77 lines
1.7 KiB
C
77 lines
1.7 KiB
C
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#ifndef _DHT22_H_
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#define _DHT22_H_
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#include <inttypes.h>
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#define DHT22_ERROR_VALUE -995
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typedef enum
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{
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DHT_ERROR_NONE = 0,
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DHT_BUS_HUNG,
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DHT_ERROR_NOT_PRESENT,
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DHT_ERROR_ACK_TOO_LONG,
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DHT_ERROR_SYNC_TIMEOUT,
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DHT_ERROR_DATA_TIMEOUT,
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DHT_ERROR_CHECKSUM,
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DHT_ERROR_TOOQUICK
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} DHT22_ERROR_t;
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class DHT22
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{
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private:
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uint8_t _bitmask;
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volatile uint8_t *_baseReg;
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unsigned long _lastReadTime;
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short int _lastHumidity;
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short int _lastTemperature;
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public:
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DHT22(uint8_t pin);
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DHT22_ERROR_t readData();
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short int getHumidityInt();
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short int getTemperatureCInt();
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void clockReset();
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#if !defined(DHT22_NO_FLOAT)
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float getHumidity();
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float getTemperatureC();
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#endif
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};
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// Report the humidity in .1 percent increments, such that 635 means 63.5% relative humidity
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//
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// Converts from the internal integer format on demand, so you might want
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// to cache the result.
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inline short int DHT22::getHumidityInt()
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{
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return _lastHumidity;
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}
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// Get the temperature in decidegrees C, such that 326 means 32.6 degrees C.
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// The temperature may be negative, so be careful when handling the fractional part.
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inline short int DHT22::getTemperatureCInt()
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{
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return _lastTemperature;
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}
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#if !defined(DHT22_NO_FLOAT)
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// Return the percentage relative humidity in decimal form
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inline float DHT22::getHumidity()
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{
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return float(_lastHumidity)/10;
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}
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#endif
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#if !defined(DHT22_NO_FLOAT)
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// Return the percentage relative humidity in decimal form
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//
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// Converts from the internal integer format on demand, so you might want
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// to cache the result.
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inline float DHT22::getTemperatureC()
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{
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return float(_lastTemperature)/10;
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}
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#endif //DHT22_SUPPORT_FLOAT
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#endif /*_DHT22_H_*/
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