I2C communication with a device with a fix adress

Other Hardware 3rd Party Boards
1

Hello everyone,

I would like to communicate with two or more of these proximity sensors :

The datasheet says they have a fix adress (0x13).
My question is : Is it possible to change that adress in order to communicate with two or more sensors using the same SDA and SCL pins ?
If i'm using a Leonardo or a Mega (which have additional I2C pins) can I wire one sensor to SDA and SCL pins and the second sensor to SDA1 and SCL1 pins ?

Then would I be able to communicate with both sensors despite the fix address ?

Thank you very much in advance :slight_smile:

2

The address is fixed, so you can't change it.

You can use two different I2C buses, yes.

To that end, you could use something like this chip:

There may be a breakout board for this or some other chip with similar functionality.

3

It is also possible to use a logic chips and make a mux yourself, for example with a simple chip like the 4051
http://playground.arduino.cc/learning/4051
Or the 74hc4052.

You will find more possibilities in the forum, since it is a common question. Try to search for 'i2c mux' or 'i2c switch'.

Do the Arduino Leonardo or Mega have a second I2C bus with SDA1 and SCL1 ? Maybe you have to look harder.

http://arduino.cc/en/Main/arduinoBoardMega2560