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