javier vicente / Mbed 2 deprecated MASTER_ONEWIRE_DS1820

ds18b20 work for ST Nucleo

Dependencies:   mbed DS1820

main.cpp@3:5055285819f7, 2020-12-11 (annotated)

Committer:
javiervicente
Date:
Fri Dec 11 12:14:31 2020 +0000
Revision:
3:5055285819f7
Parent:
2:ffa66d4cd7cf 
bueno

Who changed what in which revision?

UserRevisionLine numberNew contents of line
javiervicente 2:ffa66d4cd7cf 1 /*
javiervicente 2:ffa66d4cd7cf 2 * DS1820 sensor demo
javiervicente 2:ffa66d4cd7cf 3 *
javiervicente 2:ffa66d4cd7cf 4 * Note: Don't forget to connect a 4.7k Ohm resistor
javiervicente 2:ffa66d4cd7cf 5 * between the DS1820's data pin and the +3.3V pin
javiervicente 2:ffa66d4cd7cf 6 *
javiervicente 2:ffa66d4cd7cf 7 */
TuanPM 0:6cb99f312e0e 8 #include "mbed.h"
TuanPM 0:6cb99f312e0e 9 #include "DS1820.h"
javiervicente 2:ffa66d4cd7cf 10
TuanPM 0:6cb99f312e0e 11 Serial pc(SERIAL_TX, SERIAL_RX);
javiervicente 2:ffa66d4cd7cf 12 DigitalOut led(LED1);
javiervicente 2:ffa66d4cd7cf 13 DS1820 ds1820(D2); // substitute PA_9 with actual mbed pin name connected to the DS1820 data pin
javiervicente 2:ffa66d4cd7cf 14 float temp = 0;
TuanPM 0:6cb99f312e0e 15
javiervicente 2:ffa66d4cd7cf 16 int main()
javiervicente 2:ffa66d4cd7cf 17 {
javiervicente 2:ffa66d4cd7cf 18 int error = 0;
javiervicente 3:5055285819f7 19 pc.baud(115200);
TuanPM 0:6cb99f312e0e 20
javiervicente 2:ffa66d4cd7cf 21 if(ds1820.begin()) {
javiervicente 2:ffa66d4cd7cf 22 while(1) {
javiervicente 2:ffa66d4cd7cf 23 ds1820.startConversion(); // start temperature conversion from analog to digital
javiervicente 2:ffa66d4cd7cf 24 wait(1.0); // let DS1820 complete the temperature conversion
javiervicente 2:ffa66d4cd7cf 25 error = ds1820.read(temp); // read temperature from DS1820 and perform cyclic redundancy check (CRC)
javiervicente 2:ffa66d4cd7cf 26 switch(error) {
javiervicente 2:ffa66d4cd7cf 27 case 0: // no errors -> 'temp' contains the value of measured temperature
javiervicente 2:ffa66d4cd7cf 28 pc.printf("temp = %3.1f C\r\n", temp);
javiervicente 2:ffa66d4cd7cf 29 break;
javiervicente 2:ffa66d4cd7cf 30 case 1: // no sensor present -> 'temp' is not updated
javiervicente 2:ffa66d4cd7cf 31 pc.printf("no sensor present\n\r");
javiervicente 2:ffa66d4cd7cf 32 break;
javiervicente 2:ffa66d4cd7cf 33 case 2: // CRC error -> 'temp' is not updated
javiervicente 2:ffa66d4cd7cf 34 pc.printf("CRC error\r\n");
javiervicente 2:ffa66d4cd7cf 35 }
javiervicente 2:ffa66d4cd7cf 36 led = !led;
TuanPM 0:6cb99f312e0e 37 }
javiervicente 2:ffa66d4cd7cf 38 } else
javiervicente 2:ffa66d4cd7cf 39 pc.printf("No DS1820 sensor found!\r\n");
TuanPM 0:6cb99f312e0e 40 }
javiervicente 2:ffa66d4cd7cf 41