[TriEmbed] IR sensor vs trigger

[Joe Fair]

I think you are right, they kind of each need a chip.  I was hoping to be
smart enough to not to need more hardware.
Does the tiny sport two interrupts?  Or maybe i can tie them together?

I guess i need to learn more about days sheets, too.
Joe
On Jul 30, 2014 10:09 PM, "Jon Wolfe" <jonjwolfe at yahoo.com> wrote:

> I agree with the others, it sounds like the trigger should get the
> interrupt.
>
> Like Jeff said, you want your interrupt to execute in as short of a time
> as possible. One approach might be to just set a flag on trigger presses
> then process the action in the main loop. That could still leave you with 1
> sec latency if you are detecting IR hits, which would probably be pretty
> noticeable.
>
> I have never tried this on a tiny, but I'm making it a personal mission to
> find a use case for it, but you could use an RTOS, like
> http://www.femtoos.org/  Looks promising. I've used ChibiOS on Cortex
> M3/4's and found it pretty nice to work with, YMMV.
>
> The other alternative approaches might be to try to reduce the 1 second
> detection loop. Or, to try to architect your own "cooperative multitasking"
> or coroutines. In short, write your detect loop so that instead of looping
> for 1 second, it just does a little bit of work and returns to the main
> loop, remembering where is was in the loop between each call. I use this
> approach a lot.
>
> I will say that you should try to handle debouncing the trigger in
> hardware as much as you can. I've tried software debouncing mechanical
> encoders in interrupt driven routines, and I can attest that it is
> maddening.
>
> Lastly, you *could* always just buy a separate tiny for the detection, but
> I have no ulterior motive or bias there ;)
>
>
>
>
>   ------------------------------
>  *From:* Joe Fair <joe at fairanswers.com>
> *To:* triembed at triembed.org
> *Sent:* Saturday, July 26, 2014 4:09 PM
> *Subject:* [TriEmbed] IR sensor vs trigger
>
> Ok.  I'm pretty close on getting my home made laser tag with at tiny 85s
> going, but now i have a question about design.
> The loop I'm using detects a trigger pull, then a hit on the sensors.
> however, The pulse in function I'm using to sense IR ha a timeout of 1
> second.  If there is no inbound signal it is only checking got a trigger
> pull once a second.
> So i need to use an interrupt, but does it matter if i use one on the
> trigger pull or the ir sensor?
> Joe
>
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