ARM®mbed OS入门开发 DS18B20测温实验

anywill · 发表于 2016-10-21 11:03:24

/**

NUCLEO-F070R + DS18B20

Date:    Oct.2016
Version:  1.0
Name:    NUCLEO-F070R-DS1820
NOTE:    For more info see here: http://www.emcu.it/NUCLEOevaBoards/mBed/QSG-Mbed-Library.pdf
      原程序带NTC测温,本人将已其删除

UART
Baud Rate: 9600
Data Bit:    8
Parity:    NONE
Stop Bit:    1
Flow Control: NONE

Connect to the NUCLEO-F070R8 the DS18B20 sensor (see the schematic below).
The temperature sampling time is 1 sec.

DS18B20 front view
__________
|       |
| DS |
| 18B20  |
|       |
|__________|
   | | |
   1 2 3
GND  DQ VCC (3V3)
   | | |______________ to VCC (3.3V on the NUCLEO-F070R)
   | |  _|_
   | |  | |
   | |  | | 4K7
   | |  | |
   | |  -|-
   | |___|______________ to A1 (on the NUCLEO-F070RE)
   |
   |
   |______________________ to GND (on the NUCLEO-F070RE)

This SW is just for only one DS18B20
This SW is a derivative of:: http://developer.mbed.org/users/Sissors/code/DS1820_HelloWorld/
On the: http://developer.mbed.org/users/Sissors/code/DS1820_HelloWorld/ there is a multi sensor (DS18B20) example.

*/

#define MULTIPLE_PROBES
#define DATA_PIN       A1

#ifdef MULTIPLE_PROBES

#include "mbed.h"
#include "DS1820.h"

#define MAX_PROBES    16

float get_temperature(void);

float temp=0;
float tempArr[100];
int n=0;//n个测温设备
Serial pc(SERIAL_TX, SERIAL_RX); // 虚拟 USART2 tx, rx
DS1820* probe[MAX_PROBES];

int main()
{
// Initialize the probe array to DS1820 objects
int num_devices = 0;
while(DS1820::unassignedProbe(DATA_PIN)) //检测测温设备
{
      probe[num_devices] = new DS1820(DATA_PIN);
      num_devices++;
      if (num_devices == MAX_PROBES)
         break;
}

printf("Found %d device(s)\r\n\n", num_devices);//检测到n个测温设备

while(1)
{
      probe[0]->convertTemperature(true, DS1820::all_devices);       //Start temperature conversion, wait until ready
      for (int i = 0; i<num_devices; i++)
         printf("Device %d returns %3.3f oC\r\n", i, probe->temperature());

      wait(1);
}

}

#else
#include "mbed.h"
#include "DS1820.h"

DS1820 probe(DATA_PIN);

int main() {
while(1) {
      probe.convertTemperature(true, DS1820::all_devices);       //Start temperature conversion, wait until ready
      printf("It is %3.3f oC\r\n", probe.temperature());
      wait(1);
}
}

#endif