Re: i-dropper

["Alan Vogel" <avogel2@xxxxxxxxxxxxx>]

Ah, but then you would have to be almost on top of the sensor in order to
communicate.

At that point it may be better to just touch the key to a mating pair of
contacts.  Or if ESD is an issue, use a wireless RFID like the one mentioned
in the link below.

But if you're indoors, I would think that the LED system should work most of
the time.

"Dave Houston" <nobody@xxxxxxxxxxxx> wrote in message
news:44312be3.858943843@xxxxxxxxxxxxxxxx
> It should be easy to prevent sunlight from hitting the LED. You could make
> it the proverbial "light at the end of a tunnel". ;)
>
> Here's another link that shows it being used for a touchpad like input
> device.
>
>     http://mrl.nyu.edu/%7Ejhan/ledtouch/index.html
>
> "Alan Vogel" <avogel2@xxxxxxxxxxxxx> wrote:
>
>>A nice idea, but if this technique is used for keyless entry outdoors then
>>I
>>would think that sunlight could saturate the LED.
>>
>>Here's another clever idea from MERL, based on an idea from Microchip's
>>old
>>"Designing For Dollars" competition.
>>
>>http://www.merl.com/papers/docs/TR2002-21.pdf
>>
>>
>>"Dave Houston" <nobody@xxxxxxxxxxxx> wrote in message
>>news:442eaff2.696142765@xxxxxxxxxxxxxxxx
>>> Here's a really neat, super secure and super cheap way to implement
>>> things
>>> like keyless entry.
>>>
>>>     http://www.merl.com/reports/docs/TR2003-35.pdf
>>
>