Portable Generator of visual stimuli

Give some thought to exactly what you mean when you say "random" then apply timing constraints to it. I'd put a pair of LEDs on a glasses frame and power them from the serial or parallel port of your laptop. Program should be trivial. Once you figure out what works and finalize your design, you can build it around a single-chip processor with almost no parts. The hard part is gonna be the user interface to change the parameters. Although you could hook it momentarily to a computer to set it up.

Trying to do it without some programmable part is gonna be tough. Of course, if you change or relax your requirements, that chould change. mike

Hi all, I want to built or purchase a device with the follwing specification:

Imagine a box 10x10x10cm, with two medium sizes lamps on it one left one right, preferably something that can be commercially available so it can be easily replaced.

I want these two lamps to light randomly for example Left/L/R/L/R/R etc. I want to be able to control maximum and minimum interval between the light signal and the total number of signals whithin a standard period of time, lets say two minutes.

I would like that to be powered by a 9V battery, again that standard ones available.

How easy it is to make somthing like that and how much it will cost?? Any pointers to something similae

This device is going to be used in sport reflexes/reaction training.

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Some additional information you would need to specify before anyone could design this:

1) RANDOMNESS Do you really mean 'random' in the strictest sense of the word? I suspect not, and that a pseudo-random result of sufficiently long period would be OK. (Circuit complexity is greater for a genuinely random output.) 2) INTERVAL Needs more precise specification. For example: "Min interval between any two signals = 1 s; Max = 10 s." 3) TOTAL NUMBER Needs more precise specification, and recognition that this is not independent of the Interval setting. For example: "Min number of signals in 2 mins = 10; max = 30." That would be inconsistent with the Interval definition above, unless you were clear which setting was dominant. 4) SIGNAL DURATION You haven't specified the (presumably fixed) length of the light signal. Obviously, this too is not an independent control, although if it's a mere 'flash' then that is ignorable in practice.

It sounds as if it will have commercial value. Personally, if I was delivering a finished design or prototype, I'd expect to be paid .