Re: TI-H: Scanning Sonar

To: ti-hardware@lists.ticalc.org
Subject: Re: TI-H: Scanning Sonar
From: "Matthew H. Fogle" <cs239ac@chicoma.la.unm.edu>
Date: Wed, 26 Nov 1997 08:54:32 +0000
Organization: S.P.O.T. Enterprises
References: <19971126074311.21916.qmail@hotmail.com>
Reply-To: ti-hardware@lists.ticalc.org

Muhammed Galadima wrote:

> Polaroid makes them, and I think Fujitsu does too but I'm not sure.
>
> Couldn't IR proximity detectors be used instead? They would be alot
> cheaper and the hardware is easy to find on the net.  ...of course IR
> it
> has its own problems...
>

IR is going to have problems with detecting things in the shade. Sonar
is more expensive but FAR worth it when you are designing something that
needs to be accurate and work well.

> Mj
>
> >
> >Uh; I'm curious; where did you get the sonar unit in the first place?
> I
> >need to get one for the next robotic competition here.
> >
> >Muhammed Galadima wrote:
> >
> >> The speed of sound calibration part is easy: just do speed_sound =
> 331
> >> +
> >> 0.6 * temperature
> >>
> >> >Since TI85s don't have built in timers, I'd suggest an external
> 555
> >> yes, that's great idea! but how can it be interfaced with the calc?
>
> >> can
> >> will Matthew's I/O expander do the trick?
> >>
> >> >you described and 2) a Terrain Style
> >>
> >> what do you mean by terrain style? is it elevations?
> >>
> >> >I'm still realtivly new to electronics but seems like a pic might
> be
> >> >over-kill for a simplesend-time-stop-reset circut.  If anybody
> could
> >> >hardwire one of these things I'd probably pay.
> >> >
> >>
> >> you're right, the PIC is definitely overkill
> >>
> >> Mj
> >>
> >> ______________________________________________________
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> >
> >
> >
> >
>
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References:

Re: TI-H: Scanning Sonar

From: "Muhammed Galadima" <mj_galadima@hotmail.com>