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From: LouisCimon@sympatico.ca (Louis Cimon)
Subject: Re: Light gun circuit
Date: 13 Jan 2003 14:51:13 -0800
References: <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org>
NNTP-Posting-Date: 13 Jan 2003 22:51:14 GMT
- Ren - wrote in message news:<email@example.com>...
> 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.
> >> Options:
> >> 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
> >> recognition.
> >> 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?)
The problem is that I dont see infrared so I must use a visible light.
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