63 lines
1.4 KiB
C++
63 lines
1.4 KiB
C++
//
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// FILE: dht.h
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// AUTHOR: Rob Tillaart
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// VERSION: 0.2.1
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// PURPOSE: DHT Temperature & Humidity Sensor library for Arduino
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// URL: https://github.com/RobTillaart/Arduino/tree/master/libraries/DHTstable
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//
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// HISTORY:
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// see dht.cpp file
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//
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#ifndef dht_h
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#define dht_h
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#if ARDUINO < 100
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#include <WProgram.h>
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#else
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#include <Arduino.h>
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#endif
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#define DHT_LIB_VERSION "0.2.1 - dhtstable"
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#define DHTLIB_OK 0
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#define DHTLIB_ERROR_CHECKSUM -1
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#define DHTLIB_ERROR_TIMEOUT -2
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#define DHTLIB_INVALID_VALUE -999
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#define DHTLIB_DHT11_WAKEUP 18
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#define DHTLIB_DHT_WAKEUP 1
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// max timeout is 100usec.
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// For a 16Mhz proc that is max 1600 clock cycles
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// loops using TIMEOUT use at least 4 clock cycli
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// so 100 us takes max 400 loops
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// so by dividing F_CPU by 40000 we "fail" as fast as possible
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#define DHTLIB_TIMEOUT (F_CPU/40000)
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class dht
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{
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public:
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// return values:
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// DHTLIB_OK
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// DHTLIB_ERROR_CHECKSUM
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// DHTLIB_ERROR_TIMEOUT
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int read11(uint8_t pin);
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int read(uint8_t pin);
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inline int read21(uint8_t pin) { return read(pin); };
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inline int read22(uint8_t pin) { return read(pin); };
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inline int read33(uint8_t pin) { return read(pin); };
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inline int read44(uint8_t pin) { return read(pin); };
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float humidity;
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float temperature;
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private:
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uint8_t bits[5]; // buffer to receive data
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int _readSensor(uint8_t pin, uint8_t wakeupDelay);
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};
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#endif
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//
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// END OF FILE
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//
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