i2c ID

Community Projects
1

Hi everyone. I am new to the world of micro controllers and all that it brings.

I stumbled on the youtube clips and decided to have a go. My question is this.

Following Jeremy Blum/Arduino tutorials I had a go at 1408EGK tc740a temp sensor.

I understand that it is an I2c temp sensor.

How do I find it’s ID in the tutorial they use 72 but they state that it comes pre set any help would be great

2

Links ??

3

Check the data sheet. It should be there for any I2C addressable device.

4

One of the most useful bits of code I have for working with I2C is Nick Gammon’s I2C Scanner. It’s simple. It’s brute force. It works.

// I2C Scanner
// Written by Nick Gammon
// Date: 20th April 2011

#include <Wire.h>

void setup() {
  Serial.begin(115200);

  delay(5000);

  Serial.println ();
  Serial.println ("I2C scanner. Scanning ...");
  byte count = 0;
  
  Wire.begin();
  TWBR = 12;  // 400 kHz (maximum)
  //TWBR = 32;  // 200 kHz
  //TWBR = 72;  // 100 kHz (default)
  //TWBR = 152;  // 50 kHz
  //TWBR = 78;  // 25 kHz 
  //TWSR |= _BV (TWPS0);  // change prescaler
  //TWBR = 158;  // 12.5 kHz 
  //TWSR |= _BV (TWPS0);  // change prescaler

  for (byte i = 1; i < 120; i++)
  {
    Wire.beginTransmission (i);
    if (Wire.endTransmission () == 0)
      {
      Serial.print ("Found address: ");
      Serial.print (i, DEC);
      Serial.print (" (0x");
      Serial.print (i, HEX);
      Serial.println (")");
      count++;
      delay (1);  // maybe unneeded?
      } // end of good response
  } // end of for loop
  Serial.println ("Done.");
  Serial.print ("Found ");
  Serial.print (count, DEC);
  Serial.println (" device(s).");
}  // end of setup

void loop() {
Serial.println ("Loop.");
delay(20000);
}

Have fun with your projects.

  • Chip