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<DIV><FONT color=#000080 size=2>Hee hee, you younglings need an old fart to tell
you about TTL. Except, I am having a senior moment and can't remember what
the first "T" means. The other two letters are Transistor Logic.
</FONT></DIV>
<DIV><FONT color=#000080 size=2></FONT> </DIV>
<DIV><FONT color=#000080 size=2>Transistors came out when I was a kid.
They are these tiny replacements for the vacuum tube that helped put a man on
the moon. :)</FONT></DIV>
<DIV><FONT color=#000080 size=2></FONT> </DIV>
<DIV><FONT color=#000080 size=2>John</FONT></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000080 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=bjones@pipecomp.com.au href="mailto:bjones@pipecomp.com.au">Ben
Jones</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=simpits-chat@simpits.org
href="mailto:simpits-chat@simpits.org">Non-tech or other tech related messages
for Simpits</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, November 04, 2003 3:16
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [simpits-chat] Altimeter
Question</DIV>
<DIV><BR></DIV>
<DIV><FONT size=2>Brian,</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>i dont know alot about the basic 2 paralax stamp , to start
telling you yes or no you can /cant do it</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>but from the wright up in a electronic catalogue i
have it is noted that the stamp 2 can be connected to " push buttons,
led's ,and other TTL level devices, and with extra components to non-TTL
devices such as relays "</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>so if this is correct popping a charge via relay
shouldnt be a problem in theory</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>the other thought i have is what the F*** is a TTL device ,
i have never heard of these in all of my electrical studies .... but hey
i get told all the time i always have my head up my ass ... hehe,</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>as for modifying ya code i might have to be solved buy
a guru programmer(s) on the list</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2>regards</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2>ben</FONT></DIV>
<DIV><FONT size=2><A
href="mailto:bjones@pipecomp.com.au">bjones@pipecomp.com.au</A></FONT></DIV>
<DIV> </DIV>
<DIV> </DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=hangr18@hotmail.com href="mailto:hangr18@hotmail.com">Brian
Sikkema</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=simpits-chat@simpits.org
href="mailto:simpits-chat@simpits.org">simpits chat</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, November 04, 2003 6:37
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [simpits-chat] Altimeter
Question</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>Hey Guys,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I've got a question, not about an aircraft
altimeter, but one I'm thinking of building for model rocket
use.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>For those of you into the hobby, you know that
even the most basic altimeter good for data logging and, most importantly to
me, ejection charge timing, can be very expensive (cheapest I've found to do
what I need is about $120). But I've found what seems to be a very nice
setup online, here:</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2><A
href="http://www.rocket-roar.com/rap/alt.html">http://www.rocket-roar.com/rap/alt.html</A></FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I'm confident I could build this altimeter and
get it working, I know enough to do that, but I'm not quite experienced
enough to modify it to what I need it to do (blow an ejection charge). This
setup is just a data-logger. What I need is for it to trip a relay at some
pre-specified altitude or time after apogee which would blow the ejection
charge. This is pretty important, because the launchsite we use up here is
very narrow, flanked by a dense forrest on one side and Lake Superior on the
other. It's nice and long, but if you drift to the side you're screwed! I
lost two rockets to the trees on our last launch, and I would have lost my
prized V2 to the Lake had the parachutes not come off on the last flight
(thats a funny story in and of itself - I'll tell it later ;) </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>So anyway, long story short, anyone here have
experience with PICs and whatnot, who could take a look at the circuit and
code and give me some ideas on modding it to trip a relay? I'd be VERY
appreciative! :)</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>If we can modify this circuit, it could be used
for all sorts of useful things, including staging. My mouth waters with the
possibilities! :)</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Brian</FONT></DIV>
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