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Participant

Join Date: Feb 2017
Posts: 2

Some Questions About My Infrared Remote Controller Design

03/22/2017 11:37 PM

Hi! I wonder if it is suitable to post this question here? Since it's about remote problems.

Have anyone ever designed an infrared remote controller? There is a homework for me to design a remote controller with several components.

But as I don't quite clearly know about the resonators which are necessary in a controller, I want to ask for your help.

My friend recommend me some ceramic resonators, and I chose this one: AWCR-20.00MD.

Now can anyone ansewer me the following questions:

  • 1.Should I take the quality factor into consideration if I use it in my controller?
  • 2.Someone will use quartz crystal resonators when designing communication equipment, is it OK for me to use ceramic resonator rather than the crystal one?And what are the advantages and disadvantages of both of them?
  • 3.Do you have any other recommendations of the resonator?

Any suggestion will be appreciated!Thank you very much !

FYI here's the datasheet of AWCR-20.00MD:

www.kynix.com/uploadfiles/pdf8827/AWCR-20.00MD.pdf

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Guru

Join Date: Mar 2007
Location: at the beach in Florida
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#1

Re: Some questions about my infrared remote controller design

03/23/2017 12:34 AM

"Modern IR transmitters typically use 8-bit microcontrollers with a 4 MHz master clock frequency, allowing a nearly arbitrary selection of the carrier frequency."

Remote ir controllers are built for purpose....the purpose will dictate the design....and the desired price point will dictate the quality.....

https://en.wikipedia.org/wiki/Consumer_IR

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Guru

Join Date: Apr 2010
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#2

Re: Some Questions About My Infrared Remote Controller Design

03/23/2017 9:22 AM

Infrared radiation is very prevalent in the environment, generated by incandescent lighting and sunlight. For an infrared data link like a remote control to communicate using infrared, the receiver needs to be able to discriminate the transmitter's signal from all the environmental noise. To do this, the transmitter modulates its signal using a resonator and the receiver has an identical resonator to tune into the same frequency.

The difference between a quartz and ceramic resonator is that the quartz has a narrower bandwidth. With the quartz resonator, you have better noise rejection but the frequency alignment between the transmitter and receiver is more critical.

Probably in your application, either should suffice.

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Guru

Join Date: Mar 2011
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#3

Re: Some Questions About My Infrared Remote Controller Design

03/23/2017 11:20 AM

How about you try that resonator, and let us know how well it works for you?

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Guru

Join Date: Sep 2016
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#4

Re: Some Questions About My Infrared Remote Controller Design

03/23/2017 12:58 PM

get the specs and try to model in open modelica. Easy evaluation of your design can be explored there.

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Guru

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#5
In reply to #4

Re: Some Questions About My Infrared Remote Controller Design

03/23/2017 1:24 PM

I am surprised by that relevant answer. You stop that.

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#6

Re: Some Questions About My Infrared Remote Controller Design

03/24/2017 11:08 AM

As has been mentioned you will have to have a carrier frequency to differentiate your IR signal from all the ambient infrared flying about. This is typically 38 to 40 kHz for AV type equipment. There are pre-built receivers called Pre-Amps which receive the modulated signal and output a digital signal having striped off the modulation. Why these can be made from discrete components the Pre-amp puts it all together in one nice box which already has a lens to collect the signal.

Shawn

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#7
In reply to #6

Re: Some Questions About My Infrared Remote Controller Design

03/24/2017 11:45 AM

Cool. Sounds like a plan. I think we used to call that a "chopped" signal back in the old days of disc choppers.

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#8

Re: Some Questions About My Infrared Remote Controller Design

04/07/2017 6:29 AM
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