Andrew's git - arduino-weather.git/blob - libraries/Adafruit

   1/* DHT library
   2
   3MIT license
   4written by Adafruit Industries
   5*/
   6#ifndef DHT_H
   7#define DHT_H
   8
   9#if ARDUINO >= 100
  10 #include "Arduino.h"
  11#else
  12 #include "WProgram.h"
  13#endif
  14
  15
  16// Uncomment to enable printing out nice debug messages.
  17//#define DHT_DEBUG
  18
  19// Define where debug output will be printed.
  20#define DEBUG_PRINTER Serial
  21
  22// Setup debug printing macros.
  23#ifdef DHT_DEBUG
  24  #define DEBUG_PRINT(...) { DEBUG_PRINTER.print(__VA_ARGS__); }
  25  #define DEBUG_PRINTLN(...) { DEBUG_PRINTER.println(__VA_ARGS__); }
  26#else
  27  #define DEBUG_PRINT(...) {}
  28  #define DEBUG_PRINTLN(...) {}
  29#endif
  30
  31// Define types of sensors.
  32#define DHT11 11
  33#define DHT22 22
  34#define DHT21 21
  35#define AM2301 21
  36
  37
  38class DHT {
  39  public:
  40   DHT(uint8_t pin, uint8_t type, uint8_t count=6);
  41   void begin(void);
  42   float readTemperature(bool S=false, bool force=false);
  43   float convertCtoF(float);
  44   float convertFtoC(float);
  45   float computeHeatIndex(float temperature, float percentHumidity, bool isFahrenheit=true);
  46   float readHumidity(bool force=false);
  47   boolean read(bool force=false);
  48
  49 private:
  50  uint8_t data[5];
  51  uint8_t _pin, _type;
  52  #ifdef __AVR
  53    // Use direct GPIO access on an 8-bit AVR so keep track of the port and bitmask
  54    // for the digital pin connected to the DHT.  Other platforms will use digitalRead.
  55    uint8_t _bit, _port;
  56  #endif
  57  uint32_t _lastreadtime, _maxcycles;
  58  bool _lastresult;
  59
  60  uint32_t expectPulse(bool level);
  61
  62};
  63
  64class InterruptLock {
  65  public:
  66   InterruptLock() {
  67    noInterrupts();
  68   }
  69   ~InterruptLock() {
  70    interrupts();
  71   }
  72
  73};
  74
  75#endif