Juan Manuel Rodriguez Aguado
/
Ejer01
SensorCooler
main.cpp@9:1d1c57840c7e, 2019-03-10 (annotated)
- Committer:
- hudakz
- Date:
- Sun Mar 10 13:20:39 2019 +0000
- Revision:
- 9:1d1c57840c7e
- Parent:
- 7:8beaacebc82d
- Child:
- 10:739d1a7a4b1b
Several DS1820 sensors connected to the same 1-wire bus.
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
hudakz | 0:77a366f9ba45 | 1 | /* |
hudakz | 0:77a366f9ba45 | 2 | * Simple DS1820 sensor demo |
hudakz | 1:fe12bf2ad337 | 3 | * |
hudakz | 1:fe12bf2ad337 | 4 | * Note: Don't forget to connect a 4.7k Ohm resistor |
hudakz | 1:fe12bf2ad337 | 5 | * between the DS1820's data pin and the +3.3V pin |
hudakz | 1:fe12bf2ad337 | 6 | * |
hudakz | 0:77a366f9ba45 | 7 | */ |
hudakz | 9:1d1c57840c7e | 8 | /* Single sensor: */ |
hudakz | 9:1d1c57840c7e | 9 | /* |
hudakz | 0:77a366f9ba45 | 10 | #include "mbed.h" |
hudakz | 0:77a366f9ba45 | 11 | #include "DS1820.h" |
hudakz | 0:77a366f9ba45 | 12 | |
hudakz | 4:d263a2860484 | 13 | Serial pc(USBTX, USBRX); |
hudakz | 4:d263a2860484 | 14 | DigitalOut led(LED1); |
hudakz | 9:1d1c57840c7e | 15 | OneWire oneWire(D8); // substitute D8 with actual mbed pin name connected 1-wire bus |
hudakz | 4:d263a2860484 | 16 | float temp = 0; |
hudakz | 7:8beaacebc82d | 17 | int result = 0; |
hudakz | 7:8beaacebc82d | 18 | |
hudakz | 7:8beaacebc82d | 19 | int main() |
hudakz | 7:8beaacebc82d | 20 | { |
hudakz | 9:1d1c57840c7e | 21 | pc.printf("\r\n--Starting--\r\n"); |
hudakz | 7:8beaacebc82d | 22 | if (ds1820.begin()) { |
hudakz | 7:8beaacebc82d | 23 | while (1) { |
hudakz | 7:8beaacebc82d | 24 | ds1820.startConversion(); // start temperature conversion from analog to digital |
hudakz | 7:8beaacebc82d | 25 | wait(1.0); // let DS1820 complete the temperature conversion |
hudakz | 4:d263a2860484 | 26 | result = ds1820.read(temp); // read temperature from DS1820 and perform cyclic redundancy check (CRC) |
hudakz | 7:8beaacebc82d | 27 | switch (result) { |
hudakz | 7:8beaacebc82d | 28 | case 0: // no errors -> 'temp' contains the value of measured temperature |
hudakz | 7:8beaacebc82d | 29 | pc.printf("temp = %3.1f%cC\r\n", temp, 176); |
hudakz | 7:8beaacebc82d | 30 | break; |
hudakz | 7:8beaacebc82d | 31 | |
hudakz | 7:8beaacebc82d | 32 | case 1: // no sensor present -> 'temp' is not updated |
hudakz | 7:8beaacebc82d | 33 | pc.printf("no sensor present\n\r"); |
hudakz | 7:8beaacebc82d | 34 | break; |
hudakz | 7:8beaacebc82d | 35 | |
hudakz | 7:8beaacebc82d | 36 | case 2: // CRC error -> 'temp' is not updated |
hudakz | 7:8beaacebc82d | 37 | pc.printf("CRC error\r\n"); |
hudakz | 7:8beaacebc82d | 38 | } |
hudakz | 7:8beaacebc82d | 39 | |
hudakz | 4:d263a2860484 | 40 | led = !led; |
hudakz | 0:77a366f9ba45 | 41 | } |
hudakz | 7:8beaacebc82d | 42 | } |
hudakz | 7:8beaacebc82d | 43 | else |
hudakz | 4:d263a2860484 | 44 | pc.printf("No DS1820 sensor found!\r\n"); |
hudakz | 0:77a366f9ba45 | 45 | } |
