<html>
<head>
<meta content="text/html; charset=windows-1252"
http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
Just to be clear, are you refering to Shape Memory wire or nitinol
(nickel titanium)?<br>
The 555/556 will do the trick for very fixed motion, but you need
multiple, one for the heatup, one for the cool down cycles, but in
general, using something with smarts would be better. In this case,
pulse width modulation (PWM) is the way to go, excellant control and
ramping of heating/cooling cycles under control. The Arduino's have
some (physically) smaller cousins that use the Arduino IDE, etc if
you are familiar with that. Otherwise, Microchip makes some
excellant 6 pin (10F and 12F series) processors that have on board
PWM with free compilers, etc, giving a very small footprint, smaller
even then the 555.<br>
<br>
If you really want/need to do it without smarts, you could even do
it very old school with a astable multivibrator using transistors,
but the footprint would be likely be larger than the 555 and it's
associatted bits.<br>
<div class="moz-cite-prefix"><br>
Ken<br>
<br>
On 2015-03-25 2:19 PM, Molly Mask wrote:<br>
</div>
<blockquote
cite="mid:CA+8cXDxuFpt62QB_9+oujidcgFcew_rb3MYU7vcf4AYwU_t3yQ@mail.gmail.com"
type="cite">
<div dir="ltr">Hi, I'm a part of an electronic media art class at
Uottawa and I'm working on a project right now that involves
memory wire. I'm looking for a fairly compact/simple way to
control a power source to the wire without the use of an
arduino. I've looked into using a battery power source for the
voltage I need to activate the wire, but what I need is a timer
solution that will allow me to control the activation of the
wire to allow it to grow and contract and to not burn the wire
out. So far I have looked at using a time delay relay and a
555timer. The 555timer seems most promising-- Is there anything
else I should be aware of or look into before going down this
route? <br>
<br>
Thanks<br>
<br>
Molly </div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
Lab mailing list
1. subscribe <a class="moz-txt-link-freetext" href="http://artengine.ca/mailman/listinfo/lab">http://artengine.ca/mailman/listinfo/lab</a>
2. then email <a class="moz-txt-link-abbreviated" href="mailto:Lab@artengine.ca">Lab@artengine.ca</a> to send your message to the list</pre>
</blockquote>
<br>
</body>
</html>