温度と経過時間を記録する。



//              +------------+

//              |O          O|<-SDA =>Arduino A4                      

//              |    =--=    |                           

//         GND->|O   =  =   O|                           

//              |    =--=    |                           

//         VDD->|O    C1    O|<-SCL =>Arduino A5                          

//              |    -||-    |                           

//              +------------+

//                LM 73 (T731)
#include <SoftwareSerial.h>

#include <Wire.h>
#define LM73_ADDR 0x4c
int ret;

unsigned long time;
void setup()

{

  Wire.begin();

  Serial.begin(9600);

  delay(500);

  

  Wire.beginTransmission(LM73_ADDR);

  Wire.send((byte)0x04);

  Wire.send(0x60);        // 14 bits mode

  ret=Wire.endTransmission();
  Wire.beginTransmission(LM73_ADDR);

  Wire.send(0x00);

  ret=Wire.endTransmission();

  delay(100);

  

}
void loop()

{

  time = millis();

  int data=0 ;
  Wire.beginTransmission(LM73_ADDR);

  ret=Wire.requestFrom(LM73_ADDR, 2);

  

  data = 0;

  if (Wire.available()) {

    data = Wire.receive();

  } else {

    Serial.println("Wire not available.");

  }

  if (Wire.available()) {

    data = (data << 8 )| Wire.receive() ;

  }

    

  ret=Wire.endTransmission();

  

  Serial.print(time, DEC);

  printdata(data);

  delay(59985);
}

void printdata(int data){

  

  int data2;

  int data3;

  float data_f;

  

  boolean negative=false;
  if (data < 0 ) {

    negative=true;

    data = -data; 

  }
  data2 = data >> 7;
  data_f = (float)(data >> 2 ) / 32;

  data_f = data_f - data2 ;
  data3 = data_f * 100 ;
  Serial.print (", "); 

  if (negative) {

    Serial.print("-");

  }

  Serial.print(data2);

  Serial.print(".");

  Serial.print(data3/10);

  Serial.println(data3 % 10);
}