<html>
<head>
<meta content="text/html; charset=windows-1252"
http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
<p>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:<br>
</p>
<p> <a class="moz-txt-link-freetext" href="https://i.stack.imgur.com/qTvCf.png">https://i.stack.imgur.com/qTvCf.png</a></p>
-Pete
<p><br>
</p>
<br>
<div class="moz-cite-prefix">On 01/07/2017 09:37 PM, Craig Cook via
TriEmbed wrote:<br>
</div>
<blockquote
cite="mid:1940118862.424594.1483843059060@mail.yahoo.com"
type="cite">
<div style="color:#000; background-color:#fff;
font-family:HelveticaNeue-Light, Helvetica Neue Light, Helvetica
Neue, Helvetica, Arial, Lucida Grande,
sans-serif;font-size:16px">
<div id="yui_3_16_0_ym19_1_1483239526576_552932">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.</div>
<div id="yui_3_16_0_ym19_1_1483239526576_553058"><br>
</div>
<div dir="ltr" id="yui_3_16_0_ym19_1_1483239526576_553056">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.</div>
<div dir="ltr" id="yui_3_16_0_ym19_1_1483239526576_553063"><br>
</div>
<div dir="ltr" id="yui_3_16_0_ym19_1_1483239526576_553126">I've
got the kernel upgraded to 4.4 and PWM working.</div>
<div dir="ltr" id="yui_3_16_0_ym19_1_1483239526576_553132"><br>
</div>
<div dir="ltr" id="yui_3_16_0_ym19_1_1483239526576_553134">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.<br>
</div>
<div dir="ltr" id="yui_3_16_0_ym19_1_1483239526576_553168"><br>
</div>
<div dir="ltr" id="yui_3_16_0_ym19_1_1483239526576_553170">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.</div>
<div dir="ltr" id="yui_3_16_0_ym19_1_1483239526576_553295"><br>
</div>
<div dir="ltr" id="yui_3_16_0_ym19_1_1483239526576_553305">I'm
ready to attach the motor to the CHIP, any reason I shouldn't
and see what happens?<br>
</div>
<div dir="ltr" id="yui_3_16_0_ym19_1_1483239526576_553230"><br>
</div>
<div dir="ltr" id="yui_3_16_0_ym19_1_1483239526576_553229">Thanks</div>
<div dir="ltr" id="yui_3_16_0_ym19_1_1483239526576_553238"><br>
</div>
<div dir="ltr" id="yui_3_16_0_ym19_1_1483239526576_553239">Craig<br>
</div>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
Triangle, NC Embedded Computing mailing list
<a class="moz-txt-link-abbreviated" href="mailto:TriEmbed@triembed.org">TriEmbed@triembed.org</a>
<a class="moz-txt-link-freetext" href="http://mail.triembed.org/mailman/listinfo/triembed_triembed.org">http://mail.triembed.org/mailman/listinfo/triembed_triembed.org</a>
TriEmbed web site: <a class="moz-txt-link-freetext" href="http://TriEmbed.org">http://TriEmbed.org</a>
</pre>
</blockquote>
<br>
</body>
</html>