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General Category => Magic Pie & Smart Pie Discussions => Topic started by: Ijmccubbin on April 26, 2014, 08:34:07 AM

Title: MPIII Throttle control
Post by: Ijmccubbin on April 26, 2014, 08:34:07 AM

Hi all,

I am using two MPIII front motors to drive a modified "Segway".  Thumb throttles are fine for now but I was going intending to add some more personalized control features using my own signals.

My main concern is throttle control.  If I inject a signal up from the throttle pin to ground, I get no output from the motor.  When I hook the thumb throttles back up, everything works fine.

Does anyone know the signal range or has anyone tried to control the mpIIIs throttle/brake/reverse using something other than twist/thumb throttles?

Any help would be greatly appreciated

Title: Re: MPIII Throttle control
Post by: Bikemad on April 27, 2014, 11:25:38 PM

Hi and(https://i.imgur.com/evDSMvT.png)to the forum.

The throttle control is achieved by using a variable signal voltage of between 0.8V and 4.5V.
(Motor starts at ~1.25V and Maximum power is reached at ~3.25V)

The GM throttle uses a hall sensor to vary the voltage according to the actual throttle position, but a 10k potentiometer (variable resistor) should also provide variable throttle control.

The Brake, Cruise and Reverse functions simply use a switch to ground out the respective signal wire to operate the required function.

Alan
 

Title: Re: MPIII Throttle control
Post by: Morgen 3Eman on April 28, 2014, 12:48:09 AM

Ensure you have the polarity right.  neg to ground, pos (signal) to throttle pin.

TTFN,
Dennis

Title: Re: MPIII Throttle control
Post by: Ijmccubbin on May 20, 2014, 09:28:15 PM

Thanks gentlemen,  I will be attempting to perform the testing tomorrow.