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more than 4 controllers on a sensor port?
http://robotc.net/forums/viewtopic.php?f=52&t=5175
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Author:  JamieD [ Tue Nov 27, 2012 11:18 am ]
Post subject:  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?

Author:  JohnWatson [ Tue Nov 27, 2012 12:50 pm ]
Post subject:  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 (http://www.hitechnic.com/contact) 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.

Author:  ronmcrae [ Thu Nov 29, 2012 11:14 pm ]
Post subject:  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).

Author:  MHTS [ Fri Nov 30, 2012 1:56 am ]
Post subject:  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.

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