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#include <Wire.h>
 
#define LPS25H_ADDRESS  0x5c /* SA0 -> GND */
#define LPS25H_WHO_AM_I     0x0f
#define LPS25H_CTRL_REG1    0x20
#define LPS25H_PRESS_OUT_XL 0x28
#define LPS25H_PRESS_OUT_L  0x29
#define LPS25H_PRESS_OUT_H  0x2a
#define LPS25H_TEMP_OUT_L   0x2b
#define LPS25H_TEMP_OUT_H   0x2c
 
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  Wire.begin();
   
  Serial.print("WHO_AM_I = 0x");
  Serial.println(whoAmI(), HEX);
   
  setCtrlReg1();
}
 
void loop() {
  // put your main code here, to run repeatedly:
  Serial.print("Pressure = ");
  Serial.print(getPressure());
  Serial.print(" hPa, Temperature = ");
  Serial.print(getTemperature());
  Serial.println(" degree");
   
  //getPressure();
  delay(1000);
}
 
int whoAmI() {
  Wire.beginTransmission(LPS25H_ADDRESS);
  Wire.write(LPS25H_WHO_AM_I);
  Wire.endTransmission();
   
  Wire.requestFrom(LPS25H_ADDRESS, 1);
  while(Wire.available() < 1) {
    ;
  }
   
  return Wire.read();
}
 
void setCtrlReg1() {
  Wire.beginTransmission(LPS25H_ADDRESS);
  Wire.write(LPS25H_CTRL_REG1);
  Wire.write(0x90);
  Wire.endTransmission();
}
 
float getPressure() {
  long pData = 0;
   
  for (int i = 0; i < 3; i++) {
    Wire.beginTransmission(LPS25H_ADDRESS);
    Wire.write(LPS25H_PRESS_OUT_XL + i);
    Wire.endTransmission();
 
    Wire.requestFrom(LPS25H_ADDRESS, 1);
    while(Wire.available() < 1) {
      ;
    }
     
    pData |= Wire.read() << (8 * i);
  }
   
  return pData / 4096.0;
}
 
float getTemperature() {
  short tData = 0;
   
  for (int i = 0; i < 2; i++) {
    Wire.beginTransmission(LPS25H_ADDRESS);
    Wire.write(LPS25H_TEMP_OUT_L + i);
    Wire.endTransmission();
 
    Wire.requestFrom(LPS25H_ADDRESS, 1);
    while(Wire.available() < 1) {
      ;
    }
     
    tData |= Wire.read() << (8 * i);
  }
   
  return 42.5 + tData / 480.0;
}