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Thread: button shifters

  1. #11
    Yeah, I'm liking the ITW Switches... I just bought a couple. Series 49-59. Pretty nice switches and they're completely closed. Got 'em through Newark at a pretty good price too. Thanks for the suggestion!

    Sean
    Sean
    University of Guelph

    Discovery consists of seeing what everybody has seen and thinking what nobody has thought.
    Albert von Szent-Gyorgyi

  2. #12
    Nope, that's why I asked, I said they looked over priced, then again a Kia Magentis also looks like it costs a lot, I was just asking.

    I might have had the wrong data sheet, I was trying to figure out why the hall effect, but I'm sure there's a reason (some crazy military harsh enviro spec ...)

    Because push button shifting is cool, and that's the only reason I can think of any team going to all these lengths.

    FYI MC14490 -- 7$CDN, debouces nicely (hope she hold together)

    Thanks for the tip, I'll see if I can get some samples, would be cool to play with regardless. But I did like the suggestion of a junk yard ... also I was thinking, go to a Benz dealership or some high end dealership, find some nice buttons in the car, and then see if you can get the parts at Cost ... might work, gonna see what Honda has in their fancy dancy cars tomorrow since we have employee pricing.

    Fun fun this 'tiptronic' stuff, gives the electricals something to do.

    Originally posted by Chris Boyden:
    Hey man, you get what you pay for. Did you
    even bother to price them out??
    But, if you are worried about cost
    try the sample button. And if you're that
    worried about cost, why are you
    doing push button shifting?
    What's all this talk about hall effect sensors?
    I think you're looking at the wrong datasheet.
    series 59 is what we used.
    you were looking at 49.
    On the plus side, hall effect switches probably don't need to be debounced, but code is cheap, and parts are not.
    UNB FSAE - Weally, weally fast !!!

  3. #13
    FYI MC14490 -- 7$CDN, debouces nicely (hope she hold together)
    Do you use debouncing on your shifter? Does your ECU take car of the shift control (ignition kill, etc..) or did you build a separate circuit for the shifter?
    Devin Weston
    Oregon State FSAE
    Engine Team '04-'06

  4. #14
    We're using pretty plain tact switches not even momentary with a 20ms debounce and have no shift issues button related or other.

    A seperate circuit takes the ignition signal from the ecu does what it needs to do, and outputs to the power transistors.
    Martin Raska
    UBC FSAE 2003-2007
    www.formulaubc.com

  5. #15
    Currently everything is modular, the shifter, and ign kill are togethere. We haven't purchased our ECU yet, so hopefully when it comes we'll just use it to tune the mixture, and we'll handle the ign kill.

    And yes, for now just tacticle switches running through a debouncer, still all table top stuff, nothing mounted as of yet, that's why I was curious about the fancy dancy buttons.

    Originally posted by osubeaver:
    <BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">FYI MC14490 -- 7$CDN, debouces nicely (hope she hold together)
    Do you use debouncing on your shifter? Does your ECU take car of the shift control (ignition kill, etc..) or did you build a separate circuit for the shifter? </div></BLOCKQUOTE>
    UNB FSAE - Weally, weally fast !!!

  6. #16
    Sean,

    Glad you like the switches....
    I just wish ITW made a sealed toggle/rocker switch for the ignition switch. But, we'll probably go with a sealed toggle from del-city with rubber boot.

    Hall effect switches are solid state devices that don't have contact erosion problems and should last forever. ie.10 million cycles
    UNM FSAE 2003 to 2005

  7. #17
    Originally posted by EgyptianMagician:
    Currently everything is modular, the shifter, and ign kill are togethere. We haven't purchased our ECU yet, so hopefully when it comes we'll just use it to tune the mixture, and we'll handle the ign kill.
    ign kill was simple with our motec, just another input. i would say its worth selecting your ECU before bothering making an external ign kill.
    - ARC '04 member (now retired ) - Bling Bling Competition winners FSAE-A '04 (and design winners)

  8. #18
    Originally posted by gug:
    <BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by EgyptianMagician:
    Currently everything is modular, the shifter, and ign kill are togethere. We haven't purchased our ECU yet, so hopefully when it comes we'll just use it to tune the mixture, and we'll handle the ign kill.
    ign kill was simple with our motec, just another input. i would say its worth selecting your ECU before bothering making an external ign
    kill. </div></BLOCKQUOTE>

    Probably a good idea, but I'd have to ask "what does it do other than kill the ignition for a specific amount of time" ... And then of course there is cost. If it's cheaper to buy the whole pacakge, then maybe we'll do just that, unless we see room for improvement. I myself would prefer to build it from scratch using the Megasquirt as a base concept and building from there, but we shall see.

    As I mentioned, the "prototype" control board is using a simple transistor input with a TVS to handle any strange spikes that could fry the transistor. Go in on Vcc and take the voltage from Vc, switch the base from the micro. I guess we'll soon see what happens.
    UNB FSAE - Weally, weally fast !!!

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