initial upload

examples/osd/arduino-dht/DHT-sensor-library-master/DHT.h

@@ -0,0 +1,75 @@
+/* DHT library
+
+MIT license
+written by Adafruit Industries
+*/
+#ifndef DHT_H
+#define DHT_H
+
+#if ARDUINO >= 100
+ #include "Arduino.h"
+#else
+ #include "WProgram.h"
+#endif
+
+
+// Uncomment to enable printing out nice debug messages.
+//#define DHT_DEBUG
+
+// Define where debug output will be printed.
+#define DEBUG_PRINTER Serial
+
+// Setup debug printing macros.
+#ifdef DHT_DEBUG
+  #define DEBUG_PRINT(...) { DEBUG_PRINTER.print(__VA_ARGS__); }
+  #define DEBUG_PRINTLN(...) { DEBUG_PRINTER.println(__VA_ARGS__); }
+#else
+  #define DEBUG_PRINT(...) {}
+  #define DEBUG_PRINTLN(...) {}
+#endif
+
+// Define types of sensors.
+#define DHT11 11
+#define DHT22 22
+#define DHT21 21
+#define AM2301 21
+
+
+class DHT {
+  public:
+   DHT(uint8_t pin, uint8_t type, uint8_t count=6);
+   void begin(void);
+   float readTemperature(bool S=false, bool force=false);
+   float convertCtoF(float);
+   float convertFtoC(float);
+   float computeHeatIndex(float temperature, float percentHumidity, bool isFahrenheit=true);
+   float readHumidity(bool force=false);
+   boolean read(bool force=false);
+
+ private:
+  uint8_t data[5];
+  uint8_t _pin, _type;
+  #ifdef __AVR
+    // Use direct GPIO access on an 8-bit AVR so keep track of the port and bitmask
+    // for the digital pin connected to the DHT.  Other platforms will use digitalRead.
+    uint8_t _bit, _port;
+  #endif
+  uint32_t _lastreadtime, _maxcycles;
+  bool _lastresult;
+
+  uint32_t expectPulse(bool level);
+
+};
+
+class InterruptLock {
+  public:
+   InterruptLock() {
+    noInterrupts();
+   }
+   ~InterruptLock() {
+    interrupts();
+   }
+
+};
+
+#endif