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'[EE]: How does IR remotes work?'
2001\03\06@135838 by Frej

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How does a remote controller work (eg. TV remote controllers etc.)
Any webpages explaining this and explaining how to decode the (PWM?) signal would be gladly accepted.

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2001\03\09@224901 by Jeethu Rao

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Dear Frej,

Sorry to Comment , but this is Kid stuff. You ask my 10 year old brother and
he'll tell you how. IR based systems are much easier than Radio systems. But
the range is limited and its directional. Try http://www.howstuffswork.com
This site is especially designed for the inquisitive kind of people.

IR Remote controllers work by simply sending an appropriate code by
modulating an IR Beam from a IR LED. The Reciever Simply demodulates the
code from the IR Photo Diode (or Photo Transistor) and executes the
predesignated function. Thats it , there is no Rocket Science Involved.
Absolutely Not!!

If you want to ask about encoding schemes , then I'm sorry for my remark.
Because data transmission and reception are quite complex by themselves
especially if you want to implement Error Tolerant algorithms.Try Reading
about Manchester Encoding on PICList.org  .

Regards,

Jeethu Rao

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2001\03\13@165639 by Gennette, Bruce

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They work just how you expect - they pulse the LEDs with specific patterns
for each command with a set structure, start, message, stop - except that
the LEDs have built-in oscillators that flicker the 'On' periods at around
30 - 40kHz.

The receivers have a small piece of circuitry in them that only reacts to
pulsed light, NOT continuous. They do this so that light from other sources
is not recognized by the receivers.

The transmitters and receivers are (usually) flat, square boxes with 3 leads
- not just LEDs or photo transistors, etc. You have to use the correct
frequency transmiters and receivers to match your equipment [and naturally
different manufacturers use different frequencies, although the world seems
to have settled down to just 2 now].

Using PICs you could drive LEDs at the correct rate and software filter the
inputs, but the transmitter/receiver devices are pretty cheap, so the
programing overhead might be unwarranted [sorry to speak anti PIC, but
sometimes you just can't use a screwdriver as a hammer].

Bye.


{Original Message removed}

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