envirstation first commit

DHT.h

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+/*!
+ *  @file DHT.h
+ *
+ *  This is a library for DHT series of low cost temperature/humidity sensors.
+ *
+ *  You must have Adafruit Unified Sensor Library library installed to use this class.
+ *
+ *  Adafruit invests time and resources providing this open source code,
+ *  please support Adafruit andopen-source hardware by purchasing products
+ *  from Adafruit!
+ *
+ *  Written by Adafruit Industries.
+ *
+ *  MIT license, all text above must be included in any redistribution
+ */
+
+#ifndef DHT_H
+#define DHT_H
+
+#include "Arduino.h"
+
+/* Uncomment to enable printing out nice debug messages. */
+//#define DHT_DEBUG
+
+
+#define DEBUG_PRINTER Serial /**< Define where debug output will be printed. */
+
+/* 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(...) {} /**< Debug Print Placeholder if Debug is disabled */
+  #define DEBUG_PRINTLN(...) {} /**< Debug Print Line Placeholder if Debug is disabled */
+#endif
+
+/* Define types of sensors. */
+#define DHT11 11 /**< DHT TYPE 11 */
+#define DHT12 12 /**< DHY TYPE 12 */
+#define DHT22 22 /**< DHT TYPE 22 */
+#define DHT21 21 /**< DHT TYPE 21 */
+#define AM2301 21 /**< AM2301 */
+
+/*! 
+ *  @brief  Class that stores state and functions for DHT
+ */
+class DHT {
+  public:
+   DHT(uint8_t pin, uint8_t type, uint8_t count=6);
+   void begin(uint8_t usec=55);
+   float readTemperature(bool S=false, bool force=false);
+   float convertCtoF(float);
+   float convertFtoC(float);
+   float computeHeatIndex(bool isFahrenheit=true);
+   float computeHeatIndex(float temperature, float percentHumidity, bool isFahrenheit=true);
+   float readHumidity(bool force=false);
+   bool 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;
+  uint8_t pullTime; // Time (in usec) to pull up data line before reading
+
+  uint32_t expectPulse(bool level);
+
+};
+
+/*! 
+ *  @brief  Class that defines Interrupt Lock Avaiability
+ */
+class InterruptLock {
+  public:
+   InterruptLock() {
+#if !defined(ARDUINO_ARCH_NRF52)  
+    noInterrupts();
+#endif
+   }
+   ~InterruptLock() {
+#if !defined(ARDUINO_ARCH_NRF52)  
+    interrupts();
+#endif
+   }
+};
+
+#endif