Re: some help in technical solution

Here is another very cheap solution: http://www.pjrc.com/teensy/ The small board has 25 digital I/Os and 7 analog for $16, and the larger one has 46 digital I/Os and 12 analog. If your competitors are close enough you can use one board for multiple inputs. Since you need to hook key presses which

Re: some help in technical solution

I see two possibilities: 1. Connect the mice to a PC in which the X-Server is not activated. If you need to display graphic results, use two networked computers. 2. Use explicit /etc/X11/xorg.conf >From reading man xorg.conf: - Disable hotplugging. - SendCoreEvents off for all identified mice exce

Re: some help in technical solution

Hi Regarding the solution of mouse or numeric keypad (with USB hubs), I have no clear idea about the technical obstacles. I think that main ones are: (1) bypass X system, and direct the events from particular sources (those mouses or numeric keyboards) to my app. (2) process the events by mys

Re: some help in technical solution

I think any analog DAQ based solution will be expensive. Use too many analog levels, and it will not be accurate. Use a small number of levels, and the price per port for analog connection will drive the price too high. You can try using computer mice. cheap 2 button+scroll wheel starts at 17NIS

Re: some help in technical solution

I think that analog DAQ with 30 channels would be an overkill for such an application. If you need to give each competitor 4 options, why not choose between one of the following options: 1. 120 digital channels (5 digital DAQ modules at 24 channels each) and provide each competitor with 4 channels

Re: some help in technical solution

Hi This is interesting idea. However, it support voting between 2 options, only, while I need at least 4 options. I thought that combination of analog DAQ and 4 push buttons with analog output may help here. Does someone have an idea about such combination (analog DAQ+edge unit)? With best re

Re: some help in technical solution

I think the best solution would be to use a data acquisition device, either USB or PCI. Measurement computing sell relatively cheap devices, e.g. this USB one for $99: http://www.mccdaq.com/usb-data-acquisition/USB-1024-Series.aspx

Re: some help in technical solution

On Wednesday, 6 בApril 2011 08:11:24 Omer Zak wrote: > Unless I am mistaken, the USB specs stipulate that it shall be possible > to connect up to 127 USB devices to a PC. > > So what you want to do should be doable. However I don't know the > chances of it exposing bugs in the Linux USB subsystem

Re: some help in technical solution

Unless I am mistaken, the USB specs stipulate that it shall be possible to connect up to 127 USB devices to a PC. So what you want to do should be doable. However I don't know the chances of it exposing bugs in the Linux USB subsystem, as it is a rare use case. However, if you are providing hard

some help in technical solution

Hi all I need application that will be able to collect and process inputs from 30 (!) competitors, and will display the results very fast. The ideal solution could be to collect the inputs via SMS: each competitor send his answer, the application collect the answers (related to phone number)