DS1820 Class Reference

 Single sensor.

 #include "mbed.h"
 #include "DS1820.h"
 
 Serial      pc(USBTX, USBRX);
 DigitalOut  led(LED1);
 DS1820      ds1820(D8);  // substitute D8 with actual mbed pin name connected to 1-wire bus
 float       temp = 0;
 int         result = 0;
 
 int main()
 {
     pc.printf("\r\n--Starting--\r\n");
     if (ds1820.begin()) {
         while (1) {
             ds1820.startConversion();   // start temperature conversion from analog to digital
             wait(1.0);                  // let DS1820 complete the temperature conversion
             result = ds1820.read(temp); // read temperature from DS1820 and perform cyclic redundancy check (CRC)
             switch (result) {
                 case 0:                 // no errors -> 'temp' contains the value of measured temperature
                     pc.printf("temp = %3.1f%cC\r\n", temp, 176);
                     break;
 
                 case 1:                 // no sensor present -> 'temp' is not updated
                     pc.printf("no sensor present\n\r");
                     break;
 
                 case 2:                 // CRC error -> 'temp' is not updated
                     pc.printf("CRC error\r\n");
             }
 
             led = !led;
         }
     }
     else
         pc.printf("No DS1820 sensor found!\r\n");
 }
 
 
 More sensors connected to the same 1-wire bus.
 
 #include "mbed.h"
 #include "DS1820.h"
 
 #define     SENSORS_COUNT   64      // number of DS1820 sensors to be connected to the 1-wire bus (max 256)
 
 Serial      pc(USBTX, USBRX);
 DigitalOut  led(LED1);
 OneWire     oneWire(D8);            // substitute D8 with actual mbed pin name connected to the DS1820 data pin
 DS1820*     ds1820[SENSORS_COUNT];
 int         sensors_found = 0;      // counts the actually found DS1820 sensors
 float       temp = 0;
 int         result = 0;
 
 int main() {
     int i = 0;
     
     pc.printf("\r\n Starting \r\n");
     //Enumerate (i.e. detect) DS1820 sensors on the 1-wire bus
     for(i = 0; i < SENSORS_COUNT; i++) {
         ds1820[i] = new DS1820(&oneWire);
         if(!ds1820[i]->begin()) {
             delete ds1820[i];
             break;
         }
     }
     
     sensors_found = i;
     
     if (sensors_found == 0) {
         pc.printf("No DS1820 sensor found!\r\n");
         return -1;
     }
     else
         pc.printf("Found %d sensors.\r\n", sensors_found);
     
     while(1) {
         pc.printf("-------------------\r\n");
         for(i = 0; i < sensors_found; i++)
             ds1820[i]->startConversion();   // start temperature conversion from analog to digital       
         wait(1.0);                          // let DS1820s complete the temperature conversion
         for(int i = 0; i < sensors_found; i++) {
             if(ds1820[i]->isPresent())
                 pc.printf("temp[%d] = %3.1f%cC\r\n", i, ds1820[i]->read(), 176);     // read temperature
         }
     }
 }