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