AVR-Chat

Hey Chris!

> Anyone here know where to find a sensor that can recognize people
> entering a bus door?

It depends on what you want to do. Do you really truly want to RECOGNISE
PEOPLE? (vs, say, a person and a surfboard or a bike?) And just ones
ENTERING the bus door?

If you truly want to recognize people, and truly care about if they're
entering or exiting, you'll need a camera and some pretty sophisticated
video DSP.... though that sort of software is probably off-the-shelf these
days if you searched enough. But out of the range of any AVR except the
newish 32 bit AVR32 series.

> one that is not that expensive and is practical
> to use with an AVR?

If all you care about is seeing if someone or something is in the doorway,
and you have the ability to mount something on both sides of the door then
this is trivial. - A standard interruptable light beam could work perfectly
there. They're really common, and very easy to interface. I played with some
that had active low open collector object detect, couldn't be simpler. You
can use a TX/RX unit on one side, and just have a reflector on the other
side.




Julian Higginson
Bruttour International P/L
Tel :  +61 2 9987 1581
www.bruttour.com.au