Subject:
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Re: running 2 IR
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 9 Apr 1997 17:09:50 GMT
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Original-From:
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Sriram Tirunellayi <sriram@ds5500.cemr.wvu./IHateSpam/edu>
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Viewed:
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1476 times
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>
Can we not tie two IR LED's in parallel and plug into the IR port on
the HB. ?
> What you can do is just like the schematic for the built-in IR emitter
> circuit. You need to either software generate your wave or do it like the
> schematic. If software generated, this output would come from a output
> port on the HC11 to a transistor base (a bipolar capable of handling the
> current requirements(collector current spec Ic) of the IR emitter. The
> emitter of the bipolar darlington (as in the schematic) would be connected
> to ground and the collector could be tied to one side of the emitter. The
> other side of the emitter would be tied high through a resitor that sets
> the current necessary to drive it. The transistor acts as a switch to
> ground driven by the HC11.
>
> Now, if you wanted three driven separately, you could use three output
> lines, or you could drive some logic to switch between them for you and
> have even more emitters if you wanted and use only three or four outputs
> total.
>
> jm
>
> On Sun, 6 Apr 1997, MAR ERICSON wrote:
>
> > You mean IR "emitters"? (IR LED)
> > If i understand you correctly, you wish to source current with the
> > digital outputs. The digouts are from the HC11. There can't source enough
> > current to light IR LED's.
> >
> > -----------
> > ericson mar
> > Master of Engineering Candidate
> > Project: Mobile Robotics
> > mar@cooper.edu
> > (212)353-4356
> >
> > Department of Mechanical Engineering
> > The Cooper Union for the Advancement of Science and Art
> > -------------------------------------------------------
> >
> > On Sun, 6 Apr 1997, victor w clark wrote:
> >
> > > I want to be able to run 2 or 3 IR xmitters from the single output on the
> > > HB with no additional hardware.
> > >
> > > Is there any problem with hooking two or 3 IR transmitters to the ground
> > > of the IR output and running the +5v from digital outputs. Then switch
> > > thru each one using the digital output. Only having one active at any
> > > given moment.
> >
> >
> >
>
>
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Message has 1 Reply:
 | | Re: running 2 IR
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| If the IR LEDs both add up to a current requirement of 800ma (the spec on the ztx614) then yes you should be able to. You may want to add a resistor to supply that assures you don't get more than 800ma from supply (if that is Imax for those LEDs). (...) (27 years ago, 9-Apr-97, to lugnet.robotics.handyboard)
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