javier vicente
/
MASTER_ONEWIRE_DS1820
ds18b20 work for ST Nucleo
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?
User | Revision | Line number | New 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 |