[TriEmbed] Pinewood derby help

[Craig Cook]

Ah, that probably explains another project I saw.  It had a CHIP, motor and IRF510N MOSFET.
I have some MOSFET's on order.  I'll wait for them and then try to drive my motor.
Oh, exactly what Pete just said.

Thanks
Craig

      From: Carl Nobile <carl.nobile at gmail.com>
 To: Craig Cook <cncook001 at yahoo.com> 
Cc: TriEmbed <triembed at triembed.org>
 Sent: Saturday, January 7, 2017 10:35 PM
 Subject: Re: [TriEmbed] Pinewood derby help
   
Craig,
You'll need some sort of optical isolator between the motor and any electronics or the reverse EMF from the motor will fry the electronics.
It's late as I send this, so I won't go into detail. Google it.
Carl


On Jan 7, 2017 9:38 PM, "Craig Cook via TriEmbed" <triembed at triembed.org> 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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