st-anything/lib/DHT/dht.h
Gašper Dobrovoljc ec125f27db
IP Configuration
2023-03-11 15:11:03 +01:00

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
//