Alt-BEAM Archive
Message #06796
To: beam@sgiblab.sgi.com
From: "Chris" 123abc@chek.com
Date: Sat, 16 Oct 1999 22:27:30 -0400
Subject: [alt-beam] Ian update the PCB section...
Hey Ian please update the PCB section like you did for the charger. I know how hard building a web page can be, because it takes so long. Thanks for the great web page, I have a new PCB but I cant get it to the right size, it is of the Microcore on Miller's page.
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6797 Sat, 16 Oct 1999 22:22:37 -0400 [alt-beam] Re: Ian's PCB designs beam@sgiblab.sgi.com "Chris" <123abc@chek.com> But shouldn't I "mirror" them so when I flip it over onto the copper it will go on normally? cause if I don't it will go on reversed on the copper. And I'm a little confused about the actual etching, do I just iron it on and stick it in ferric acid? How long do I let it soak or what ever?
On Sat, 16 Oct 1999 15:56:50 -0700 Robert Stein wrote:
>At 05:37 PM 10/16/99 -0400, you wrote:
>>About Ian's PCB designs, are they ready to just print out and iron on or
>>do I have to edit them? I need to know cause I'm going to print them all
>>out at school and photocopy them a few times, and they get mad when you
>>waste their toner.
>>
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>
> Since you are going to use the iron method, they should be fine as
>is, but you might want to zoom in on the image and check for any shading
>that occurred. If you zoom in you will see some stray pixels of non white
>color, it may or may not have any effect, but it can't hurt to fix them.
>
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6798 Sat, 16 Oct 1999 19:33:14 -0700 [alt-beam] Re: IR object sensor and jammer beam@sgiblab.sgi.com Senior Ian Bernstein wrote:
>
> Hi
> I've built a few IR object detectors which use the sharp IR detector and
> a 40K emitter that will give me a range of about a foot max. If I disable
> the emitter and use my TV remote I get a range of like 8 feet. Why is
> that? And is there a schematic for an emitter circuit like the one in my
> TV remote? <- I think they just use an IC, but I don't know.
Is your circuit tunable? You might try tuning it, because it may not be
at exactly 40kHz. I know of people that purposely mis-tune theirs so it
isn't so sensitive, most setups detect objects 8 feet away, like you
said. So... See if you can get it at exactly 40K for more sensitivity.
> Also is there a way to jam a 40K object detector so it won't pick up an
> object that has the jammer on it. I think I remember something about
> emitting a 80K signal but I don't remember.
Hmm. Black is invisible to IR, so if you have a black bot it'll be hard
to pick up. But otherwise, I just don't know. Experiment, I guess.
See ya,
Kyle
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