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define an empty constructor and overload DHT::begin

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edwin 2022-12-06 15:00:19 +08:00
parent b2be3b193b
commit e375a0b11f
2 changed files with 42 additions and 0 deletions
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40
DHT.cpp
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@ -30,6 +30,24 @@
UINT32_MAX /**< Used programmatically for timeout. \
Not a timeout duration. Type: uint32_t. */
/**
* @brief Instantiates a default DHT class
*
*/
DHT::DHT() {
_pin = 2; // pin 2 set as the default data pin
_type = DHT11; // using the DHT11 sensor as the default sensor type.
// Note that pin 2 and DHT11 are just default values to
// initialize members _pin and _type in the class definition.
// They can be modified via DHT::begin(uint8_t pin, uint8_t type, uint8_t usec).
#ifdef __AVR
_bit = digitalPinToBitMask(pin);
_port = digitalPinToPort(pin);
#endif
_maxcycles = microsecondsToClockCycles(1000); // 1 millisecond timeout for
// reading pulses from DHT sensor.
}
/*!
* @brief Instantiates a new DHT class
* @param pin
@ -72,6 +90,28 @@ void DHT::begin(uint8_t usec) {
pullTime = usec;
}
/**
* @brief Setup sensor pins and set pull timings
*
* @param pin
* pin number that sensor is connected
* @param type
* type of sensor
* @param usec
* Optionally pass pull-up time (in microseconds) before DHT reading
* starts. Default is 55 (see function declaration in DHT.h).
*/
void DHT::begin(uint8_t pin, uint8_t type, uint8_t usec)
{
_pin = pin;
_type = type;
#ifdef __AVR
_bit = digitalPinToBitMask(pin);
_port = digitalPinToPort(pin);
#endif
begin(usec);
}
/*!
* @brief Read temperature
* @param S

2
DHT.h
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@ -62,8 +62,10 @@ static const uint8_t AM2301{21}; /**< AM2301 */
*/
class DHT {
public:
DHT();
DHT(uint8_t pin, uint8_t type, uint8_t count = 6);
void begin(uint8_t usec = 55);
void begin(uint8_t pin, uint8_t type, uint8_t usec = 55);
float readTemperature(bool S = false, bool force = false);
float convertCtoF(float);
float convertFtoC(float);