// // FILE: dht.h // AUTHOR: Rob Tillaart // VERSION: 0.1.13 // PURPOSE: DHT Temperature & Humidity Sensor library for Arduino // URL: http://arduino.cc/playground/Main/DHTLib // // HISTORY: // see dht.cpp file // #ifndef dht_h #define dht_h #if ARDUINO < 100 #include #else #include #endif #define DHT_LIB_VERSION "0.1.13" #define DHTLIB_OK 0 #define DHTLIB_ERROR_CHECKSUM -1 #define DHTLIB_ERROR_TIMEOUT -2 #define DHTLIB_INVALID_VALUE -999 #define DHTLIB_DHT11_WAKEUP 18 #define DHTLIB_DHT_WAKEUP 1 // max timeout is 100usec. // For a 16Mhz proc that is max 1600 clock cycles // loops using TIMEOUT use at least 4 clock cycli // so 100 us takes max 400 loops // so by dividing F_CPU by 40000 we "fail" as fast as possible #define DHTLIB_TIMEOUT (F_CPU/40000) class dht { public: // return values: // DHTLIB_OK // DHTLIB_ERROR_CHECKSUM // DHTLIB_ERROR_TIMEOUT int read11(uint8_t pin); int read(uint8_t pin); inline int read21(uint8_t pin) { return read(pin); }; inline int read22(uint8_t pin) { return read(pin); }; inline int read33(uint8_t pin) { return read(pin); }; inline int read44(uint8_t pin) { return read(pin); }; double humidity; double temperature; private: uint8_t bits[5]; // buffer to receive data int _readSensor(uint8_t pin, uint8_t wakeupDelay); }; #endif // // END OF FILE //