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1st generation AUTO cancel TSCU "banging the bits"

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My thought's were to measure the switches bounce and use that to set the software delay. That or sample the switches state 10ms (?) later to determine if it's sufficiently settled.

I'd rather plan ahead for all possibilities if I can. ;)

Thinking of an RC circuit to the BS170's gate as well. But as Ed likes to say, to measure is to know. Gotta see what's on the lines first.
 
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I hope that works Dale. Remember though it can only operate within the supply it's connected to. If I remember the characteristics of the noise I saw was full scale (ie 12v or close to it) high Q and high frequency. I had to put a second order low pass filter on each input signal and then I was able to software debounce the output of that.

Fun ain't it :D
 
Martin, 1.5 great minds think alike. 1.499 yours and .001 mine.

On my way home from work tonight I was thinking about the possibility of having to add a low pass filter to the inputs. You know one other thing I been pondering for the past week or so? Robert Barr used LM7805's to down convert the voltage from the turn signal switch's to the 5 V necessary to feed the input of the 14M2 he was using.

Now why isn't he having issues with false triggering from the coils field collapsing?

http://www.cycleorings.com/piglet/picaxe tcu.JPG
 
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rustybronco said:
.... having issues with false triggering from the coils field collapsing?
Click to expand...

La_Forge_fights_booby_trap.jpg


We're in $hit capt'n!
 
Wallowgreen said:
I hope that works Dale. Remember though it can only operate within the supply it's connected to. If I remember the characteristics of the noise I saw was full scale (ie 12v or close to it) high Q and high frequency. I had to put a second order low pass filter on each input signal and then I was able to software debounce the output of that.

Fun ain't it :D
Click to expand...

Was that power supply noise? I have measured about 250 milli-v rmswith noise synced to the rpm ( mostly from the r/r chopping ac).

Hate to ask but did you have adequate filtering on the regulator? Low ESR?

I know that switches can bounce, and debounce would be effective to a point. The other way is acomplish the same thing as a RC LPF without any parts is treat the inputs as analog and digitally LPF.

Still need a series current limit but that is it. Throw a cap on if nessesarily but just more parts.
 
posplayr said:
Was that power supply noise?
Click to expand...

No, it's coupled noise on the input lines from the switching at the coils. The wiring from the switch runs right between them. These days the input to whatever you try to detect a switch activation with ends up being low voltage at some point. It's a job to differentiate between what you do want to detect and the noise that's present all the time on the input signals.
 
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Wallowgreen said:
No, it's coupled noise on the input lines from the switching at the coils. The wiring from the switch runs right between them. These days the input to whatever you try to detect a switch activation with ends up being low voltage at some point. It's a job to differentiate between what you do want to detect and the noise that's present all the time on the input signals.
Click to expand...

I guess you don't have a scope trace? From what you describe I'm gathering it is something like:

when the switch is off you see a low duty cycle signal between 0-12v and when the switch in on it is a high duty cycle signal again 0-12v where no false period is longer than say 10 msec?

That being the case I would want to detect duty cycle ( an average time varying quantity). Basically counting up and down cycles over a finite sliding window.

You can do that by analog integration with a low frequency pole (a few Hz) and operate on the minus 1 slope ( you said you did a second order filter which would be a double integration ). I would tend to want to do that by performing an averaging in software. So you clamp/current limit the voltage input to the 12v range mainly to protect the controller, and now detect duty cycle . No debounce required.
 
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Griffyn said:
I had a note cross the local hackerspace mailing list about a guy doing small-batch circuitboards online at circuitboards.com

If enough people are interested in (and can agree upon) a board solution, apparently you can get that guys to make you a few. I havn't checked out his site yet, so proceed with caution.
Click to expand...
I have used ExpressPCB for some of my projects, and I like it. They have a design program that is not all that hard to use, then you submit the drawing to them, you have boards back in just a few days.
icon_thumbsup.gif


rustybronco said:
I wouldn't go betting the farm on it! :eek:
Click to expand...
It's just a small farm, why not? :-k

Antfarm.jpg

.
 
Updated the first post with an 'almost' finalized design and description of how it is intended to work.
 
They are prone to failures...which is why he was doing the reworking with modern parts.
 
what's going on here?
i have one of these cigarette pack size metal boxes.
i'm sure it works as it was removed when the bike was only 10 years old...hmmmmm
good...no good...???? lol
 
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