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Require to code DS1820 with rfpic12F675

 
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sodapopeiei



Joined: 02 May 2006
Posts: 3

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Require to code DS1820 with rfpic12F675
PostPosted: Tue May 02, 2006 11:32 am     Reply with quote

Hi every body,
I'm a new user in PIC. I am trying to use the DS1820 temperature sensor to measure temperature connect to rfpic12F675.
I want to read the temperature and show the results on Hypertyminal
[/b]
sodapopeiei



Joined: 02 May 2006
Posts: 3

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my code ds1820
PostPosted: Wed May 03, 2006 5:06 am     Reply with quote

please check my code ds1820. it doesn't show the results on Hypertyminal . i doesn't understand.


#include <12F675.h>
#use delay(clock=4000000)
#fuses NOWDT,INTRC
#use rs232(baud=9600,xmit=PIN_A2,rcv=PIN_A3)
#define Sensor PIN_A0

int Sensor_Reset(void);
int Sensor_Write(int data);
void Sensor_read(void);
int Temp_H[8],Temp_L[8],i;

void main(){
int temp;
setup_adc_ports(NO_ANALOGS);
setup_adc(ADC_OFF);
printf("\r\nWaiting for a Sensor...\r\n");
while (TRUE) {
while(!Sensor_Reset()) ;
Sensor_Write(0xCC);
Sensor_Write(0x44);
delay_ms(200);
if(Sensor_Reset()){
Sensor_Write(0xCC);
Sensor_Write(0xBE);
Sensor_read();

temp=((Temp_H[0]*64)+(Temp_H[1]*32)+(Temp_H[2]*16)+(Temp_H[3]*8)+(Temp_H[4]*4)+(Temp_H[5]*2)+(Temp_H[6]*1)+(Temp_H[7]?0.51:0.01));
printf("\n\rTemp: %d C\n\r",Temp);
// printf("\n\rTemp: %2.1f C%d%d%d%d%d%d%d%d\n\r",(Temp_L[7]?(-1*Temp):Temp),Temp_L[0],Temp_L[0],Temp_L[2],Temp_L[3],Temp_L[4],Temp_L[5],Temp_L[6],Temp_L[7]);
delay_ms(1000);
}
}
}

int Sensor_Reset(void){
int present;
output_low(Sensor);
delay_us(500);
output_float(Sensor);
delay_us(5);
if(!input(Sensor))
return(FALSE);
delay_us(65);
present=!input(Sensor);
delay_us(240);
if(present)
return(TRUE);
else
return(FALSE);
}


int Sensor_Write(int data){
for(i=1;i<=8;++i){
output_low(Sensor);
delay_us(10);
if(shift_right(&data,1,0)){
output_high(Sensor);
delay_us(10);
}
else{
output_low(Sensor);
delay_us(10);
}
delay_us(50);
output_high(Sensor);
delay_us(50);
}
return(TRUE);
}

void Sensor_read(void){
for(i=0;i<8;i++) {
output_low(Sensor);
delay_us(14);
output_float(Sensor);
delay_us(5);
Temp_H[7-i]=input(Sensor);
delay_us(100);
}
}
Storic



Joined: 03 Dec 2005
Posts: 182
Location: Australia SA

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PostPosted: Wed May 03, 2006 4:05 pm     Reply with quote

Are you getting any thing on hyperterminal. ie ("Temp:" )

ANdrew
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