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Subject: Motorcycle helmet HUD (low-power wireless)
Date: 1 Oct 2002 19:43:28 GMT
Sender: William Sitch
User-Agent: tin/1.4.4-20000803 ("Vet for the Insane") (UNIX) (Linux/2.4.7-10smp (i686))
I have a radar detector with about eight LEDs indicating different
bands and signal strengths. Unfortunately it's mounted on my motorcycle
and I can't hear the beeping at any speed faster than 35mph. I would
like to see the LEDs in my helmet in a primative heads-up display. I
don't want to have to run a wire from the detector: it's a hassle to
What I would like to do is piggyback some electronics to the LEDs
within the detector and run a ribbon cable to an off-the-shelf
transmitter unit. If the transmitter has eight serial inputs and can
handle very low power inputs, even better! I can supply from 9-14V,
depending on the engine revs (usually around 12V).
I would then mount the ultra-low power (and very small!) receiver
inside my helmet with the outputs connected directly to a set of LEDs.
I would power the receiver with a small battery and hope to get
hundreds of hours of use. It would be nice not to have to turn it
on or off, but I could deal with that.
I don't need code-hopping spread spectrum. I don't need to receive
the signal more than 1m away from the transmitter (I would be sitting
on the bike, after all). It does need to be RF because the transmitter
will be mounted behind a plastic fairing. The transmitter can be a
Got any ideas? There has to be an off-the-shelf transmit/receive pair
that is relatively cheap and has eight serial input/output lines. The
receiver should be very low power, yet be able to drive the LEDs
directly. The transmitter and the Tx antenna should be fairly small,
and the receiver and the Rx antenna should be tiny.
Am I asking too much? Is this a really custom application? Can
anyone recommend a part or collection of parts? Got any other
Yes, the detector is legal where I live (California). No, I don't
speed, I would just like to know exactly where grocery stores are.
(The doors use a k-band radar to know when to open when you walk at
them) Thanks very much for your time.
William Sitch, B.Eng., M.A.Sc. will(at)sitch.org http://will.sitch.org/
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