mirror of
https://github.com/RobTillaart/Arduino.git
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69 lines
1.5 KiB
C++
69 lines
1.5 KiB
C++
#pragma once
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//
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// FILE: dht2pin.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/DHT2pin
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// http://arduino.cc/playground/Main/DHTLib
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#include <Arduino.h>
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#define DHT2PIN_LIB_VERSION (F("0.2.1"))
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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_ERROR_CONNECT -3
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#define DHTLIB_ERROR_ACK_L -4
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#define DHTLIB_ERROR_ACK_H -5
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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 processor that is max 1600 clock cycles
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// loops using TIMEOUT use at least 4 clock cycles
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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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#ifdef F_CPU
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#define DHTLIB_TIMEOUT (F_CPU/40000)
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#else
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#define DHTLIB_TIMEOUT (75000000/40000)
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#endif
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class DHT2pin
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{
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public:
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DHT2pin(uint8_t rpin, uint8_t wpin);
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void begin();
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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();
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int read();
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float humidity();
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float temperature();
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private:
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uint8_t _rpin;
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uint8_t _wpin;
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uint8_t _bits[5]; // buffer to receive data
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float _humidity;
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float _temperature;
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int _readSensor(uint8_t wakeupDelay);
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};
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// -- END OF FILE --
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