PC-USB Encoder needed, with ~1,500 switches!

Thu Dec 22, 2011 4:50 am   

Hey all,

I’ve seen several USB 8-128 possible switch encoders.

I need an encoder that can handle ~1,500 possible switches.

I’d then need to write a listener, to decode and call the custom code.

I need to first build the encoder…becauase I cant find anything
online. Any suggestions where I should start?

Thu Dec 22, 2011 6:13 am   

In article <ba3a6215-ad05-4b47-a6a7-e8f259e17c22
@p16g2000yqd.googlegroups.com>, christopher.issler_at_gmail.com says...

Is only one switch closed at a time, or
can 2-1500 switches be closed at the
same time?

Thu Dec 22, 2011 6:46 am   

"christopher issler" wrote in message
news:ba3a6215-ad05-4b47-a6a7-e8f259e17c22_at_p16g2000yqd.googlegroups.com...


I'm not sure what kind of switch encoder you are looking for. A quick search
came up with:
http://www.beiied.com/PDFs2/Encoder-Converter_USB.pdf

Microchip has a good inexpensive USB development board and USB stack with
demo software that can read switches and light LEDs. They have HID class
devices which can emulate keyboards with 100+ keyswitches.

Paul

Thu Dec 22, 2011 9:36 am   

On 2011-12-22, christopher issler <christopher.issler_at_gmail.com> wrote:

avrusb, it's bleeding edge cheap which may ne a problem but you get
access to a HID stack which you can use to represent youur switches.
to the computer. (I don't recall how many buttons HID can represent)


OTOH an image sensor with a 32x48 matrix might be a more suitable
representation.

but the easiest way would probably be tu use a usb serial port.
and some sort of microcontroller and invent your ouwn serial
protcol

eg: (binary)

00xxxxxx 10xxxxxx means swich xxxxxxxxxxxx closed

and

01xxxxxx 10xxxxxx means switch xxxxxxxxxxxx opned.



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