Show Posts
Pages: [1]
1  Forum 2005-2010 (read only) / Interfacing / Re: 512 Switches to an Arduino? on: August 03, 2010, 08:24:36 pm
This is actually a really good idea about extendable modules. Especially because it would contain cost quite well.

Hmm...what sort of wiring scheme would that take? I can't seem to find anything relevant under "Serial Buffer".
2  Forum 2005-2010 (read only) / Interfacing / Re: 512 Switches to an Arduino? on: August 01, 2010, 12:24:12 pm
Now why couldn't one just simply daisy chain 64 shift registers together?
3  Forum 2005-2010 (read only) / Interfacing / Re: 512 Switches to an Arduino? on: August 01, 2010, 11:55:42 am
I'm looking at this IC Expander: PCA9555N

http://www.mouser.com/ProductDetail/NXP/PCA9555N112/?qs=LOCUfHb8d9s0Kg2ES8JE4g%3d%3d

Datasheet: http://www.semiconductors.com/acrobat/datasheets/PCA9555_7.pdf

It will require 32 of them to work, however, I am unsure if I will have enough available I2C addresses.

I did find an interesting device, though I don't know if my soldering skills are up to a 100 pin TQFP job.

It is the Cypress CY8C9560A-24AXI, which is a combo of a 60 device I/O, (or bidirectional, or pwm) i2c I/O expander, and a eeprom module (which can be disabled) piggybacked on.

It seems to be FULLY addressable (see page 4 of the datasheet at the link below.)

I do think that programming it to interface with the Arduino would be waaaaay above my current skill level though. :-(

http://www.cypress.com/?docID=20242
4  Forum 2005-2010 (read only) / Interfacing / Re: 512 Switches to an Arduino? on: August 01, 2010, 12:02:52 am
Its not a large device, it will all be in a 70 by 60 inch footprint. However, Arduino is my first play with a microcontroller project, so I really dont feel comfortable going into the realm of PICs and such yet.
5  Forum 2005-2010 (read only) / Interfacing / Re: 512 Switches to an Arduino? on: July 31, 2010, 11:07:13 pm
It will be between 30 and 50 small groups, however, I do want to keep the electronics well centralized. This whole contraption will end up on a homebrew motion platform, and so I don't want to distribute the electronics because it will make maintainence harder.
6  Forum 2005-2010 (read only) / Interfacing / Re: 512 Switches to an Arduino? on: July 31, 2010, 09:33:30 pm
The issue with Multiplexing (if multiplex = matrix) is the requirement for more than one switch to be activated at a time. (It could be 300 of the switches on at the same time.)
7  Forum 2005-2010 (read only) / Interfacing / Re: 512 Switches to an Arduino? on: July 31, 2010, 09:31:16 pm
Question 1&2 I assume are the same thing: 1/10th of a second, or some other human imperceptable amount...all these switches will be output to interfacing software on Windows. I have been reading the C# communications stuff, which is my preferred language.

Question 3: Again, some human imperceptable amount of less than half or 1/10th a second.

Ideally I would like to create on the fly grounds, and not be tied to a matrix scheme, as when I am using these, there will be some significant cabling runs, and I would hate to waste inputs when a certain panel only has say 5 switches, and it wastes 8 on that ground. (If this makes sense?)



8  Forum 2005-2010 (read only) / Interfacing / Re: 512 Switches to an Arduino? on: July 31, 2010, 08:55:30 pm
I forgot to mention that these switches will be a mix of momentary and non-momentary (ie toggles and rotary switches.)
9  Forum 2005-2010 (read only) / Interfacing / 512 Switches to an Arduino? on: July 31, 2010, 08:40:02 pm
Hey all. Just recieved my first Arduino. I have a project that requires ALOT of switches. My goal is to have 256 or 512 switches available. (512 is HIGHLY prefered...then I only have to use one board vs two.) I am looking at using daisy chained shift registers (What is the operational limit there as far as the processor on the Arduino?) and a matrix based off that, however my requirement is also that I need to allow any combo of switches to be "On" simultaneously.

Any ideas or directions? Just figured I would make a quick post because if I don't have to completely reinvent the wheel I would appreciate it!
10  Forum 2005-2010 (read only) / Bar Sport / Looking for a experienced Arduino developer... on: March 06, 2010, 02:53:07 pm
I hope this is the right place to post something like this, but I am looking for someone who is experienced with the Arduino system and would be interested in a compensated project.

It will involve such things as basic switch interfacing, LED, both discrete indicators, and backlighting, air cores, OLED display driving, and a few other options.

I am looking for a experienced person with a track record of sucessful work. Please email me at j.steensen@scsimulations.com.
11  Forum 2005-2010 (read only) / Uno Punto Zero / [m by=mellis destboard=barsport dest=1267905187]: Looking for a experienced Arduino developer... on: March 06, 2010, 03:10:43 pm
[moved] [link=http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1267905187/0]Bar Sport[/link] [move by] mellis.
Pages: [1]