[TriEmbed] Pinewood derby help

[Carl Nobile]

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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