[simpits-chat] Altimeter Question

[John Miguez]

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.  

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.  :)

John
  ----- Original Message ----- 
  From: Ben Jones 
  To: Non-tech or other tech related messages for Simpits 
  Sent: Tuesday, November 04, 2003 3:16 AM
  Subject: Re: [simpits-chat] Altimeter Question


  Brian,

  i dont know alot about the basic 2 paralax stamp , to start telling you yes or no you can /cant do it

  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 "

  so if this is correct  popping a charge via relay shouldnt be a problem in theory

  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,

  as for modifying ya code  i might have to be solved buy a guru programmer(s) on the list

  regards

  ben
  bjones at pipecomp.com.au


    ----- Original Message ----- 
    From: Brian Sikkema 
    To: simpits chat 
    Sent: Tuesday, November 04, 2003 6:37 AM
    Subject: [simpits-chat] Altimeter Question


    Hey Guys,

    I've got a question, not about an aircraft altimeter, but one I'm thinking of building for model rocket use.

    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:

    http://www.rocket-roar.com/rap/alt.html

    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 ;) 

    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! :)

    If we can modify this circuit, it could be used for all sorts of useful things, including staging. My mouth waters with the possibilities! :)

    Brian


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