hudakz | 9:1d1c57840c7e | 46 | */ |
hudakz | 1:fe12bf2ad337 | 47 | |
hudakz | 9:1d1c57840c7e | 48 | /*Several sensors connected to the same 1-wire bus:*/ |
hudakz | 9:1d1c57840c7e | 49 | |
hudakz | 9:1d1c57840c7e | 50 | #include "mbed.h" |
hudakz | 9:1d1c57840c7e | 51 | #include "DS1820.h" |
hudakz | 9:1d1c57840c7e | 52 | |
hudakz | 9:1d1c57840c7e | 53 | #define SENSORS_COUNT 64 // number of DS1820 sensors to be connected to the 1-wire bus (max 256) |
hudakz | 9:1d1c57840c7e | 54 | |
hudakz | 9:1d1c57840c7e | 55 | Serial pc(USBTX, USBRX); |
hudakz | 9:1d1c57840c7e | 56 | DigitalOut led(LED1); |
hudakz | 9:1d1c57840c7e | 57 | OneWire oneWire(D8); // substitute D8 with actual mbed pin name connected 1-wire bus |
hudakz | 9:1d1c57840c7e | 58 | DS1820* ds1820[SENSORS_COUNT]; |
hudakz | 9:1d1c57840c7e | 59 | int sensors_found = 0; // counts the actually found DS1820 sensors |
hudakz | 9:1d1c57840c7e | 60 | float temp = 0; |
hudakz | 9:1d1c57840c7e | 61 | int result = 0; |
hudakz | 9:1d1c57840c7e | 62 | |
hudakz | 9:1d1c57840c7e | 63 | int main() { |
hudakz | 9:1d1c57840c7e | 64 | int i = 0; |
hudakz | 9:1d1c57840c7e | 65 | |
hudakz | 9:1d1c57840c7e | 66 | pc.printf("\r\n--Starting--\r\n"); |
hudakz | 9:1d1c57840c7e | 67 | //Enumerate (i.e. detect) DS1820 sensors on the 1-wire bus |
hudakz | 9:1d1c57840c7e | 68 | for(i = 0; i < SENSORS_COUNT; i++) { |
hudakz | 9:1d1c57840c7e | 69 | ds1820[i] = new DS1820(&oneWire); |
hudakz | 9:1d1c57840c7e | 70 | if(!ds1820[i]->begin()) { |
hudakz | 9:1d1c57840c7e | 71 | delete ds1820[i]; |
hudakz | 9:1d1c57840c7e | 72 | break; |
hudakz | 9:1d1c57840c7e | 73 | } |
hudakz | 9:1d1c57840c7e | 74 | } |
hudakz | 9:1d1c57840c7e | 75 | |
hudakz | 9:1d1c57840c7e | 76 | sensors_found = i; |
hudakz | 9:1d1c57840c7e | 77 | |
hudakz | 9:1d1c57840c7e | 78 | if (sensors_found == 0) { |
hudakz | 9:1d1c57840c7e | 79 | pc.printf("No DS1820 sensor found!\r\n"); |
hudakz | 9:1d1c57840c7e | 80 | return -1; |
hudakz | 9:1d1c57840c7e | 81 | } |
hudakz | 9:1d1c57840c7e | 82 | else |
hudakz | 9:1d1c57840c7e | 83 | pc.printf("Found %d sensors.\r\n", sensors_found); |
hudakz | 9:1d1c57840c7e | 84 | |
hudakz | 9:1d1c57840c7e | 85 | while(1) { |
hudakz | 9:1d1c57840c7e | 86 | pc.printf("-------------------\r\n"); |
hudakz | 9:1d1c57840c7e | 87 | for(i = 0; i < sensors_found; i++) |
hudakz | 9:1d1c57840c7e | 88 | ds1820[i]->startConversion(); // start temperature conversion from analog to digital |
hudakz | 9:1d1c57840c7e | 89 | wait(1.0); // let DS1820s complete the temperature conversion |
hudakz | 9:1d1c57840c7e | 90 | for(int i = 0; i < sensors_found; i++) { |
hudakz | 9:1d1c57840c7e | 91 | if(ds1820[i]->isPresent()) |
hudakz | 9:1d1c57840c7e | 92 | pc.printf("temp[%d] = %3.1f%cC\r\n", i, ds1820[i]->read(), 176); // read temperature |
hudakz | 9:1d1c57840c7e | 93 | } |
hudakz | 9:1d1c57840c7e | 94 | } |
hudakz | 9:1d1c57840c7e | 95 | } |
hudakz | 9:1d1c57840c7e | 96 |