add Dewpoint
Fork of AM2321 by
AM2321.h@0:d1c0dbf5e5a6, 2014-05-06 (annotated)
- Committer:
- tomozh
- Date:
- Tue May 06 10:21:11 2014 +0000
- Revision:
- 0:d1c0dbf5e5a6
- Child:
- 1:f42b99c425e8
1st release
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
tomozh | 0:d1c0dbf5e5a6 | 1 | /** |
tomozh | 0:d1c0dbf5e5a6 | 2 | * AM2321 (Aosong Guangzhou Electronics) |
tomozh | 0:d1c0dbf5e5a6 | 3 | * Temperature and Humidity Sensor mbed library |
tomozh | 0:d1c0dbf5e5a6 | 4 | * Last update : 2014/05/06 |
tomozh | 0:d1c0dbf5e5a6 | 5 | */ |
tomozh | 0:d1c0dbf5e5a6 | 6 | |
tomozh | 0:d1c0dbf5e5a6 | 7 | #ifndef __AM2321_H__ |
tomozh | 0:d1c0dbf5e5a6 | 8 | #define __AM2321_H__ |
tomozh | 0:d1c0dbf5e5a6 | 9 | |
tomozh | 0:d1c0dbf5e5a6 | 10 | /** AM2321 (Aosong Guangzhou Electronics) |
tomozh | 0:d1c0dbf5e5a6 | 11 | * Temperature and Humidity Sensor mbed library |
tomozh | 0:d1c0dbf5e5a6 | 12 | * |
tomozh | 0:d1c0dbf5e5a6 | 13 | * Example: |
tomozh | 0:d1c0dbf5e5a6 | 14 | * @code |
tomozh | 0:d1c0dbf5e5a6 | 15 | * #include "mbed.h" |
tomozh | 0:d1c0dbf5e5a6 | 16 | * #include "AM2321.h" |
tomozh | 0:d1c0dbf5e5a6 | 17 | * |
tomozh | 0:d1c0dbf5e5a6 | 18 | * Serial pc(USBTX, USBRX); // Tx, Rx |
tomozh | 0:d1c0dbf5e5a6 | 19 | * AM2321 am2321(p28, p27); // SDA, SCL |
tomozh | 0:d1c0dbf5e5a6 | 20 | * |
tomozh | 0:d1c0dbf5e5a6 | 21 | * int main() |
tomozh | 0:d1c0dbf5e5a6 | 22 | * { |
tomozh | 0:d1c0dbf5e5a6 | 23 | * while(1) |
tomozh | 0:d1c0dbf5e5a6 | 24 | * { |
tomozh | 0:d1c0dbf5e5a6 | 25 | * if(am2321.poll()) |
tomozh | 0:d1c0dbf5e5a6 | 26 | * { |
tomozh | 0:d1c0dbf5e5a6 | 27 | * pc.printf(":%05u,%.1f,%.1f\n" |
tomozh | 0:d1c0dbf5e5a6 | 28 | * , count++ |
tomozh | 0:d1c0dbf5e5a6 | 29 | * , am2321.getTemperature() |
tomozh | 0:d1c0dbf5e5a6 | 30 | * , am2321.getHumidity() |
tomozh | 0:d1c0dbf5e5a6 | 31 | * ); |
tomozh | 0:d1c0dbf5e5a6 | 32 | * } |
tomozh | 0:d1c0dbf5e5a6 | 33 | * |
tomozh | 0:d1c0dbf5e5a6 | 34 | * wait(0.5); |
tomozh | 0:d1c0dbf5e5a6 | 35 | * } |
tomozh | 0:d1c0dbf5e5a6 | 36 | * } |
tomozh | 0:d1c0dbf5e5a6 | 37 | * @endcode |
tomozh | 0:d1c0dbf5e5a6 | 38 | */ |
tomozh | 0:d1c0dbf5e5a6 | 39 | class AM2321 |
tomozh | 0:d1c0dbf5e5a6 | 40 | { |
tomozh | 0:d1c0dbf5e5a6 | 41 | private: |
tomozh | 0:d1c0dbf5e5a6 | 42 | typedef struct tagRESULT |
tomozh | 0:d1c0dbf5e5a6 | 43 | { |
tomozh | 0:d1c0dbf5e5a6 | 44 | float temperature; |
tomozh | 0:d1c0dbf5e5a6 | 45 | float humidity; |
tomozh | 0:d1c0dbf5e5a6 | 46 | }RESULT; |
tomozh | 0:d1c0dbf5e5a6 | 47 | |
tomozh | 0:d1c0dbf5e5a6 | 48 | public: |
tomozh | 0:d1c0dbf5e5a6 | 49 | /** Constructor |
tomozh | 0:d1c0dbf5e5a6 | 50 | * @param sda [in] I2C Pin name (SDA) |
tomozh | 0:d1c0dbf5e5a6 | 51 | * @param scl [in] I2C Pin name (SCL) |
tomozh | 0:d1c0dbf5e5a6 | 52 | */ |
tomozh | 0:d1c0dbf5e5a6 | 53 | AM2321(PinName sda, PinName scl); |
tomozh | 0:d1c0dbf5e5a6 | 54 | |
tomozh | 0:d1c0dbf5e5a6 | 55 | /** Read current temperature and humidity from AM2321 |
tomozh | 0:d1c0dbf5e5a6 | 56 | * @return result (true=success) |
tomozh | 0:d1c0dbf5e5a6 | 57 | */ |
tomozh | 0:d1c0dbf5e5a6 | 58 | bool poll(); |
tomozh | 0:d1c0dbf5e5a6 | 59 | |
tomozh | 0:d1c0dbf5e5a6 | 60 | /** Get last read temperature value |
tomozh | 0:d1c0dbf5e5a6 | 61 | * @return temperature value (degress) |
tomozh | 0:d1c0dbf5e5a6 | 62 | */ |
tomozh | 0:d1c0dbf5e5a6 | 63 | float getTemperature(void) const; |
tomozh | 0:d1c0dbf5e5a6 | 64 | |
tomozh | 0:d1c0dbf5e5a6 | 65 | /** Get last read humidity value |
tomozh | 0:d1c0dbf5e5a6 | 66 | * @return humidity value (%RH) |
tomozh | 0:d1c0dbf5e5a6 | 67 | */ |
tomozh | 0:d1c0dbf5e5a6 | 68 | float getHumidity(void) const; |
tomozh | 0:d1c0dbf5e5a6 | 69 | |
tomozh | 0:d1c0dbf5e5a6 | 70 | private: |
tomozh | 0:d1c0dbf5e5a6 | 71 | float getLogicalValue(uint16_t regVal) const; |
tomozh | 0:d1c0dbf5e5a6 | 72 | uint16_t calcCRC16(const uint8_t* src, int len) const; |
tomozh | 0:d1c0dbf5e5a6 | 73 | |
tomozh | 0:d1c0dbf5e5a6 | 74 | I2C _i2c; |
tomozh | 0:d1c0dbf5e5a6 | 75 | RESULT _result; |
tomozh | 0:d1c0dbf5e5a6 | 76 | }; |
tomozh | 0:d1c0dbf5e5a6 | 77 | |
tomozh | 0:d1c0dbf5e5a6 | 78 | |
tomozh | 0:d1c0dbf5e5a6 | 79 | #endif // __AM2321_H__ |