[simpits-chat] Altimeter Question

Ben Jones bjones at pipecomp.com.au
Tue Nov 4 18:01:34 PST 2003

after actually looking at the code and schematic i think it is possible,

actually after looking at the code most/all of the code is outputs to the "eeprom  ic"   except for the serial link and led  side of things

in the code
out12=0	' LED off
out12 = 1 	' LED on 

they are using output 12 as the led switch for on/off state
and output 11 for something to do with clearing or readying the adc chip for either data dump or accept

NOW bear with me on comes theory mode

if  the have a led hooked up as a output , why couldnt a small relay (solid state) be hooked up to the basic stamp 2  via a transistor off one of the output legs if the board will support this ,   this is where my limited electronic experience will start me banning my head against the wall, 
i know transistors are currrent driven for activiation maybee if a solid state relay is used hooked up to this transistors emiters leg this might be enough if matched correctly to get the solid stare relay to change states , and switch   a separate supply to trip your   "chute popper"

i will at this point hand the thread over to anyone who has any electronic engineering experience  to either expand on my rambellings  of just trash the shit out of my idea ..hehe

hope this helps

bjones at pipecomp.com.au

  ----- Original Message ----- 
  From: Ben Jones 
  To: Non-tech or other tech related messages for Simpits 
  Sent: Tuesday, November 04, 2003 5:16 PM
  Subject: Re: [simpits-chat] Altimeter Question


  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


  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:


    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! :)



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