mirror of
https://github.com/RobTillaart/Arduino.git
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72 lines
1.8 KiB
C++
72 lines
1.8 KiB
C++
//
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// FILE: dht.h
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// AUTHOR: Rob Tillaart
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// VERSION: 0.1.20
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// PURPOSE: DHT Temperature & Humidity Sensor library for Arduino
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// URL: http://arduino.cc/playground/Main/DHTLib
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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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#include <pins_arduino.h> // fix for broken pre 1.0 version - TODO TEST
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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 "0.1.20"
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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_DHT11_WAKEUP 18
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#define DHTLIB_DHT_WAKEUP 1
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#define DHTLIB_DHT11_LEADING_ZEROS 1
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#define DHTLIB_DHT_LEADING_ZEROS 6
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// max timeout is 100 usec.
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// For a 16 Mhz proc 100 usec is 1600 clock cycles
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// loops using DHTLIB_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 400 // (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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// DHTLIB_ERROR_CONNECT
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// DHTLIB_ERROR_ACK_L
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// DHTLIB_ERROR_ACK_H
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int8_t read11(uint8_t pin);
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int8_t read(uint8_t pin);
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inline int8_t read21(uint8_t pin) { return read(pin); };
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inline int8_t read22(uint8_t pin) { return read(pin); };
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inline int8_t read33(uint8_t pin) { return read(pin); };
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inline int8_t read44(uint8_t pin) { return read(pin); };
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double humidity;
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double temperature;
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private:
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uint8_t bits[5]; // buffer to receive data
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int8_t _readSensor(uint8_t pin, uint8_t wakeupDelay, uint8_t leadingZeroBits);
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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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