Subject:
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Re: IR o/p
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Mon, 5 May 1997 18:11:44 GMT
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Original-From:
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Sriram Tirunellayi <sriram@ds5500*saynotospam*.cemr.wvu.edu>
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Viewed:
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1150 times
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> Hi All,
some questions on the IR transmitter.....
This is what i get on my scope when i connected the +ve to the
> anode of the LED and -ve to the GND of a digital pin on the HB.
> then i poked(0x1000, 0x40)
------||-------||---------||-------||----
> -> <-- --> <-----
> 3microsec 15microsec
>
> The square waves look like small pertubations and are of very small
> amplitude, probbaly 0.1V. Theres a DC offset when i switch on the HB
> of 1.5V. This doesnt look right to me.
40KHz, ie(25microsec) is it the time period of the high
> signal (in the fig its 3microsec)
> OR
> the distance btw one high to another high? (15microsec in fig)
>
> moreover is the square pulse the time of charging and discharging of th
> e CAP C6? what should be the amplitude of the pulse?
>
> Thanks
> Sriram
> ----------------------------------------------------------------------
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