Soft i2c con sensores Sensirion SHT21 en Arduino Mega

He intentado verificar con un osciloscopio en los pines analógicos cuando el sensor está enchufado y parece que no obtengo nada como normalmente lo haría.

El canal i2c de hardware funciona bien en la mega, son los blandos que estoy tratando de usar que no parecen funcionar

#include <Wire.h>
#include <Ports.h>
#include <PortsSHT21.h>
#include <SHT2x.h>

//Define soft i2c channels for 3 sensors
  SHT21 hsensor2 (2); // pins A1 and D5 - Sensor 2
  SHT21 hsensor3 (3); // pins A2 and D6 - Sensor 3
  SHT21 hsensor4 (4); // pins A3 and D7 - Sensor 4

//define variables for temp data
  float h, t;


void setup() 
{
    Wire.begin();
   Serial.begin(9600);
}

void loop()
{
   // Get data from first sensor hard I2C channel
    float hum1 = (SHT2x.GetHumidity());
    float temp1 = (SHT2x.GetTemperature());
    Serial.println("temp1");
    Serial.println(temp1); 

  // Get data from second sensor soft I2C
  hsensor2.measure(SHT21::HUMI);
  hsensor2.measure(SHT21::TEMP);
  hsensor2.calculate(h, t);
    float hum2 = (h);
    float temp2 = (t);
    Serial.println("temp2");
    Serial.println(temp2);     

   // Get data from third sensor soft I2C
  hsensor3.measure(SHT21::HUMI);
  hsensor3.measure(SHT21::TEMP);
  hsensor3.calculate(h, t);
    float hum3 = (h);
    float temp3 = (t);
    Serial.println("temp3");
    Serial.println(temp3);     

 // Get data from fourth sensor soft I2C  
  hsensor4.measure(SHT21::HUMI);
  hsensor4.measure(SHT21::TEMP);
  hsensor4.calculate(h, t);  
    float hum4 = (h);
    float temp4 = (t);
    Serial.println("temp4");
    Serial.println(temp4);
    Serial.println("");
    Serial.println("");
    delay(500);
}