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Coffeemaker controller
Diff: DS1820.h
- Revision:
- 0:17c5e4f9a805
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/DS1820.h Sat Sep 26 00:30:09 2020 +0000 @@ -0,0 +1,131 @@ +#ifndef DS1820_H_ + #define DS1820_H_ + + #include <OneWire.h> + +/** + * Dallas' DS1820 family temperature sensor. + * This library depends on the OneWire library (Dallas' 1-Wire bus protocol implementation) + * available at <http://developer.mbed.org/users/hudakz/code/OneWire/> + * + * Example of use: + * + * @code + * + * Single sensor. + * + * #include "mbed.h" + * #include "DS1820.h" + * + * Serial pc(USBTX, USBRX); + * DigitalOut led(LED1); + * DS1820 ds1820(D8); // substitute D8 with actual mbed pin name connected to 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"); + * } + * + * + * More 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 to the DS1820 data pin + * 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 + * } + * } + * } + * + * @endcode + * + * Note: Don't forget to connect a 4.7k Ohm resistor + * between the DS1820's data pin and the +3.3V pin + * + */ +class DS1820 +{ + OneWire *oneWire; + bool present; + bool model_s; + uint8_t data[12]; + uint8_t addr[8]; + float toFloat(uint16_t word); + static uint8_t lastAddr[8]; + +public: + DS1820(PinName pin); +// DS1820(char model, PinName pin); + DS1820(OneWire* wire); + bool begin(void); + bool isPresent(); + void setResolution(uint8_t res); + void startConversion(void); + float read(void); + uint8_t read(float& temp); +}; +#endif /* DS1820_H_ */