#ifndef DHT11_H
#define DHT11_H

#if defined(ARDUINO) && (ARDUINO>=100)
#include <Arduino.h>
#else
#include <WProgram.h>
#endif

#define _DHT11_MAX_ITERS 10000
#define _DHT11_START_SIGNAL_WAIT 20
#define _DHT11_RESPONSE_WAIT  5
#define _DHT11_ONE_THRESHOLD 40
#define _DHT11_RESPONSE_SIZE  5
#define _DHT11_BITS_PER_BYTE  8
#define _DHT11_BYTE_MS_BIT  7
#define _DHT11_HUMIDITY_INDEX  0
#define _DHT11_TEMPERATURE_INDEX  2
#define _DHT11_CHECKSUM_INDEX  4
#define _DHT11_BITS_IN(object) (8 * sizeof((object)))

class DHT11 {
public:
	enum Status {
		OK,
		ERROR_CHECKSUM,
		ERROR_TIMEOUT,
	};

	DHT11(uint8_t pin);
	Status read();
	int getHumidity();
	int getTemperature();

private:
	int _humidity;
	int _temperature;
	uint8_t _pin;

	Status waitForPinChange(const int old, unsigned int maxIter=_DHT11_MAX_ITERS);
};

#endif // DHT11_H