ir(lotta motherboards have it built in, though maybe not the one you're
using, but it's just a serial port), bluetooth(gumstix use em, they're
small, seem to be unubtrusive, might use a usb bluetooth adapter),
wireless ethernet bridge(dlink makes some nice ones), coils buried under
carpet or in concrete(is called inductive loop, can also charge the bot),
ultrasonics(besides having every dog in the neighbourhood wailing
uncontrollably it should work wonders), there may be another few i'm
missing, but i figure those are the biggies, and yes, i'm aware of a lack
of periods and the long braketed notes, suffer.
Using Opera's revolutionary e-mail client: http://www.opera.com/mail /
> I want to use rf and want a range of at least 120' feet.
You might want to look at some of the Laipac stuff; there's a 2.4GHz
transceiver module (obviously you'd need one at each end) that can give
a range up to 150m at 1mbps:
If you've actually got a PC on board the robot, you could always use an
802.11b/g WLAN with decent antennae - these can extend the range quite a
bit. (Lots of info on this in the O'Reilly book "Wireless Hacks")
Kadina Business Consultancy, South Australia
I've just started using MaxStream's 9XCite transceiver modules. Got PC-to-PC
and PC-to-microcontroller comms going in a matter of minutes. No need to
worry about all the low-level software stuff required for some of the
cheaper chips. Very plug-and-play. Very nice.
What I am using is standard Wireless 802.11g wireless networking. You pick
up waps or routes for like $29 dollars these days.
If you use a UNIX like Linux or FreeBSD, it is much easier. You can open up
a command line console to the robot over the link. You can even run
graphical programs on the robot and set the display to be your desktop
With SSH you can set compression across the radio link to increase effective
You can hack a 900mhz cordless phone that
you get from thrift store for a buck. It takes a
transformer and two pots. 2.4ghz phones work too.
I think they should get about 120ft. Need a modem
on your robot, and a modem on the controlling
I got the system to work but HD creates horrible
noise on the line.
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