Termometro

[neocommandos]

     Hola foro,
alguien ha manejado el DS1820 para hacer un termometro?
Quiero hacer un termometro y presentar la temperatura sobre un LCD de 2 lineas. ¿Como se inicializa? ¿Como se maneja?

[J1M]

en el CCS tienes este ejemplo:

Codigo:
/////////////////////////////////////////////////////////////////////////
////                             EX_1920.C                           ////
////                                                                 ////
////  This program interfaces a Dallas DS1920 touch memory device.   ////
////  It will display the temperature reading of the device it       ////
////  "touches" with pin B0.                                         ////
////                                                                 ////
////  Configure the CCS prototype card as follows:                   ////
////     Connect pin B0 (47) through a 4.7K resistor to 5V (28)      ////
////     Connect the touch device to ground and then "Touch" to B0   ////
////     See additional connections below.                           ////
////                                                                 ////
////  The device requires 2 seconds of contact to charge enough power////
////  for the temperature conversion.                                ////
////                                                                 ////
////  This example will work with the PCB, PCM and PCH compilers.    ////
////  The following conditional compilation lines are used to        ////
////  include a valid device for each compiler.  Change the device,  ////
////  clock and RS232 pins for your hardware if needed.              ////
/////////////////////////////////////////////////////////////////////////
////        (C) Copyright 1996,2003 Custom Computer Services         ////
//// This source code may only be used by licensed users of the CCS  ////
//// C compiler.  This source code may only be distributed to other  ////
//// licensed users of the CCS C compiler.  No other use,            ////
//// reproduction or distribution is permitted without written       ////
//// permission.  Derivative programs created using this software    ////
//// in object code form are not restricted in any way.              ////
/////////////////////////////////////////////////////////////////////////


#if defined(__PCB__)
#include <16c56.h>
#fuses HS,NOWDT,NOPROTECT
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_A3, rcv=PIN_A2)  // Jumpers: 11 to 17, 12 to 18

#elif defined(__PCM__)
#include <16F877.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)  // Jumpers: 8 to 11, 7 to 12

#elif defined(__PCH__)
#include <18F452.h>
#fuses HS,NOPROTECT,NOLVP
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)  // Jumpers: 8 to 11, 7 to 12
#endif

#include <touch.c>
#include <string.h>
#include <stdlib.h>


void main() {
   byte buffer[2];

   printf("
Temperature requires atleast 2 seconds of contact.");
   printf("
Waiting for a touch device...
");

   while (TRUE) {
     if(touch_present()) {
        touch_write_byte(0xCC);
        touch_write_byte (0x44);
        output_high(TOUCH_PIN);
        delay_ms(2000);

        touch_present();
        touch_write_byte(0xCC);
        touch_write_byte (0xBE);
        buffer[0] = touch_read_byte();
        buffer[1] = touch_read_byte();

        printf ("
Temperature: %c%3.1f C", (buffer[1])?"-":" ", (float)buffer[0]/2);
        delay_ms (1000);
     }
  }
}

Salu2!

[neocommandos]

Gracias Venum, voy  a probarlo a ver que tal va.

[neocommandos]

Probe el ejemplo del CCS con el sensor DS1820, pero no funciona, permanentemente muestra un valor, creo recordar que era 257.16, independientemente de la temperatura que haya, eso si, cuando se desconecta el DS1820 del circuito, en pantalla aparece .0 ºC

Esa misma libreria del DS1920 sirve para el DS1820? Alguien tiene echo algun ejemplo.

Gracias.