56935Re: Headbot circuit for IR
- Nov 4, 2007I was going to use the guts from an old computer mouse to encode the
position of the head bot.
--- In email@example.com, "Joseph Charles" <jodicalhon@...> wrote:
> Sorry, Joshua, I don't know of any ready-made solutions.
> If I follow you correctly, you will have two sets of band-pass
> filters in your head, one tuned to each frequency, and a 1 of 2 mux.
> First find the 2.kHz signal, note the heading, mux in the other
> filter, find the 4kHz signal, note the heading, and calculate your
> Sort of like having two heads, each tuned to a separate frequency.
> I still think that Wilf's idea of amplitude modulating the
> beacons is your best bet. You could try FM as an alternative.
> Whatever you use for a detector will have a minimum threshold that
> must be overcome before it triggers and, all things being equal,
> the closest sensor will trigger first and its output will have the
> highest duty cycle, thus allowing the head to home in on the source.
> I suppose the trick is keeping the trigger levels of both 'eyes' equal.
> Good luck, it sounds like a nice project.
> What will you use to encode the position of the headbot?
> --- In firstname.lastname@example.org, "joshuagalloway73" <joshuagalloway73@>
> > Thank you for your help Joseph. The sources I'm trying to follow
> are modulated--one at 2.5kHz, and another at 4kHz, both (+/-)5% square
> waves. I'm hoping to encode the position of the headbot to
> > triangulation of the two beacons and subsequently, positional feedback
> > for my robot. I know I will have to build a couple of band pass
> > filters for the detectors. Mostly, I was just wondering if someone had
> > already done the work for me. If there is a schematic for an ir
> > headbot I could just slap some active filters on, I would love to
> see > it.
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