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From: - René -
Subject: Re: Light gun circuit
Date: Mon, 13 Jan 2003 16:45:14 +0100
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On 13 Jan 2003 07:31:23 -0800, LouisCimon@sympatico.ca (Louis Cimon)
> wrote in message news:...
>> Louis Cimon wrote:
>> > Hi,
>> > I am looking for a circuit to build a target game. What I would like
>> > to do is do is project a target on a wall (5 to 20 feet, room with
>> > normal interior lighting). The gun should be able to detect the
>> > target.
>> > Ideally I would like to have 3 to 5 different simultaneous targets
>> > that the gun could recognize individually.
>> > I have seen a commercial target game that used a slide projector to
>> > project targets. I dont know how it worked but the gun was capable of
>> > detecting a very small specific part of the target.
>> Detecting colours in the target, bright patches, detecting flicker or
>> a beam scanned across the target areas, or even going the whole
>> hog, and sticking a video camera with microprocessor in there to do target
>> What's the budget, and do you want to make one or many?
>I intend to build a few (less than 5) and I have a low budget (less
>than 100$ per unit lower; cheaper be better).
>I was thinking to use a circuit built on a photo transistor (with a
>lens), an op-amp and a 567 tone decoder for detection and a 555 driven
>LED projected on a wall(using a lens)as target. This type of circuit
>is used (in reverse) by "laser tag" games. They use infrared and
>pretty good range (more than I need). Is this scheme workable?
>The other option that I was thinking about is based on color detection
>but I never saw circuits for this.
Better puls an IR led with ~ 38 KHz (led + collimator lens) , use a
stock standard integrated IR decoder for pickup (+ lens or pipe for
directivity) For multiple targets, perhaps use data protocol as used
in RC's (RC5?)
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