56931Re: Headbot circuit for IR
- Nov 3, 2007Thank 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 allow for
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.
--- In email@example.com, "Joseph Charles" <jodicalhon@...> wrote:
> Hi Joshua,
> Any head design that uses IR diodes as the sensors is reacting to
> IR in the environment.
> If you want your design to follow a particular source, you will need
> to have it ignore unwanted environmental sources. You could shield
> your sensors, or you could use a modulated IR source.
> The difficulty with using modulated IR receivers as the sensors in a
> head design is that they are not sensitive to the relative distance of
> the source to the sensor. A T.V. remote works as well from 5 metres
> away from the receiver as it does from 1 metre away.
> The idea that Wilf used in his 40kHz Herbie scheme is probably your
> best bet if you want to go down that road.
> The circuit is here:
> The genesis of the circuit is here:
> And there is more concerning a particular application, with some
> caveats, here:
> Feel free with any further questions.
> --- In firstname.lastname@example.org, "joshuagalloway73" <joshuagalloway73@>
> > I was wondering if someone new of a link to a schematic for a head bot
> > type design that follows an IR source. I would like to use a circuit
> > like this for a school project instead of another uC.
> > Joshua Galloway
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