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@13:06a3997b1557, 2020-07-20 (annotated)

Committer:
hudakz
Date:
Mon Jul 20 08:10:43 2020 +0000
Revision:
13:06a3997b1557
Parent:
12:34123e51ac35 
Simple DS1820 sensor demo

Who changed what in which revision?

UserRevisionLine numberNew contents of line
hudakz 0:77a366f9ba45 1 /*
hudakz 10:739d1a7a4b1b 2 * Simple example program
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 10:739d1a7a4b1b 8
hudakz 10:739d1a7a4b1b 9 /* Single DS1820 sensor: */
hudakz 9:1d1c57840c7e 10 /*
hudakz 0:77a366f9ba45 11 #include "mbed.h"
hudakz 0:77a366f9ba45 12 #include "DS1820.h"
hudakz 0:77a366f9ba45 13
hudakz 4:d263a2860484 14 Serial pc(USBTX, USBRX);
hudakz 4:d263a2860484 15 DigitalOut led(LED1);
hudakz 10:739d1a7a4b1b 16 DS1820 ds1820(D8); // substitute D8 with the actual pin name connected to the DS1820 sensor
hudakz 4:d263a2860484 17 float temp = 0;
hudakz 7:8beaacebc82d 18 int result = 0;
hudakz 7:8beaacebc82d 19
hudakz 7:8beaacebc82d 20 int main()
hudakz 7:8beaacebc82d 21 {
hudakz 7:8beaacebc82d 22 if (ds1820.begin()) {
hudakz 7:8beaacebc82d 23 while (1) {
hudakz 7:8beaacebc82d 24 ds1820.startConversion(); // start temperature conversion from analog to digital
hudakz 12:34123e51ac35 25 ThisThread::sleep_for(1000);// let DS1820 complete the temperature conversion
hudakz 4:d263a2860484 26 result = ds1820.read(temp); // read temperature from DS1820 and perform cyclic redundancy check (CRC)
hudakz 7:8beaacebc82d 27 switch (result) {
hudakz 7:8beaacebc82d 28 case 0: // no errors -> 'temp' contains the value of measured temperature
hudakz 7:8beaacebc82d 29 pc.printf("temp = %3.1f%cC\r\n", temp, 176);
hudakz 7:8beaacebc82d 30 break;
hudakz 7:8beaacebc82d 31
hudakz 10:739d1a7a4b1b 32 case 1: // no sensor present -> 'temp' was not updated
hudakz 7:8beaacebc82d 33 pc.printf("no sensor present\n\r");
hudakz 7:8beaacebc82d 34 break;
hudakz 7:8beaacebc82d 35
hudakz 10:739d1a7a4b1b 36 case 2: // CRC error -> 'temp' was not updated
hudakz 7:8beaacebc82d 37 pc.printf("CRC error\r\n");
hudakz 7:8beaacebc82d 38 }
hudakz 7:8beaacebc82d 39
hudakz 4:d263a2860484 40 led = !led;
hudakz 0:77a366f9ba45 41 }
hudakz 7:8beaacebc82d 42 }
hudakz 7:8beaacebc82d 43 else
hudakz 4:d263a2860484 44 pc.printf("No DS1820 sensor found!\r\n");
hudakz 0:77a366f9ba45 45 }
hudakz 9:1d1c57840c7e 46 */
hudakz 1:fe12bf2ad337 47
hudakz 9:1d1c57840c7e 48
hudakz 10:739d1a7a4b1b 49 /*Several DS1820 sensors connected to the 1-wire bus:*/
hudakz 9:1d1c57840c7e 50 #include "mbed.h"
hudakz 9:1d1c57840c7e 51 #include "DS1820.h"
hudakz 9:1d1c57840c7e 52
hudakz 10:739d1a7a4b1b 53 #define MAX_SENSOSRS 32 // max number of DS1820 sensors to be connected to the 1-wire bus (max 256)
hudakz 9:1d1c57840c7e 54
hudakz 10:739d1a7a4b1b 55 DS1820* ds1820[MAX_SENSOSRS];
hudakz 9:1d1c57840c7e 56 Serial pc(USBTX, USBRX);
hudakz 9:1d1c57840c7e 57 DigitalOut led(LED1);
hudakz 10:739d1a7a4b1b 58 OneWire oneWire(D8); // substitute D8 with the actual pin name connected to the 1-wire bus
hudakz 10:739d1a7a4b1b 59 int sensorsFound = 0; // counts the actually found DS1820 sensors
hudakz 9:1d1c57840c7e 60
hudakz 10:739d1a7a4b1b 61 int main()
hudakz 10:739d1a7a4b1b 62 {
hudakz 10:739d1a7a4b1b 63 pc.printf("\r\n--Starting--\r\n");
hudakz 9:1d1c57840c7e 64
hudakz 9:1d1c57840c7e 65 //Enumerate (i.e. detect) DS1820 sensors on the 1-wire bus
hudakz 10:739d1a7a4b1b 66 for (sensorsFound = 0; sensorsFound < MAX_SENSOSRS; sensorsFound++) {
hudakz 10:739d1a7a4b1b 67 ds1820[sensorsFound] = new DS1820(&oneWire);
hudakz 10:739d1a7a4b1b 68 if (!ds1820[sensorsFound]->begin()) {
hudakz 10:739d1a7a4b1b 69 delete ds1820[sensorsFound];
hudakz 9:1d1c57840c7e 70 break;
hudakz 9:1d1c57840c7e 71 }
hudakz 9:1d1c57840c7e 72 }
hudakz 10:739d1a7a4b1b 73
hudakz 10:739d1a7a4b1b 74 switch (sensorsFound) {
hudakz 10:739d1a7a4b1b 75 case 0:
hudakz 10:739d1a7a4b1b 76 pc.printf("No DS1820 sensor found!\r\n");
hudakz 10:739d1a7a4b1b 77 return -1;
hudakz 10:739d1a7a4b1b 78
hudakz 10:739d1a7a4b1b 79 case 1:
hudakz 10:739d1a7a4b1b 80 pc.printf("One DS1820 sensor found.\r\n");
hudakz 10:739d1a7a4b1b 81 break;
hudakz 10:739d1a7a4b1b 82
hudakz 10:739d1a7a4b1b 83 default:
hudakz 10:739d1a7a4b1b 84 pc.printf("Found %d DS1820 sensors.\r\n", sensorsFound);
hudakz 9:1d1c57840c7e 85 }
hudakz 10:739d1a7a4b1b 86
hudakz 10:739d1a7a4b1b 87 while (1) {
hudakz 10:739d1a7a4b1b 88 pc.printf("----------------\r\n");
hudakz 10:739d1a7a4b1b 89 for (int i = 0; i < sensorsFound; i++)
hudakz 10:739d1a7a4b1b 90 ds1820[i]->startConversion(); // start temperature conversion from analog to digital
hudakz 12:34123e51ac35 91 ThisThread::sleep_for(1000); // let DS1820 sensors complete the temperature conversion
hudakz 10:739d1a7a4b1b 92 for (int i = 0; i < sensorsFound; i++) {
hudakz 10:739d1a7a4b1b 93 if (ds1820[i]->isPresent())
hudakz 10:739d1a7a4b1b 94 pc.printf("temp[%d] = %3.1f%cC\r\n", i, ds1820[i]->read(), 176); // read temperature
hudakz 9:1d1c57840c7e 95 }
hudakz 9:1d1c57840c7e 96 }
hudakz 9:1d1c57840c7e 97 }