GSOE Belueftung DS18B20
Dependencies: LCD_i2c_GSOE DS1820
Revision 10:739d1a7a4b1b, committed 2019-03-10
- Comitter:
- hudakz
- Date:
- Sun Mar 10 20:59:00 2019 +0000
- Parent:
- 9:1d1c57840c7e
- Child:
- 11:1be668e096a2
- Commit message:
- Updated.
Changed in this revision
main.cpp | Show annotated file Show diff for this revision Revisions of this file |
--- a/main.cpp Sun Mar 10 13:20:39 2019 +0000 +++ b/main.cpp Sun Mar 10 20:59:00 2019 +0000 @@ -1,24 +1,24 @@ /* - * Simple DS1820 sensor demo + * Simple example program * * Note: Don't forget to connect a 4.7k Ohm resistor * between the DS1820's data pin and the +3.3V pin * */ -/* Single sensor: */ + +/* Single DS1820 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 +DS1820 ds1820(D8); // substitute D8 with the actual pin name connected to the DS1820 sensor 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 @@ -29,11 +29,11 @@ pc.printf("temp = %3.1f%cC\r\n", temp, 176); break; - case 1: // no sensor present -> 'temp' is not updated + case 1: // no sensor present -> 'temp' was not updated pc.printf("no sensor present\n\r"); break; - case 2: // CRC error -> 'temp' is not updated + case 2: // CRC error -> 'temp' was not updated pc.printf("CRC error\r\n"); } @@ -45,52 +45,53 @@ } */ -/*Several sensors connected to the same 1-wire bus:*/ +/*Several DS1820 sensors connected to the 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) +#define MAX_SENSOSRS 32 // max number of DS1820 sensors to be connected to the 1-wire bus (max 256) +DS1820* ds1820[MAX_SENSOSRS]; 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; +OneWire oneWire(D8); // substitute D8 with the actual pin name connected to the 1-wire bus +int sensorsFound = 0; // counts the actually found DS1820 sensors -int main() { - int i = 0; +int main() +{ + pc.printf("\r\n--Starting--\r\n"); - 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]; + for (sensorsFound = 0; sensorsFound < MAX_SENSOSRS; sensorsFound++) { + ds1820[sensorsFound] = new DS1820(&oneWire); + if (!ds1820[sensorsFound]->begin()) { + delete ds1820[sensorsFound]; break; } } - - sensors_found = i; - - if (sensors_found == 0) { - pc.printf("No DS1820 sensor found!\r\n"); - return -1; + + switch (sensorsFound) { + case 0: + pc.printf("No DS1820 sensor found!\r\n"); + return -1; + + case 1: + pc.printf("One DS1820 sensor found.\r\n"); + break; + + default: + pc.printf("Found %d DS1820 sensors.\r\n", sensorsFound); } - 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 + + while (1) { + pc.printf("----------------\r\n"); + for (int i = 0; i < sensorsFound; i++) + ds1820[i]->startConversion(); // start temperature conversion from analog to digital + wait(1.0); // let DS1820 sensors complete the temperature conversion + for (int i = 0; i < sensorsFound; i++) { + if (ds1820[i]->isPresent()) + pc.printf("temp[%d] = %3.1f%cC\r\n", i, ds1820[i]->read(), 176); // read temperature } } } -