|Sep 08, 2011, 02:23 PM|
New Project - An Opto-isolated Kill Switch
I'm thinking about starting a new PIC project, an opto-isolated kill switch for use with CDI-equipped gas engines. I know there are several RTF units on the market, but I'd like to build my own. I learn a lot by stumbling my way through the programming.
I'm planning to use a 12F675/629, and I'd like to hear from the experts here about what features you think should be included, and maybe some things I should be careful of. And of course, I'm sure I'll need some help with everything from the circuit design to programming. Here's my list of features so far:
One of my first questions is this: how long should the program look for a signal before deciding that there's a problem and killling the ignition? I don't want it to be too sensitive and mistake a slight glitch as a loss of signal.
Any other input would be great. And feel free to sling some code at me if you just get a "hankering". (Let's see Alain translate THAT word! )
|Sep 09, 2011, 11:53 AM|
Also the code logic might shut down the engine for 'X' number of missing frames, excessive changes (say a frame is more than 20% different from the previous frame) and a condition that allows for restarting the CDI if a short time passes (a second or so) and then good frames are re-established, but once a limit was crossed with bad or missing frames (say several more seconds) the shutdown would be 'latched' and stay in place until a reset (cycle remote power) condition occurred.
|Sep 09, 2011, 02:41 PM|
I could use pre-set delays, like maybe .25, .50, and .075 seconds, and have the program jump to a different variable depending on how many times the switch is pressed after it enters the programming mode.
The only thing I'm not sure about would be the idea of allowing the engine's CDI to be re-started. I'd be afraid that as it freewheeled it might flood the cylinder, maybe cause it to backfire and possibly start running backwards. That would be an interesting development, to put it mildly. I'll have to ponder that idea a bit.
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