How to control a box of series push button

Dear Sir or Madam,

I am relatively new to LabView and National instruments, but try to capture the response time of a human participant.

A simple example of the tasks that I hope to accomplish is described as follows. I think that first of all, I will write a Labview program to present two pure sounds to the listener (one at a time), with a tone have higher than the other ground. In other words, pure acoustic sounds will be delivered to the ears of the listener through a series of regular computer headset. After listening to the two-tone, work of the participant is to discriminate which has higher ground, then press a button accordingly. My question is in relation to the buttons... It is my understanding that the buttons can be:

(1) software buttons that are displayed on a touch screen computer.

(2) physical buttons on a separate reply box which is connected to a serial port on a PC, or

(3) physical buttons on a separate reply box which is connected to a material OR (an e/s of control map, perhaps!?)

For some reason, he is I think understand that by using the internal clock of a PC is not reliable, due to the nature of multi - load Windows System. In other words, either by using a touch screen or a serial port on a PC is not a good idea; because if I do this, I use the internal clock of my computer, which can be interrupted by other programs running simultaneously on Windows System. In other words, the multitasking nature of Windows of the system will be inaccurate and unpredictable reaction time. It is also my understanding that, if I want a good accuracy reaction time (for example, down to words maybe 1 or 5 msec!?), I would need to use a separate clock which is designated only for this task. Once again, I'm stretching and trying to accomplish a task that is new to me, and I don't know if I'm not mistaken...

I currently have several cards to control IO OR in my lab. They are the USB - 6216 BNC, PCI-6221 (with a block of connection BNC-2090), data acquisition 6062E WLS-9215 BNC and DAQ wireless. For the purpose of this new task, I think more on the use of the USB-6216 BNC or PCI-6221, if any at all. NOR sells any push button and related devices? So, I can use the clock inside a card of control of e/s? Or I have to buy a new set of devices?

If someone could advise me on what configuraitons or options would work best for me this task, I'd be very happy.

Sincerely,

Fuh


Tags: NI Hardware

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