View unanswered posts | View active topics It is currently Sat Sep 26, 2020 3:40 am

Reply to topic  [ 4 posts ] 
more than 4 controllers on a sensor port? 
Author Message

Joined: Fri Mar 11, 2011 9:30 pm
Posts: 12
Post more than 4 controllers on a sensor port?
How many TETRIX controllers can you control from a single NXT sensor port? The ROBOTC motor and servo configurator appears to support 4 per port. Is that a technical limit of the controllers and the NXT? Or is that limit a result of the configurator or some aspect of robotc?

Is it possible to use 5 TETRIX controllers off of a single sensor port?

Jamie Diamond
Cougar Robotics Team (Ring It Up!, Bowled Over!, Get Over It! #4251)
(Smart Moves #127, Climate Connections #437, Power Puzzle #1470)

Tue Nov 27, 2012 11:18 am
Site Admin
Site Admin

Joined: Thu May 24, 2012 12:15 pm
Posts: 722
Post Re: more than 4 controllers on a sensor port?
Natively ROBOTC only supports daisy-chaining of up to 4 Motor or Servo Controllers on a single port. If you wish to use more than 4 per port, I would suggest contacting the manufacturer of the Motor and Servo Controllers, HiTechnic ( to see if this is possible.

You can write your own I2C drivers in ROBOTC, so if you are able to connect more than 4 devices to a port you should be able to code it using custom I2C calls; again, I would suggest contacting HiTechnic to see what they recommend first.

Check out our Blog! And our Facebook page!
Need help? Take a look at our updated help documentation and the ROBOTC Forums.

Tue Nov 27, 2012 12:50 pm

Joined: Wed Jul 21, 2010 11:23 pm
Posts: 39
Post Re: more than 4 controllers on a sensor port?
How about attaching that 5th controller to a sensor mux port? Seems like that might be do'able if you write your own I2C code, and it would avoid having to dedicate a second NXT sensor port exclusively for controller(s).

Thu Nov 29, 2012 11:14 pm
User avatar

Joined: Sun Nov 15, 2009 5:46 am
Posts: 1523
Post Re: more than 4 controllers on a sensor port?
No, my understanding is that Sensor MUX is for sensors only (i.e. can only read, not write). So there is no way you can connect a motor controller to it because I would imagine you must have to write the motor value to it.

Fri Nov 30, 2012 1:56 am
Display posts from previous:  Sort by  
Reply to topic   [ 4 posts ] 

Who is online

Users browsing this forum: No registered users and 2 guests

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group.
Designed by ST Software for PTF.