Re: Wheelchair proximity detection

["Internode" <somewhere@xxxxxxxxxxx>]

Hi David,

What is you floor made of? Could you put a IR transmitter into the floor
shining upwards?

Do you have any X10 equipment with say a W800 connected?

Neil.



"David Norwood" <judapeno@xxxxxxx> wrote in message
news:KFxzg.3781$zV6.2418@xxxxxxxxxxx
>I need to trigger an automatic door opener when my wheelchair is within
>about 3 feet.  I would like some sort of radio transmitter on the
>wheelchair and a receiver near the door.  Here are my requirements:
>
> - it must work at about 3 feet.  I can't find an affordable RFID reader
> that works at this range.
>
> - the transmitter must operate on a battery for at least two months
> continuously.  I like Bluetooth, but can't find a low power transmitter.
> What do they use on those automatic pet doors?
>
> - it must provide a simple contact closure, or have a serial or usb
> interface and Linux drivers.  Zigbee?
>
> - I'm not too concerned about security.  There are easier ways to get into
> my house than spoofing a radio signal.
>
> - it must not require too much soldering.  I have friends that can help
> with this, but within reason.
>
> I've seen various radio transmitter modules on the web, but don't know how
> much power they require, and how to interface a receiver to my computer.
> I've figured out how to do this with Bluetooth, but I have the power
> issue.
>
> David
>