
void LCD_SetPosition ( unsigned int cX );
void LCD_PutChar ( unsigned int cX );
void LCD_PutCmd ( unsigned int cX );
void LCD_PulseEnable ( void );
void LCD_SetData ( unsigned int cX );
static char cShiftBit,cDataOut;
static long iTemperature,iDataIn;
void main ( void )
{
delay_ms ( 200 );
LCD_Init();
LCD_SetPosition ( LINE_1 + 0 );
printf ( LCD_PutChar, "Temperature is" );
while ( TRUE )
{
ResetDS1820();
cDataOut = DS1820_SKIP_ROM;
WriteDS1820();
cDataOut = DS1820_CONVERT_T;
WriteDS1820();
WaitForConversion();
ResetDS1820();
cDataOut = DS1820_SKIP_ROM;
WriteDS1820();
cDataOut = DS1820_READ_SCRATCHPAD;
WriteDS1820();
ReadDS1820();
iTemperature = iDataIn / 2;
LCD_SetPosition ( LINE_2 + 5 );
printf ( LCD_PutChar, "%lu%cC %lu%cF ", iTemperature, DEGREE_SYM, ( ( 9 * iTemperature ) / 5 ) + 32, DEGREE_SYM );
}
}
void ResetDS1820 ( void )
{
output_low ( DS1820_DATA_IN_PIN );
delay_us ( 480 );
output_float ( DS1820_DATA_IN_PIN );
delay_us ( 480 );
}
void WriteDS1820 ( void )
{
for ( cShiftBit = 1; cShiftBit <= 8; ++cShiftBit )
{
output_low ( DS1820_DATA_IN_PIN );
delay_us ( 5 );
output_bit ( DS1820_DATA_IN_PIN, shift_right ( &cDataOut, 1, 0 ) );
delay_us ( 60 );
output_float ( DS1820_DATA_IN_PIN );
delay_us ( 5 );
}
//delay_us ( 200 );
}
void ReadDS1820 ( void )
{
iDataIn = 0;
for ( cShiftBit = 1; cShiftBit <= 16; ++cShiftBit )
{
output_low ( DS1820_DATA_IN_PIN );
delay_us ( 5 );
output_float ( DS1820_DATA_IN_PIN );
delay_us ( 5 );
shift_right ( &iDataIn, 2, input ( DS1820_DATA_IN_PIN ) );
delay_us ( 55 );
}
ResetDS1820();
}
void WaitForConversion ( void )
{
while ( TRUE )
{
output_low ( DS1820_DATA_IN_PIN );
delay_us ( 5 );
output_float ( DS1820_DATA_IN_PIN );
delay_us ( 5 );
if ( input ( DS1820_DATA_IN_PIN ) == 1 )
{
break;
}
delay_us ( 55 );
}
}
void LCD_Init ( void )
{
LCD_SetData ( 0x00 );
delay_ms ( 200 );
output_low ( LCD_RS );
LCD_SetData ( 0x03 );
LCD_PulseEnable();
LCD_PulseEnable();
LCD_PulseEnable();
LCD_SetData ( 0x02 );
LCD_PulseEnable();
LCD_PutCmd ( 0x2C );
LCD_PutCmd ( 0x0C );
LCD_PutCmd ( 0x01 );
LCD_PutCmd ( 0x06 );
}
void LCD_SetPosition ( unsigned int cX )
{
// this subroutine works specifically for 4-bit Port A
LCD_SetData ( swap ( cX ) | 0x08 );
LCD_PulseEnable();
LCD_SetData ( swap ( cX ) );
LCD_PulseEnable();
}
void LCD_PutChar ( unsigned int cX )
{
// this subroutine works specifically for 4-bit Port A
output_high ( LCD_RS );
LCD_SetData ( swap ( cX ) );
LCD_PulseEnable();
LCD_SetData ( swap ( cX ) );
LCD_PulseEnable();
output_low ( LCD_RS );
}
void LCD_PutCmd ( unsigned int cX )
{
// this subroutine works specifically for 4-bit Port A
LCD_SetData ( swap ( cX ) );
LCD_PulseEnable();
LCD_SetData ( swap ( cX ) );
LCD_PulseEnable();
}
void LCD_PulseEnable ( void )
{
output_high ( LCD_EN );
delay_us ( 10 );
output_low ( LCD_EN );
delay_ms ( 5 );
}
void LCD_SetData ( unsigned int cX )
{
output_bit ( LCD_D0, cX & 0x01 );
output_bit ( LCD_D1, cX & 0x02 );
output_bit ( LCD_D2, cX & 0x04 );
output_bit ( LCD_D3, cX & 0x08 );
}
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