MyBME280 Class Reference

#include <BME280.h>

Public Member Functions
	MyBME280 (MyOptions &options, MyData &data, int pin, uint8_t addr)
bool	begin ()
bool	readValues ()

Protected Attributes
MyOptions &	myOptions
	Reference to global options.
MyData &	myData
	Reference to global data.
int	pinGrnd
	Ground-Pin connection to switch on the BME280 module.
uint8_t	portAddr
	Port address of the bme280.
Adafruit_BME280	bme280
	Adafruit BME280 helper interface.

Detailed Description

Communication with the BME280 modul to read temperature, humidity and pressure

Definition at line 32 of file BME280.h.

Constructor & Destructor Documentation

MyBME280::MyBME280	(	MyOptions &	options,
		MyData &	data,
		int	pin,
		uint8_t	addr
	)

Constructor

Definition at line 52 of file BME280.h.

   : pinGrnd(pin)
   , myOptions(options)
   , myData(data)
   , portAddr(addr)
{
}

Member Function Documentation

bool MyBME280::begin

(

)

Switch off the module at startup to safe power.

Definition at line 61 of file BME280.h.

References pinGrnd.

Referenced by setup().

{
   pinMode(D1,      INPUT); // I2C SCL Open state to safe power
   pinMode(D2,      INPUT); // I2C SDA Open state to safe power
   pinMode(pinGrnd, OUTPUT);
   digitalWrite(pinGrnd, HIGH); 
}

bool MyBME280::readValues

(

)

Switch on the modul, read the values and switch off the modul to save power. Do this only every bme280CheckIntervalSec

Definition at line 73 of file BME280.h.

References BARO_CORR_HPA, bme280, MyOptions::bme280CheckIntervalSec, MyData::humidity, MyData::RtcData::lastBme280ReadSec, myData, MyDbg(), myOptions, pinGrnd, portAddr, MyData::pressure, MyData::rtcData, secondsElapsedAndUpdate(), TEMP_CORR_DEGREE, and MyData::temperature.

Referenced by loop().

{
   if (secondsElapsedAndUpdate(myData.rtcData.lastBme280ReadSec, myOptions.bme280CheckIntervalSec)) {
      digitalWrite(pinGrnd, LOW);
      delay(100); // Short delay after power on
      if (!bme280.begin(portAddr)) {
         myData.temperature = 0;
         myData.humidity    = 0;
         myData.pressure    = 0;
         MyDbg("No valid BME280 sensor, check wiring!");
      } else {
         myData.temperature = bme280.readTemperature() + TEMP_CORR_DEGREE;
         myData.humidity    = bme280.readHumidity();
         myData.pressure    = (bme280.readPressure() / 100.0F) + BARO_CORR_HPA;
         MyDbg("Temperature: " + String(myData.temperature) + "°C");
         MyDbg("Humidity: "    + String(myData.humidity)    + "%");
         MyDbg("Pressure: "    + String(myData.pressure)    + "hPa");
      }
      digitalWrite(pinGrnd, HIGH); 
      pinMode(D1, INPUT); // I2C SCL Open state to safe power
      pinMode(D2, INPUT); // I2C SDA Open state to safe power
   }
}

---

The documentation for this class was generated from the following file:

• tracker/BME280.h