Bme680 - Measuring Altitude and Gas Resistance

Altitude

Based on sensor reading

The altitude value can be calculated using the readAltitude() function. The value is determined by the pressure reading and the sea level.

void loop()
{
  float altitude;
  // Store the sensor data into the variable
  altitude = bme680.readAltitude();
  // Print the value onto the screen
  Serial.println("Altitude: " + String(altitude) + "m \n");
  delay(1000); // 1 second delay between measurements
}

Serial monitor

bme680.readAltitude()

Calculates the altitude by taking the pressure reading

Returns value: Float value of altitude in meters

Based on given pressure value

void loop()
{
  float altitude, pressure;
  // First get a pressure reading
  pressure = bme680.readPressure();
  // Store the calculated result into the variable
  altitude = bme680.calculateAltitude(pressure);
  // Print the value onto the screen
  Serial.println("Altitude: " + String(altitude) + "m \n");
  delay(1000); // 1 second delay between measurements
}

bme680.calculateAltitude(float pressure)

Calculates the altitude based on the given pressure value

Returns value: Float value representing altitude in meters

Function parameters:

Type	Name	Description
`float`	`pressure`	Pressure value in hPa

Gas Resistance

To get gas resistance readings, use the readGasResistance function. The sensor samples it in mOhms.

void loop()
{
  float gas;
  // Store the sensor data into the variable
  gas = bme680.readGasResistance();
  // Print the value onto the screen
  Serial.println("Gas Resistance: " + String(gas) + "mOhm \n");
  delay(1000); // 1 second delay between measurements
}

Serial monitor

bme680.readGasResistance()

Reads the value from the sensor and returns the scaled mOhm value

Returns value: Float value of the gas resistance in mOhms

Altitude​

Based on sensor reading​