mirror of
https://github.com/RobTillaart/Arduino.git
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77 lines
2.2 KiB
C++
77 lines
2.2 KiB
C++
#pragma once
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//
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// FILE: DHTStable.h
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// AUTHOR: Rob Tillaart
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// VERSION: 1.0.1
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// PURPOSE: DHT Temperature & Humidity Sensor library for Arduino
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// URL: https://github.com/RobTillaart/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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#include "Arduino.h"
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#define DHTSTABLE_LIB_VERSION (F("1.0.1 - DHTStable"))
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const int DHTLIB_OK = 0;
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const int DHTLIB_ERROR_CHECKSUM = -1;
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const int DHTLIB_ERROR_TIMEOUT = -2;
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const int DHTLIB_INVALID_VALUE = -999;
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const int DHTLIB_DHT11_WAKEUP = 18;
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const int 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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const int DHTLIB_TIMEOUT = (F_CPU/40000);
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class DHTStable
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{
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public:
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DHTStable();
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void reset();
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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); // DHT11 & DHT12
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int read(uint8_t pin); // DHT22
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inline int read12(uint8_t pin) { return read11(pin); }; // ok
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inline int read21(uint8_t pin) { return read(pin); }; // ok
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inline int read22(uint8_t pin) { return read(pin); }; // ok
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inline int read33(uint8_t pin) { return read(pin); }; // ok
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inline int read44(uint8_t pin) { return read(pin); }; // ok
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inline int read2301(uint8_t pin) { return read(pin); }; // ok
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inline int read2302(uint8_t pin) { return read(pin); }; // ok
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inline int read2320(uint8_t pin) { return read(pin); }; //.ok
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inline int read2322(uint8_t pin) { return read(pin); }; // ok
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// read values from cache, call read() to refresh!
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float getHumidity() { return _humidity; };
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float getTemperature() { return _temperature; };
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bool getDisableIRQ() { return _disableIRQ; };
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void setDisableIRQ(bool b ) { _disableIRQ = b; };
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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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bool _disableIRQ = false;
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float _humidity;
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float _temperature;
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};
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// -- END OF FILE --
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