Omron sensor and i2c

[vikneshan]

Silly me , was missing one line of code in the setup "Wire.begin()"

Thanks!

#include "Wire.h"
#define addrs 0x6C // I2C bus address
int P;
int I;
float T;

int initialize(int i2c_addr)
{
  //INITIALIZATION AFTER POWER UP
  Wire.beginTransmission(i2c_addr);
  Wire.write(0x0B);  
  Wire.write(0x00); 
  int x = Wire.endTransmission(); 
  return x;
}

int pressure(int i2c_addr)
{
  //MCU MODE
  Wire.beginTransmission(i2c_addr);
  Wire.write(0x00);   
  Wire.write(0xD0);  // reg 0 - address register high byte 
//  Wire.write(0x51);  // reg 1 - address register low byte
  Wire.write(0x40);  // reg 1 - address register low byte
  Wire.write(0x18);  // reg 2  - serial control register - indicate # bytes among others (page 7 bottom)
  Wire.write(0x06);  // reg 3 - value to be written to SENS control register
  int x = Wire.endTransmission(); 

  delay(33);

  //WRITE
  Wire.beginTransmission(i2c_addr);
  Wire.write(0x00);   
  Wire.write(0xD0);
  Wire.write(0x51);
  Wire.write(0x2C);
  x = Wire.endTransmission(); 
  
  //READ
  Wire.beginTransmission(i2c_addr);
  Wire.write(0x07);
  x = Wire.endTransmission(); 

  Wire.requestFrom(i2c_addr, 2);
  byte hibyte = Wire.read();
  byte lobyte = Wire.read();
  long raw = word( hibyte, lobyte);  
  //Serial.print("raw pressure:\t ");
  //Serial.println(raw); 
  
  // D6F-PH5050AD3 ==> rangeMode=500 ==> int rd_pressure =  ((raw - 1024) * rangeMode * 2 / 60000L) - rangeMode
  // D6F-PH0505AD3 ==> rangeMode=50  ==> int rd_pressure =  ((raw - 1024) * rangeMode * 2 / 60000L) - rangeMode
  // D6F-PH0025AD1 ==> rangeMode=250 ==> int rd_pressure=(raw - 1024) * rangeMode / 60000L
  int rangeMode = 50;
  int rd_pressure =  ((raw - 1024) * rangeMode * 2 / 60000L) - rangeMode;
  return rd_pressure;
}

float temperature(int i2c_addr)
{
  //MCU MODE
  Wire.beginTransmission(i2c_addr);
  Wire.write(0x00);   
  Wire.write(0xD0);  // reg 0 - address register high byte 
  // Wire.write(0x51);  // reg 1 - address register low byte
  Wire.write(0x40);  // reg 1 - address register low byte  
  Wire.write(0x18);  // reg 2  - serial control register - indicate # bytes among others (page 7 bottom)
  Wire.write(0x06);  // reg 3 - value to be written to SENS control register
  int x = Wire.endTransmission(); 

  delay(33);
  
  //WRITE
  Wire.beginTransmission(i2c_addr);
  Wire.write(0x00);   
  Wire.write(0xD0);
  Wire.write(0x61);
  Wire.write(0x2C);
  x = Wire.endTransmission(); 
  
  //READ
  Wire.beginTransmission(i2c_addr);
  Wire.write(0x07);
  x = Wire.endTransmission(); 

  Wire.requestFrom(i2c_addr, 2);  
  byte hibyte = Wire.read();
  byte lobyte = Wire.read();
  long raw = word( hibyte, lobyte);  
  //Serial.print("raw temperature:\t ");
  //Serial.println(raw); 
  int temp = round((float)(raw - 10214) / 3.739);	// this is the temperature multiplied by 10...
  return (temp/10.0); 						// ...and the function returs the float temperature with 0.1°C resolution
}

void setup()
{  // Open serial communications 
 Wire.begin();
  Serial.begin(9600);
 I=initialize (addrs); // start wire connection

}

void loop()
{
    P=pressure(addrs);
    Serial.print("pressure:\t ");
    Serial.println(P);
    T=temperature(addrs);
    Serial.print("temperature:\t ");
    Serial.println(T);
    delay(30000); //delay for 30 seconds

}