[CART360] Fwd: CART 360 _question

[Vincent Leclerc]

As you may recall, I showed you how to drive inductive loads in class.
http://hybrid.concordia.ca/~cart360_vincent/studio/04/<http://hybrid.concordia.ca/%7Ecart360_vincent/studio/04/>

Basically, you drive electromagnets just like you drive DC motors.

In general, I'd advise you use a wall-mount power supply rather than a
battery for this type of project. You'll get much stronger magnetic fields
with higher current sources (batteries typically can't provide much
current).

Vincent

PS. Don't forget the magic capacitor...


On Tue, Oct 27, 2009 at 8:46 PM, joN <jonnygexter at gmail.com> wrote:

> Hello.
>
> For design brief #3, our group made electromagnets by wrapping wire around
> a giant nail to make a coil. We want to use the Arduino to control turning
> them on and off, but before testing this we want to be sure we won't fry the
> Arduino. We read online that there will be kickback when turning off the
> electromagnet, and we think we need either a diode or a capacitor (or both?)
> but are not sure about that or how to hook it up.  If I were to guess, I
> would say putting a diode at the digital out pin and before the
> electromagnet should be good.
>
> Also, testing with a 9V battery as the power source caused the battery to
> heat up super hot and super fast. Using a 1.5V AA battery seemed to be OK.
> Is there anything we need to worry about if we use the Arduino's digital out
> pins as the power source?
>
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