I'm trying to use the Mindsensors's Motor Multiplexer, but I'm not sure how to connect it to the NXT?

So far, I have connected the MMX (port NXT) to the NXT (port S1), connected the green thing on it to a 9 volt battery (can I use this or do I have to use a 6-AA Battery Holder with NXT Mounts?), port M1 to a lego Interactive Servo Motor , and port M2 to a converter cable to a PF extension wire to a LEGO® Power Functions M-Motor.

This is the code I am using, but it doesn't seem to work?

///////////////////////////////////////////////////////////////////////////////////////////////////
// Simple testprogram to show the functionality of the Mindsensors NXTMMX interface in RobotC
// The interface/driver is based on the NXC interface written by Deepak Patil for easy migration
//
// Written by Rudolf Lapie
// 26 APRIL 2010
///////////////////////////////////////////////////////////////////////////////////////////////////

// The driver routines for the Mindsensors Multiplxer
#include "NXTMMX-lib.h"

// MAIN TASK : endless loop displaying the values of the PowerMeter
task main ()
{
eraseDisplay() ;
nxtDisplayCenteredBigTextLine (2, "1 NXT");
nxtDisplayCenteredBigTextLine (4, "5 MOTORS") ;
wait10Msec(400) ;

// Configure port S1 to be a low speed I2C sensor.
SetSensorType(S1, sensorLowSpeed);

// Initialize the NXT MMX
MMX_Init(S1, MMX_ADDRESS, 0) ;

motor[motorA] = MMX_Speed_Full ;
eraseDisplay() ;
nxtDisplayCenteredBigTextLine (2, "MOTOR");
nxtDisplayCenteredBigTextLine (4, "A") ;
wait10Msec(400) ;

motor[motorB] = MMX_Speed_Full ;
eraseDisplay() ;
nxtDisplayCenteredBigTextLine (2, "MOTOR");
nxtDisplayCenteredBigTextLine (4, "AB") ;
wait10Msec(400) ;

motor[motorC] = MMX_Speed_Full ;
eraseDisplay() ;
nxtDisplayCenteredBigTextLine (2, "MOTOR");
nxtDisplayCenteredBigTextLine (4, "ABC") ;
wait10Msec(400) ;

MMX_Run_Unlimited( S1, MMX_ADDRESS, MMX_Motor_1, MMX_Direction_Forward, MMX_Speed_Full) ;
eraseDisplay() ;
nxtDisplayCenteredBigTextLine (2, "MOTOR");
nxtDisplayCenteredBigTextLine (4, "ABC1") ;
wait10Msec(400) ;

MMX_Run_Unlimited( S1, MMX_ADDRESS, MMX_Motor_2, MMX_Direction_Forward, MMX_Speed_Full) ;
eraseDisplay() ;
nxtDisplayCenteredBigTextLine (2, "MOTOR");
nxtDisplayCenteredBigTextLine (4, "ABC12") ;
wait10Msec(400) ;

MMX_Stop( S1, MMX_ADDRESS, MMX_Motor_2, MMX_Next_Action_Brake );
eraseDisplay() ;
nxtDisplayCenteredBigTextLine (2, "MOTOR");
nxtDisplayCenteredBigTextLine (4, "ABC1") ;
wait10Msec(400) ;

MMX_Stop( S1, MMX_ADDRESS, MMX_Motor_1, MMX_Next_Action_Brake );
eraseDisplay() ;
nxtDisplayCenteredBigTextLine (2, "MOTOR");
nxtDisplayCenteredBigTextLine (4, "ABC") ;
wait10Msec(400) ;

motor[motorC] = 0 ;
eraseDisplay() ;
nxtDisplayCenteredBigTextLine (2, "MOTOR");
nxtDisplayCenteredBigTextLine (4, "AB") ;
wait10Msec(400) ;

motor[motorB] = 0 ;
eraseDisplay() ;
nxtDisplayCenteredBigTextLine (2, "MOTOR");
nxtDisplayCenteredBigTextLine (4, "A") ;
wait10Msec(400) ;

motor[motorA] = 0 ;
eraseDisplay() ;
nxtDisplayCenteredBigTextLine (1, "NXT>ABC") ;
nxtDisplayCenteredBigTextLine (3, "MMX>12") ;
nxtDisplayCenteredTextLine (5, "by MindSensors") ;

wait10Msec(400) ;

wait10Msec(2000) ;

}

///////////////////////////////////////////////////////////////////////////////////////////////////
// THAT's ALL, FOLKS !
///////////////////////////////////////////////////////////////////////////////////////////////////


Does anyone have a picture on how to do all the connections, if a 9 volt battery will suffice, and what code i should use (I downloaded NXTMMX-lib.h and there are no errors when compiling)?

Is the polarity of the battery connected right? A 9V block battery will not last very long. I would try to find an alternative, if I were you. I use a PF battery pack (6xAA) with a home made adapter cable for it to the MMX.

- Xander

I have a pf battery pack. How would I make this homemade adapter cable for the mmx?

I took a normal PF extension cable and snipped it in half. You can find out which pin carries what here: http://www.philohome.com/pf/pf.htm in the "Power Functions working" section. I then soldered a black and red one onto the right PF wires:

These are "breadboard wires". They have a stiff, solid wire end to them which makes soldering onto them easy and also stay in the green connector on the MMX very nicely.
I used some simple heat shrink sleeving on the part where there PF wire and these wires meet. You can use electrical tape, too, if you prefer.

Regards,
Xander

Is there a way to just test the motors working through the mmx without soddering anything (hopefully using a 9volt batter)?

Well, if you can figure out how to power it with with a 9V battery, sure

- Xander