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https://github.com/RobTillaart/Arduino.git
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71 lines
1.7 KiB
C++
71 lines
1.7 KiB
C++
//
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// FILE: dhtnew.h
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// AUTHOR: Rob Tillaart
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// VERSION: 0.1.3
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// PURPOSE: DHT Temperature & Humidity Sensor library for Arduino
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// URL: --
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//
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// HISTORY:
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// see dhtnew.cpp file
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//
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#ifndef dhtnew_h
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#define dhtnew_h
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#include <Arduino.h>
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#define DHTNEW_LIB_VERSION "0.1.3 - dhtnew"
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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 DHTNEW
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{
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public:
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DHTNEW(uint8_t pin);
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// 0 = unknown, 11 or 22
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int getType() { return _type; };
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int read();
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// lastRead is in MilliSeconds since start sketch
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uint32_t lastRead() { return _lastRead; };
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float humidity;
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float temperature;
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// adding offsets works well in normal range
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// but can introduce under- or overflow
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void setHumOffset(float offset) { _humOffset = offset; };
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void setTempOffset(float offset) { _tempOffset = offset; };
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float getHumOffset() { return _humOffset; };
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float getTempOffset() { return _tempOffset; };
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private:
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uint8_t _pin = 0;
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uint8_t _wakeupDelay = 0;
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uint8_t _type = 0;
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float _humOffset = 0.0;
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float _tempOffset = 0.0;
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uint32_t _lastRead = 0;
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uint8_t _bits[5]; // buffer to receive data
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int _read();
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int _readSensor();
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};
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#endif
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// END OF FILE
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