Roman Rachkov / Mbed OS ds

DS1820

Dependencies:   BufferedSerial DS1820

main.cpp@0:08aac9dc9662, 2020-09-21 (annotated)

Committer:
romanbg
Date:
Mon Sep 21 23:11:07 2020 +0000
Revision:
0:08aac9dc9662
DS1820

Who changed what in which revision?

UserRevisionLine numberNew contents of line
romanbg 0:08aac9dc9662 1 /*
romanbg 0:08aac9dc9662 2 * DS1820 sensor demo
romanbg 0:08aac9dc9662 3 *
romanbg 0:08aac9dc9662 4 * Note: Don't forget to connect a 4.7k Ohm resistor
romanbg 0:08aac9dc9662 5 * between the DS1820's data pin and the +3.3V pin
romanbg 0:08aac9dc9662 6 *
romanbg 0:08aac9dc9662 7 */
romanbg 0:08aac9dc9662 8 #include "mbed.h"
romanbg 0:08aac9dc9662 9 #include "BufferedSerial.h"
romanbg 0:08aac9dc9662 10 #include "DS1820.h"
romanbg 0:08aac9dc9662 11
romanbg 0:08aac9dc9662 12
romanbg 0:08aac9dc9662 13 BufferedSerial pc(PA_9, PA_10);
romanbg 0:08aac9dc9662 14
romanbg 0:08aac9dc9662 15
romanbg 0:08aac9dc9662 16 DigitalOut led(PC_13);
romanbg 0:08aac9dc9662 17 DS1820 ds1820(PA_6); // substitute PA_9 with actual mbed pin name connected to the DS1820 data pin
romanbg 0:08aac9dc9662 18 float temp = 0;
romanbg 0:08aac9dc9662 19
romanbg 0:08aac9dc9662 20 int main()
romanbg 0:08aac9dc9662 21 {
romanbg 0:08aac9dc9662 22 int error = 0;
romanbg 0:08aac9dc9662 23
romanbg 0:08aac9dc9662 24 if(ds1820.begin()) {
romanbg 0:08aac9dc9662 25 while(1) {
romanbg 0:08aac9dc9662 26 ds1820.startConversion(); // start temperature conversion from analog to digital
romanbg 0:08aac9dc9662 27 ThisThread::sleep_for(1000); // let DS1820 complete the temperature conversion
romanbg 0:08aac9dc9662 28 error = ds1820.read(temp); // read temperature from DS1820 and perform cyclic redundancy check (CRC)
romanbg 0:08aac9dc9662 29 switch(error) {
romanbg 0:08aac9dc9662 30 case 0: // no errors -> 'temp' contains the value of measured temperature
romanbg 0:08aac9dc9662 31 pc.printf("temp = %3.1f%cC\r\n", temp, 176);
romanbg 0:08aac9dc9662 32 break;
romanbg 0:08aac9dc9662 33 case 1: // no sensor present -> 'temp' is not updated
romanbg 0:08aac9dc9662 34 pc.printf("no sensor present\n\r");
romanbg 0:08aac9dc9662 35 break;
romanbg 0:08aac9dc9662 36 case 2: // CRC error -> 'temp' is not updated
romanbg 0:08aac9dc9662 37 pc.printf("CRC error\r\n");
romanbg 0:08aac9dc9662 38 }
romanbg 0:08aac9dc9662 39 led = !led;
romanbg 0:08aac9dc9662 40 }
romanbg 0:08aac9dc9662 41 } else
romanbg 0:08aac9dc9662 42 printf("No DS1820 sensor found!\r\n");
romanbg 0:08aac9dc9662 43 }