TVZ2020
Program očitava temperaturu i vlažnost zraka u prostoriji pomoću senzora DHT11. Očitane vrijednosti ispisuje na računalu u programu Tera Term. Za vlažnost zraka manju od 60% svijetli zelena LED, a za vlažnost zraka veću od 60% pali se crvena LED. Pritiskom na tipkalo prekida se rad programa na 5sekundi. Odbrojavanje se prikazuje na 7-segmentnom displey-u. Za to vrijeme ugašene su sve LED. Nakon isteka 5 sekundi program nastavlja sa radom tamo di je prethodno stao. Žuta LED predstavlja ticker i blinka svake 0,2 sekunde i time pokazuje da se program izvršava.
Diff: dht11.h
- Revision:
- 0:d2e26e6fa11b
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/dht11.h Tue Apr 06 12:12:07 2021 +0000
@@ -0,0 +1,74 @@
+#ifndef DHT11_H
+#define DHT11_H
+
+#include "mbed.h"
+
+#define DHTLIB_OK 0
+#define DHTLIB_ERROR_CHECKSUM -1
+#define DHTLIB_ERROR_TIMEOUT -2
+
+/** Class for the DHT11 sensor.
+ *
+ * Example:
+ * @code
+ * #include "mbed.h"
+ * #include "Dht11.h"
+ *
+ * Serial pc(USBTX, USBRX);
+ * Dht11 sensor(PTD7);
+ *
+ * int main() {
+ * sensor.read();
+ * pc.printf("T: %f, H: %d\r\n", sensor.getFahrenheit(), sensor.getHumidity());
+ * }
+ * @endcode
+ */
+class Dht11
+{
+public:
+ /** Construct the sensor object.
+ *
+ * @param pin PinName for the sensor pin.
+ */
+ Dht11(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