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Article #93Re: Best way to power array of LEDs?
From: Spehro Pefhany
Date: Thu, 05 Dec 2002 18:59
Date: Thu, 05 Dec 2002 18:59
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3140 bytes
On Thu, 05 Dec 2002 16:33:44 +0000 (GMT), the renowned Tony Williams <tonyw@ledelec.demon.co.uk> wrote: > > Are you talking about the chap, (and I prefer to > remain anon please Speff), who did this stupid perp? > > 20mA > +Supply---->----/\/\---+-----|>|---- 0v. > | LED > PIC port pin-----------+ > > Had this brilliant idea that could could turn > the LED On/Off by toggling the port pin from an > input, to an output at logic 0. Aside from the obvious worry if TRIS or PORT latches get flipped by noise, it should work, assuming +Supply <= Vdd + 0.3 (except for the funky open drain output w/o protection diodes that some of them have). Though I don't think Vout(low) is guaranteed at 20mA, it should be low enough even for a red LED, shouldn't it? (at least with the current crop) Best regards, Spehro Pefhany -- "it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.co
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 112d1e,4ef4c9d4aea85e1f X-Google-Attributes: gid112d1e,public X-Google-Thread: 10d137,4ef4c9d4aea85e1f X-Google-Attributes: gid10d137,public X-Google-Thread: 1118be,4ef4c9d4aea85e1f X-Google-Attributes: gid1118be,public X-Google-Thread: 1131b0,4ef4c9d4aea85e1f X-Google-Attributes: gid1131b0,public X-Google-Thread: 103407,4ef4c9d4aea85e1f X-Google-Attributes: gid103407,public X-Google-ArrivalTime: 2002-12-05 10:59:57 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!news1.google.com!newsfeed.stanford.edu!canoe.uoregon.edu!arclight.uoregon.edu!wn14feed!worldnet.att.net!64.154.60.72!cyclone2.usenetserver.com!newsfeeds-atl1!newsfeeds-atl2!news.webusenet.com!news03.bloor.is.net.cable.rogers.com!news04.bloor.is.net.cable.rogers.com.POSTED!not-for-mail From: Spehro Pefhany <speff@interlog.com> Newsgroups: sci.electronics.components,sci.electronics.design,alt.engineering.electrical,aus.electronics,sci.electronics.repair Subject: Re: Best way to power array of LEDs? Organization: Rather Message-ID: <h48vuuordbt547u37tb38vpfivfqm2t0at@4ax.com> References: <anku2n$5so$1@news.wave.co.nz> <7tGLdeAS6fn9EwBv@jmwa.demon.co.uk> <apvlvu$n2c$1@reader1.panix.com> <KVdHjAAjM3w9Ew8l@jmwa.demon.co.uk> <aq17gb$7ut$1@reader1.panix.com> <slrnasg1o7.1t5.Znospam+noZs_0211@hpb13799Z.Zboi.hpZ.com.invalid> <aseln1$jbb$1@reader1.panix.com> <Rm2H9.4457$5P3.213056@newsfeed.slurp.net> <4dqpuugil5jens3iu7uprml0hdjl5e5dqs@4ax.com> <4ba01ef90etonyw@ledelec.demon.co.uk> <c9ruuu87bn6t539n1se6ejueb1u1lia0j6@4ax.com> <4ba0275featonyw@ledelec.demon.co.uk> X-Newsreader: Forte Agent 1.92/32.572 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 33 Date: Thu, 05 Dec 2002 18:59:56 GMT NNTP-Posting-Host: 24.112.151.88 X-Complaints-To: abuse@rogers.com X-Trace: news04.bloor.is.net.cable.rogers.com 1039114796 24.112.151.88 (Thu, 05 Dec 2002 13:59:56 EST) NNTP-Posting-Date: Thu, 05 Dec 2002 13:59:56 EST