javier vicente
/
MASTER_ONEWIRE_DS1820
ds18b20 work for ST Nucleo
main.cpp
- Committer:
- javiervicente
- Date:
- 2020-12-11
- Revision:
- 3:5055285819f7
- Parent:
- 2:ffa66d4cd7cf
File content as of revision 3:5055285819f7:
/* * 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 * */ #include "mbed.h" #include "DS1820.h" Serial pc(SERIAL_TX, SERIAL_RX); DigitalOut led(LED1); DS1820 ds1820(D2); // substitute PA_9 with actual mbed pin name connected to the DS1820 data pin float temp = 0; int main() { int error = 0; pc.baud(115200); if(ds1820.begin()) { while(1) { ds1820.startConversion(); // start temperature conversion from analog to digital wait(1.0); // let DS1820 complete the temperature conversion error = ds1820.read(temp); // read temperature from DS1820 and perform cyclic redundancy check (CRC) switch(error) { case 0: // no errors -> 'temp' contains the value of measured temperature pc.printf("temp = %3.1f C\r\n", temp); 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"); }