Start another war involving America, all the military satellites come online
and use GPS I think when all the satellites are operational the accuracy is
in the cm's (<10cm)

Regards,

Kat.

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----- Original Message -----
From: "Madhu Annapragada" <madhu@CONECTIV.NET>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Friday, August 31, 2001 9:51 PM
Subject: Re: [EE]: - Botboard


> I have been toying with this idea for a while and I will throw it out
there
> to see if it even holds up to the piclist scrutiny. What do you think
about
> teaching the bot the first time? With heading information from a compass
and
> wheel rotation information from encoders, the bot would build a table of
> heading changes vs wheel rotations the first time (starting from a home
> position). One would use a joystick to mow the lawn the first time. The
bot
> records the wheel position every time the heading changes by a certain
> amount. The second time around, the bot would head out in the first
heading
> direction until it reaches the wheel rotation figure for the next heading
> change, change to the new heading and so on.
> Of course, the problems I see right away are wheel slippage and  noise
from
> the compass. But for arguments sake, if I could solve those problems, do
you
> see any other potential pitfalls for this method. The merits of this
method
> are that you do not need to depend on any external markers. Teach it one
> lawn ( even multiple lawns using a selector switch) and let it go from a
> know position every time. One might have to re-teach it every so often if
> the bot starts wandering into the flower patch....
> Anyway, does the method seem feasible?...winter is coming and I need to go
> into hibernation in my basement lab...
> Madhu
>
>
> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Jinx
> Sent: Friday, August 31, 2001 8:26 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE]: - Botboard
>
>
> > How are you planning the cutting path ?
>
> The most successful I've seen is tracking a buried wire. Not
> sure what the signal is but the demo looked pretty good. If
> you edged the area with white (painted bricks ? logs ?) you
> could perhaps use optics. Industrial robots follow a white line
> around their work area
>
> --
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>
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>

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