A minimal library for the DHT11.
Fork of DHT11 by
Dht22.h
- Committer:
- amithy
- Date:
- 2017-11-10
- Revision:
- 2:cc518592dbdb
File content as of revision 2:cc518592dbdb:
#ifndef DHT22_H #define DHT22_H #include "mbed.h" #define DHTLIB_OK 0 #define DHTLIB_ERROR_CHECKSUM -1 #define DHTLIB_ERROR_TIMEOUT -2 /** Class for the DHT22 sensor. * * Example: * @code * #include "mbed.h" * #include "Dht22.h" * * Serial pc(USBTX, USBRX); * Dht22 sensor(PTD7); * * int main() { * sensor.read() * pc.printf("T: %f, H: %d\r\n", sensor.getFahrenheit(), sensor.getHumidity()); * } * @endcode */ class Dht22 { public: /** Construct the sensor object. * * @param pin PinName for the sensor pin. */ Dht22(PinName const &p); /** Update the humidity and temp from the sensor. * * @returns * 0 on success, otherwise error. */ int read(); /** Get the temp(f) from the saved object. * * @returns * Fahrenheit float */ float getFahrenheit(); /** Get the temp(c) from the saved object. * * @returns * Celsius int */ int getCelsius(); /** Get the humidity from the saved object. * * @returns * Humidity percent int */ int getHumidity(); private: /// percentage of humidity int _humidity; /// celsius int _temperature; /// pin to read the sensor info on DigitalInOut _pin; /// times startup (must settle for at least a second) Timer _timer; }; #endif