Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

How was infrared remote encrypted?

  1. Feb 24, 2012 #1
    First of all, besides the question in the title (which is an open ended question) can someone please tell me whether it is possible to "record" all infrared signals?

    If it's impossible, is it impossible in the way that virtually every remote for certain appliance has its own unique frequency (wavelength, to avoid confusion with Duty Ratio), so it's impossible to record them using a Infrared receiver-diode, or is it extremely difficult?

    If you have anything to say, please fill me in, I'll be more than glad to hear. Thanks!
     
  2. jcsd
  3. Feb 24, 2012 #2

    jim hardy

    User Avatar
    Science Advisor
    Gold Member
    2016 Award

    most of them operate at 40 khz
    here's a "how to" article

    http://www.ti.com/lit/an/slaa134/slaa134.pdf

    some years ago i stumbled across a hobby site of enthusiasts customizing their controlers, wisg i still had link.

    old jim
     
  4. Feb 24, 2012 #3
    shouldn't be too hard, i mean, universal remotes exist.

    have an IR photoresistor hooked into an analog (?) port of an arduino
    have the serial port output values to a computer, normalize as appropriate
    at this point its a matter of analysis
     
  5. Feb 24, 2012 #4
    That pdf is more than helpful, thanks a bunch!
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook