Hello

Is it possible to connect more than one i2c sensor on a single sensorport without using a port multiplexer?
they wil all need a different i2c adress i think, but are there more problems doing this?

Regards Gerrit

yes

yes

no.

You do have to be careful how you chain then together to make sure that the propper voltage is getting to each device.

Hello,

Thanks for response.

How do you change the i2c adress of hitechnic sensors?

Which ones? You may not need to.

the original Lego Sensors have fixed I²C addresses which can't be changed (always= 2 as far as I know).

The addresses of some Hitchnic or Mindsensors Sensors can be changed, here you have to refer to the manuals.

Hi NXT

Here is some code that may help you out. It is used to change the address of a mindsensor sensor, don't know if it will work on a hitechnic sensor, I think it will, excluding the sensors that come in the nxt kit.

http://www.freewebs.com/robotprojects/I2C%20Address%20Changer.c

all you need to do to use it is to change the last line of code and set the port of the sensor.
Change_add(Current Address , New Address);
Example code:
Change_add(0x02,0xA2);
This will change the sensors address from 0x02 to 0xA2

After that I suggest using this program to scan the port to make sure the address got changed. Make sure you sect the correct port to scan in the code.

http://www.freewebs.com/robotprojects/I2C%20Explorer.c

Good luck, hope this will help B-)