How do TV remote ICs work

John Bond

Hi Guys
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Where can I get a spec on IR Detector/Decoder chips?
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Where can I get examples of the codes transmitted by Remote Controls?
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Unfortunately, the IR detector chip I’m using is a gray component (not the color, a “No Name” part with no markings). It works well with my TV remote and a Stamp and outputs the code as a pulse train consisting of 25 millisecond and 50 millisecond pulses and spaces (seems to be 6 pulses, 7 spaces).
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When I try to drive the IR IC using an IR LED and a 555 to modulate it to +- 35K. It only just works (range 300mm or 12 inches). I don’t have an oscilloscope so I’m groping in the dark
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Kind regards from Kwa Dukuza
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John Bond

Kenny Gardner

Reynolds Electronics is a good source for information relating to IR.

For the Encoder/Decoder chips:

http://www.rentron.com/remote_control/Holtek.htm#648

Also check the Projects section. Lots of good information. Much of it written for PIC's, but the information applies equally to Stamps. There·are also Stamp related projects.

http://www.rentron.com/remote.htm

You might also want to check out Parallax's IR Remote for the Boe-Bot (http://www.parallax.com/detail.asp?product_id=28139). A lot of usefull information there.

Kenny


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Kenny Gardner
GAP Development Company
http://www.gapdev.com/
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John Bond

Thanks Kenny

The Rentron Site has eveything I need. I was pulsing the IR LED continiously. It works with bursts of frequency of between 6 an 70 cycles. Rentcon also have encoder/decoder chips which will be useful

Kind Regards from Kwa Dukuza

John Bond