Bmp180 - Calculating altitude

Altitude can be calculated by measuring the pressure, knowing the baseline pressure, and then using the altitude() function.

⚠️

To calculate altitude, you should have a recent reading of the pressure at sea level for your location. Without it, the values will be very inaccurate.

    //...

    bmp180.getPressure(pressure, temperature);

    // Average sea level pressure (Getting a location-specific pressure is far more precise)
    double pressure_at_sea_level = 1013.25;

    double altitude = bmp180.altitude(pressure, pressure_at_sea_level);

    Serial.println("Current altitude: "+String(altitude)+" m");

    //...

Serial monitor

bmp180.altitude(double P, double P0)

Calculates altitude in meters based on the pressure reading and the baseline pressure at sea level.

Returns value: Double value, the altitude in meters

Function parameters:

Type	Name	Description
double	P	Absolute pressure value in mbars
double	P0	Baseline pressure at sea level in mbars

Full example

Try all the functions mentioned in this documentation through this example:

TempAndPressure.ino

Example file for using BMP180 sensor with easyC/Qwiic/I2C