Z_IMU_RP2040_BARO_ALTIMETER.ino

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/*
Zarvan Movdawalla
Version 0.1
BMP280 , RP2040
BARO ALTIMETER
DUAL CORE COMPATIBLE

STRICTLY not for commercial use. 
STRICTLY not for safety-critical/unsafe/hazardous applications.

Licensed under: CC BY-NC-SA


Users assume all risks associated with the use of ZarvanM's AHRS-PID algorithm and software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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#include <BMP280_DEV.h>                           // Include the BMP280_DEV.h library

float temperature, pressure, altitude, adjustment,corrected_alt=0;            // Create the temperature, pressure and altitude variables
BMP280_DEV bmp280;                                // Instantiate (create) a BMP280_DEV object and set-up for I2C operation (address 0x77)

void setup() 
{
  Serial.begin(115200);  
  while(!Serial)
  {
  }  
  
  bmp280.begin(0x76);                    
  //params optimized for indoor+outdoor testing, 1m accuracy easily attainable. DO NOT CHANGE ARBITRARILY!
  bmp280.setPresOversampling(OVERSAMPLING_X16);    
  bmp280.setTempOversampling(OVERSAMPLING_X16);    
  bmp280.setIIRFilter(IIR_FILTER_8);              
  bmp280.setTimeStandby(TIME_STANDBY_05MS);     
  bmp280.setSeaLevelPressure(1009);              
  
  delay(1000);

  bmp280.startForcedConversion();                 // Start BMP280 continuous conversion in NORMAL_MODE 
  delay(100);
  bmp280.getCurrentMeasurements(temperature, pressure, altitude);    // Check if the measurement is complete   
    adjustment = altitude;

    Serial.print(temperature);                    // Display the results    
    Serial.print(F("*C   "));
    Serial.print(pressure);    
    Serial.print(F("hPa   "));
    Serial.print(adjustment);
    Serial.println(F("m")); 
    delay(3500); 
}

void loop() 
{
  bmp280.startForcedConversion();                 
  bmp280.getMeasurements(temperature, pressure, altitude);    
  //corrected_alt here refers to a pseudo ground level determination. Vital for ANY multirotor application.
  corrected_alt = altitude - adjustment;
  
    Serial.print(temperature);                    
    Serial.print(F("*C   "));
    Serial.print(pressure);    
    Serial.print(F("hPa   "));
    Serial.print(corrected_alt);
    Serial.println(F("m"));  
  
}