A minimal library for the DHT11.
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Diff: Dht22.h
- Revision:
- 2:1460b7a50ec0
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Dht22.h Fri Nov 10 20:28:29 2017 +0000 @@ -0,0 +1,74 @@ +#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