Zoltan Hudak / Mbed OS DS1820_Hello

Simple DS1820 sensor demo showing how to use the DS1820 library [https://developer.mbed.org/users/hudakz/code/DS1820/]

Dependencies:   DS1820

main.cpp@6:d68db387a734, 2019-01-26 (annotated)

Committer:
hudakz
Date:
Sat Jan 26 21:22:44 2019 +0000
Revision:
6:d68db387a734
Parent:
5:4f7330bb1b64
Child:
7:8beaacebc82d
Updated.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
hudakz 0:77a366f9ba45 1 /*
hudakz 0:77a366f9ba45 2 * Simple DS1820 sensor demo
hudakz 1:fe12bf2ad337 3 *
hudakz 1:fe12bf2ad337 4 * Note: Don't forget to connect a 4.7k Ohm resistor
hudakz 1:fe12bf2ad337 5 * between the DS1820's data pin and the +3.3V pin
hudakz 1:fe12bf2ad337 6 *
hudakz 0:77a366f9ba45 7 */
hudakz 0:77a366f9ba45 8
hudakz 0:77a366f9ba45 9 #include "mbed.h"
hudakz 0:77a366f9ba45 10 #include "DS1820.h"
hudakz 0:77a366f9ba45 11
hudakz 4:d263a2860484 12 Serial pc(USBTX, USBRX);
hudakz 4:d263a2860484 13 DigitalOut led(LED1);
hudakz 6:d68db387a734 14 DS1820 ds1820(PB_11); // substitute p8 with actual mbed pin name connected to the DS1820 data pin
hudakz 4:d263a2860484 15 float temp = 0;
hudakz 4:d263a2860484 16 int result = 0;
hudakz 1:fe12bf2ad337 17
hudakz 0:77a366f9ba45 18 int main() {
hudakz 1:fe12bf2ad337 19
hudakz 0:77a366f9ba45 20 if(ds1820.begin()) {
hudakz 0:77a366f9ba45 21 while(1) {
hudakz 4:d263a2860484 22 ds1820.startConversion(); // start temperature conversion from analog to digital
hudakz 4:d263a2860484 23 wait(1.0); // let DS1820 complete the temperature conversion
hudakz 4:d263a2860484 24 result = ds1820.read(temp); // read temperature from DS1820 and perform cyclic redundancy check (CRC)
hudakz 4:d263a2860484 25 switch(result) {
hudakz 4:d263a2860484 26 case 0: // no errors -> 'temp' contains the value of measured temperature
hudakz 4:d263a2860484 27 pc.printf("temp = %3.1f%cC\r\n", temp, 176);
hudakz 4:d263a2860484 28 break;
hudakz 4:d263a2860484 29 case 1: // no sensor present -> 'temp' is not updated
hudakz 4:d263a2860484 30 pc.printf("no sensor present\n\r");
hudakz 4:d263a2860484 31 break;
hudakz 4:d263a2860484 32 case 2: // CRC error -> 'temp' is not updated
hudakz 4:d263a2860484 33 pc.printf("CRC error\r\n");
hudakz 4:d263a2860484 34 }
hudakz 4:d263a2860484 35 led = !led;
hudakz 0:77a366f9ba45 36 }
hudakz 0:77a366f9ba45 37 } else
hudakz 4:d263a2860484 38 pc.printf("No DS1820 sensor found!\r\n");
hudakz 0:77a366f9ba45 39 }
hudakz 1:fe12bf2ad337 40
hudakz 4:d263a2860484 41 // Array of sensors:
hudakz 1:fe12bf2ad337 42
hudakz 1:fe12bf2ad337 43 //int main() {
hudakz 1:fe12bf2ad337 44 // DS1820 ds1820[3] = {DS1820(PA_8), DS1820(PA_9), DS1820(PC_7)};
hudakz 1:fe12bf2ad337 45 //
hudakz 1:fe12bf2ad337 46 // for(int i = 0; i < 3; i++) {
hudakz 1:fe12bf2ad337 47 // if(!ds1820[i].begin()) {
hudakz 3:eb195375cde7 48 // serial.printf("Cannot find sensor %d", i);
hudakz 1:fe12bf2ad337 49 // } else
hudakz 1:fe12bf2ad337 50 // ds1820[i].startConversion();
hudakz 2:a680194ce6df 51 // }
hudakz 2:a680194ce6df 52 // wait(1.0); // let DS1820s complete the temperature conversion
hudakz 1:fe12bf2ad337 53 // while(1) {
hudakz 1:fe12bf2ad337 54 // for(int i = 0; i < 3; i++) {
hudakz 3:eb195375cde7 55 // if(ds1820[i].isPresent() {
hudakz 2:a680194ce6df 56 // serial.printf("temp%d = %3.1f\r\n", i, ds1820[i].read()); // read temperature
hudakz 2:a680194ce6df 57 // ds1820[i].startConversion(); // start temperature conversion
hudakz 2:a680194ce6df 58 // }
hudakz 1:fe12bf2ad337 59 // }
hudakz 1:fe12bf2ad337 60 // wait(1.0); // let DS1820s complete the temperature conversion
hudakz 1:fe12bf2ad337 61 // }
hudakz 1:fe12bf2ad337 62 //}
hudakz 3:eb195375cde7 63 //
hudakz 1:fe12bf2ad337 64
hudakz 1:fe12bf2ad337 65
hudakz 1:fe12bf2ad337 66
hudakz 6:d68db387a734 67
hudakz 6:d68db387a734 68