[TriEmbed] Pinewood derby help

[Pete Soper]

The microcontroller can't possibly start the motor, even if a diode is 
used to snub the back EMF. Use a FET setup like this:

   https://i.stack.imgur.com/qTvCf.png

-Pete



On 01/07/2017 09:37 PM, Craig Cook via TriEmbed wrote:
> At my cub pack we have a "Dad's race" the night before the boys race.  
> Dads don't have to comply to the same rules the boys do.  i.e. if we 
> can get a motor on the car and it weighs more than 5oz, thats fine.  
> Purely for engineering fun.
>
> I have a donor RC dump truck I am going to take the motor and axel out 
> of.  I have a NTC CHIP I was going to strap on to control the motor.
>
> I've got the kernel upgraded to 4.4 and PWM working.
>
> Am I correct in thinking if I can hook up the motor to the CHIP board 
> I could use PWM to "slow" it down? i.e. if I let the motor spin at 
> full speed the derby car wheels may just sit and spin.  If I can send 
> the right amount of pulses I should be able to control the motor speed.
>
> The dump truck was powered by 3 x AA batteries, which makes me believe 
> the motor accepts 5V or less, so using the CHIP should not fry it.  
> The motor has a 1 ohm resistor attached and a capacitor with 104 
> written on it.
>
> I'm ready to attach the motor to the CHIP, any reason I shouldn't and 
> see what happens?
>
> Thanks
>
> Craig
>
>
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