[visionegg] Re: Hardware for Vision Egg

Christophe Pallier wrote:


Yet, I found a company that sells USB response boxes (cf. http://192.131.102.99/rurb/tech.html) and, if I understood correctly an email they sent me, there would be a systematic (i.e. constant) 20millisecond delay between the key press and the registration by the USB system. If true, this would be not too bad for many situations, even if there are cases where this may not be sufficient.


Hum, I wrote this too quickly. I reread their email message, and it says:

"We've established the keyboard controller has a worst-case latency somewhere
around 7mS. A USB HID class device is then only polled with a 10mS latency,
that brings us up to 17mS."


There is not any reason to expect these latencies to be systematic...

Christophe



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