Getting wrong values when reading data from sensors with i2C TCA9548A i2C multiplexer getting bad values from BMP180 sensors multuplexer TCA9548A

Other Hardware LEDs and Multiplexing
11

Thank you very much guys! PaulRB articularly!
It works :wink:

final code:


#include <Wire.h>
#include <SFE_BMP180.h>
 
#define TCAADDR 0x70
  void tcaselect(uint8_t i) {
  if (i > 7) return;
 
  Wire.beginTransmission(TCAADDR);
  Wire.write(1 << i);
  Wire.endTransmission();  
}

 const int maxtca=4; // nombre de voies utilisées


//SFE_BMP180 pressure[tca];
//SFE_BMP180 pressure[0];
//SFE_BMP180 pressure[1];
//SFE_BMP180 pressure[2];
//SFE_BMP180 pressure[3];

SFE_BMP180 pressure[maxtca];

void setup() {
  Serial.begin(9600);
  Wire.begin();
          
  Serial.println("Starting Initialization");     


for (byte tca = 0; tca < maxtca; tca++) {
  
  tcaselect(tca); 
  //Serial.println(tca);  
  pressure[tca].begin();
}
 
//pressure.begin();
//   delay(100);
//pressure_1.begin();
//   delay(100);
//pressure_2.begin();
//   delay(100);
//pressure_3.begin();

Serial.println("Initialization Finished");


}

void loop() 
{ 
  char status;
for (byte tca = 0; tca < maxtca; tca++) { tcaselect(tca); 
  double T,P;

  status = pressure[tca].startTemperature();
  if (status != 0)
  {
    // Wait for the measurement to complete:
    delay(status);

    status = pressure[tca].getTemperature(T);
    if (status != 0)
    {
      // Print out the measurement:
      Serial.print("BMP: ");
      Serial.print(tca);
      Serial.print(" _ T: ");
      Serial.print(T,2);
    Serial.print(" °C, ");

      status = pressure[tca].startPressure(3);
      if (status != 0)
      {
        // Wait for the measurement to complete:
        delay(status);

        status = pressure[tca].getPressure(P,T);
        if (status != 0)
        {
          Serial.print("P: ");
          Serial.print(P,2);
          Serial.println(" mb ");
        }
        else Serial.println("error retrieving pressure measurement\n");
      }
      else Serial.println("error starting pressure measurement\n");
    }
    else Serial.println("error retrieving temperature measurement\n");
  }
  else Serial.println("error starting temperature measurement\n");   
 };  
    
Serial.println("  ");
   delay(1000);   
 
}

and serial monitor:

09:33:56.430 -> Starting Initialization
09:33:56.465 -> Initialization Finished
09:33:56.465 -> BMP: 0 _ T: 21.15 °C, P: 1018.10 mb 
09:33:56.535 -> BMP: 1 _ T: 22.74 °C, P: 1021.37 mb 
09:33:56.570 -> BMP: 2 _ T: 22.46 °C, P: 1016.75 mb 
09:33:56.605 -> BMP: 3 _ T: 24.05 °C, P: 1016.50 mb 
09:33:56.640 ->   
09:33:57.585 -> BMP: 0 _ T: 21.15 °C, P: 1018.06 mb 
09:33:57.655 -> BMP: 1 _ T: 22.74 °C, P: 1021.38 mb 
09:33:57.690 -> BMP: 2 _ T: 22.44 °C, P: 1016.66 mb 
09:33:57.725 -> BMP: 3 _ T: 24.05 °C, P: 1016.51 mb 
09:33:57.760 ->   
09:33:58.740 -> BMP: 0 _ T: 21.15 °C, P: 1018.06 mb 
09:33:58.775 -> BMP: 1 _ T: 22.74 °C, P: 1021.41 mb 
09:33:58.810 -> BMP: 2 _ T: 22.46 °C, P: 1016.75 mb 
09:33:58.845 -> BMP: 3 _ T: 24.02 °C, P: 1016.42 mb