Using BMP280 sensor to control servos. Need some guidance with coding

Projects General Guidance
22

Hi @mikami2020

I've tweaked your code, so that it should work with the BMP280_DEV library:

/////////////////////////////////////////////////////////////////////////////////
// BMP280_DEV - I2C Communications, Default Configuration, Normal Conversion
/////////////////////////////////////////////////////////////////////////////////
#include <Servo.h>
#include <BMP280_DEV.h>                           // Include the BMP280_DEV.h library

int pushButton = 2;
int servoPin1 = 9;
int servoPin2 = 10;
int servoPin3 = 11;
int greenLed = 13;

Servo Myservo1; //define servos
Servo Myservo2;
Servo Myservo3;

int servoPos=0;
float temperature, pressure, altitude;            // 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);                           // Initialise the serial port
  bmp280.begin();                                 // Default initialisation, place the BMP280 into SLEEP_MODE 
  //bmp280.setPresOversampling(OVERSAMPLING_X4);    // Set the pressure oversampling to X4
  //bmp280.setTempOversampling(OVERSAMPLING_X1);    // Set the temperature oversampling to X1
  //bmp280.setIIRFilter(IIR_FILTER_4);              // Set the IIR filter to setting 4
  bmp280.setTimeStandby(TIME_STANDBY_2000MS);     // Set the standby time to 2 seconds
  bmp280.startNormalConversion();                 // Start BMP280 continuous conversion in NORMAL_MODE  
  pinMode(greenLed,OUTPUT);
  Myservo1.attach(servoPin1);
  Myservo2.attach(servoPin2);
  Myservo3.attach(servoPin3);
}

void loop() 
{
  digitalWrite(greenLed, HIGH);
  if (bmp280.getMeasurements(temperature, pressure, altitude))    // Check if the measurement is complete
  {
    Serial.print(temperature);                    // Display the results    
    Serial.print(F("*C   "));
    Serial.print(pressure);    
    Serial.print(F("hPa   "));
    Serial.print(altitude);
    Serial.println(F("m")); 
    
    if (altitude > -14.5)
    {
      Myservo1.write(90);
      Myservo2.write(90);
      Myservo3.write(90);
    }
    else
    {
      Myservo1.write(0);
      Myservo2.write(0);
      Myservo3.write(0);
    }
  }
}

This will cause the code to sample the barometer every 2 seconds without stopping in the loop(), in other words non-blocking.

The sample rate can be changed by amending the line in the setup() function:

bmp280.setTimeStandby(TIME_STANDBY_2000MS);     // Set the standby time to 2 seconds

It can be replaced by any of these intervals:

TIME_STANDBY_05MS 
TIME_STANDBY_62MS  
TIME_STANDBY_125MS    
TIME_STANDBY_250MS   
TIME_STANDBY_500MS    
TIME_STANDBY_1000MS   
TIME_STANDBY_2000MS   
TIME_STANDBY_4000MS