GSOE Belueftung DS18B20
Dependencies: LCD_i2c_GSOE DS1820
main.cpp
- Committer:
- hudakz
- Date:
- 2019-03-10
- Revision:
- 9:1d1c57840c7e
- Parent:
- 7:8beaacebc82d
- Child:
- 10:739d1a7a4b1b
File content as of revision 9:1d1c57840c7e:
/* * Simple DS1820 sensor demo * * Note: Don't forget to connect a 4.7k Ohm resistor * between the DS1820's data pin and the +3.3V pin * */ /* Single sensor: */ /* #include "mbed.h" #include "DS1820.h" Serial pc(USBTX, USBRX); DigitalOut led(LED1); OneWire oneWire(D8); // substitute D8 with actual mbed pin name connected 1-wire bus float temp = 0; int result = 0; int main() { pc.printf("\r\n--Starting--\r\n"); if (ds1820.begin()) { while (1) { ds1820.startConversion(); // start temperature conversion from analog to digital wait(1.0); // let DS1820 complete the temperature conversion result = ds1820.read(temp); // read temperature from DS1820 and perform cyclic redundancy check (CRC) switch (result) { case 0: // no errors -> 'temp' contains the value of measured temperature pc.printf("temp = %3.1f%cC\r\n", temp, 176); break; case 1: // no sensor present -> 'temp' is not updated pc.printf("no sensor present\n\r"); break; case 2: // CRC error -> 'temp' is not updated pc.printf("CRC error\r\n"); } led = !led; } } else pc.printf("No DS1820 sensor found!\r\n"); } */ /*Several sensors connected to the same 1-wire bus:*/ #include "mbed.h" #include "DS1820.h" #define SENSORS_COUNT 64 // number of DS1820 sensors to be connected to the 1-wire bus (max 256) Serial pc(USBTX, USBRX); DigitalOut led(LED1); OneWire oneWire(D8); // substitute D8 with actual mbed pin name connected 1-wire bus DS1820* ds1820[SENSORS_COUNT]; int sensors_found = 0; // counts the actually found DS1820 sensors float temp = 0; int result = 0; int main() { int i = 0; pc.printf("\r\n--Starting--\r\n"); //Enumerate (i.e. detect) DS1820 sensors on the 1-wire bus for(i = 0; i < SENSORS_COUNT; i++) { ds1820[i] = new DS1820(&oneWire); if(!ds1820[i]->begin()) { delete ds1820[i]; break; } } sensors_found = i; if (sensors_found == 0) { pc.printf("No DS1820 sensor found!\r\n"); return -1; } else pc.printf("Found %d sensors.\r\n", sensors_found); while(1) { pc.printf("-------------------\r\n"); for(i = 0; i < sensors_found; i++) ds1820[i]->startConversion(); // start temperature conversion from analog to digital wait(1.0); // let DS1820s complete the temperature conversion for(int i = 0; i < sensors_found; i++) { if(ds1820[i]->isPresent()) pc.printf("temp[%d] = %3.1f%cC\r\n", i, ds1820[i]->read(), 176); // read temperature } } }