I2C Pressure Sensor

Other Hardware Sensors
18

Again Rob, I really appreciate your time and help !!

I appended and modified the code to the following complete sketch:

#include "Wire.h"
#define addrs 0x78 // I2C bus address


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

void loop()
{
  
   byte lobyte;
   byte hibyte;
   int Press;
     
   Wire.beginTransmission(addrs);
   Wire.write(1);        
   int x = Wire.endTransmission(); 

   Serial.print("endTransmission: ");
   Serial.println(x, DEC);
     
   Wire.requestFrom(addrs, 2); // contents of your first two registers
   while(Wire.available() < 2 );          // Check for data from slave
   {   
      delay(1000);
      lobyte = Wire.read();       // Read press high byte
      Serial.println(lobyte, DEC);
      hibyte = Wire.read();      // Read press low byte
      Serial.println(hibyte, DEC);
      
      Press = toPressure(hibyte, lobyte);
      Serial.print("Pressure: ");
      Serial.println(Press);
      
      delay(1000);
   } 
   
}
   
   
float toPressure(byte hi, byte lo)
{
  int t = (hi * 256 + lo) & 0x3FFF;  // see pdf, mask 14 bit
  
  float rv = (t - 1638.0) / 30.84 + 600.0;  // (t - 1638.0) * 0.032425422 + 600.0 // faster 
  return rv;
  
}

When the sketch Runs as is, i get the following out on the serial monitor:

endTransmission: 2
103
177
Pressure: 956
endTransmission: 0

I have two questions...

  1. Why is it when i remove the following lines of code, the serial monitor shows nothing, it seems to me it should have no affect ?
Serial.print("endTransmission: ");
Serial.println(x, DEC);
  1. How do i get it to constantly update and report the Pressure instead of only running once ?

Thanks,
Pete