mirror of
https://github.com/adafruit/DHT-sensor-library.git
synced 2023-10-23 22:20:38 +03:00
108 lines
3.0 KiB
C++
108 lines
3.0 KiB
C++
/*!
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* @file DHT.h
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*
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* This is a library for DHT series of low cost temperature/humidity sensors.
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*
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* You must have Adafruit Unified Sensor Library library installed to use this
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* class.
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*
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* Adafruit invests time and resources providing this open source code,
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* please support Adafruit andopen-source hardware by purchasing products
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* from Adafruit!
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*
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* Written by Adafruit Industries.
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*
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* MIT license, all text above must be included in any redistribution
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*/
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#ifndef DHT_H
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#define DHT_H
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#include "Arduino.h"
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/* Uncomment to enable printing out nice debug messages. */
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//#define DHT_DEBUG
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#define DEBUG_PRINTER \
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Serial /**< Define where debug output will be printed. \
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*/
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/* Setup debug printing macros. */
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#ifdef DHT_DEBUG
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#define DEBUG_PRINT(...) \
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{ DEBUG_PRINTER.print(__VA_ARGS__); }
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#define DEBUG_PRINTLN(...) \
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{ DEBUG_PRINTER.println(__VA_ARGS__); }
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#else
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#define DEBUG_PRINT(...) \
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{} /**< Debug Print Placeholder if Debug is disabled */
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#define DEBUG_PRINTLN(...) \
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{} /**< Debug Print Line Placeholder if Debug is disabled */
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#endif
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/* Define types of sensors. */
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#define DHT11 11 /**< DHT TYPE 11 */
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#define DHT12 12 /**< DHY TYPE 12 */
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#define DHT22 22 /**< DHT TYPE 22 */
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#define DHT21 21 /**< DHT TYPE 21 */
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#define AM2301 21 /**< AM2301 */
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#if (TARGET_NAME == ARDUINO_NANO33BLE)
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// As of 7 Sep 2020 the Arduino Nano 33 BLE boards do not have
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// microsecondsToClockCycles defined.
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#ifndef microsecondsToClockCycles
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#define microsecondsToClockCycles(a) ((a) * (SystemCoreClock / 1000000L))
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#endif
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#endif
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/*!
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* @brief Class that stores state and functions for DHT
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*/
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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(uint8_t usec = 55);
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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(bool isFahrenheit = true);
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float computeHeatIndex(float temperature, float percentHumidity,
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bool isFahrenheit = true);
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float readHumidity(bool force = false);
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bool 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
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// bitmask for the digital pin connected to the DHT. Other platforms will use
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// 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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uint8_t pullTime; // Time (in usec) to pull up data line before reading
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uint32_t expectPulse(bool level);
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};
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/*!
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* @brief Class that defines Interrupt Lock Avaiability
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*/
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class InterruptLock {
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public:
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InterruptLock() {
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#if !defined(ARDUINO_ARCH_NRF52)
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noInterrupts();
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#endif
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}
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~InterruptLock() {
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#if !defined(ARDUINO_ARCH_NRF52)
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interrupts();
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#endif
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}
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};
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#endif
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