Change I2C-address of the srf08 with arduino

Other Hardware Sensors
2

You have to send it in one sequence, not 4 and use the correct values as the datasheet describes:

#include <Wire.h>

#define Old_Address 0x70
#define New_Address 0xF2

void setup() {

  Wire.begin();
  
  delay(100);
  
    Wire.beginTransmission(Old_Address);
    Wire.write(0);
    //Wire.write(0xA0);
    Wire.write(0x50);
    Wire.endTransmission();
    delay(60);
     
    Wire.beginTransmission(Old_Address);
    Wire.write(0xA0);
    Wire.write(0xAA);
    Wire.write(0xA5);
    Wire.write(New_Address);
    Wire.endTransmission();
}
  
void loop(){
}

After that you have to use the new address, which will be 0x79 (8bit 0xF2 shifted to the right one bit).