NXT motor port wiring

[h-g-t]

I have a project where I have two motors close together which need cables longer than the standard items, i.e 12 wires.

Since two of the wires on each port are earthed, would it be possible to use only five wires and only split the earth wires apart at each end?

To carry this even further, could the 4.3v & 9v supplies also be combined?

This would then only require four I2C cables, one earth cable, one 4.3v & one 9v cable; a total of seven wires instead of twelve in one sheath.

Much neater but is this feasible?

[mattallen37]

You could share the 4.7v supply, as well as the ground (pins 4 and 3). The rest all need to be individual. Unless, if you don't need encoders, then you only need to use 4 wires total (both sets of 1 and 2).

What does this have to do with I2C?

Edit: Only one of the wires is ground (3).

[h-g-t]

[mattallen37]

That is right for the sensor ports (although the RS-485 stuff only applies to port 4), but not the motor ports.

[mattallen37]

Take a look at the .jpg picture in the attached zip.

Lego NXT motor port pinout.zip

(39.5 KiB) Downloaded 263 times

[h-g-t]

OK,thanks.