home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: sci.electronics
- Path: sparky!uunet!haven.umd.edu!darwin.sura.net!wupost!uwm.edu!ux1.cso.uiuc.edu!news.cso.uiuc.edu!usenet
- From: tmkk@uiuc.edu (Khan)
- Subject: Re: Need encoding scheme for TV remote infrared controller
- References: <1992Sep2.003540.24065@aio.jsc.nasa.gov>
- Message-ID: <BtyE2K.3ts@news.cso.uiuc.edu>
- Sender: usenet@news.cso.uiuc.edu (Net Noise owner)
- Organization: University of Illinois at Urbana
- Date: Wed, 2 Sep 1992 13:42:19 GMT
- Lines: 30
-
-
- In article <1992Sep2.003540.24065@aio.jsc.nasa.gov> mancus@roger.jsc.nasa.gov (Keith Mancus) writes:
- > We're in the process of building a small robot, and we'd like it
- >to respond to a TV remote control. Can anyone tell us:
- >
- > (1) Is there a standard carrier frequency?
-
- There isn't a standard ANYTHING. Many remotes operate on 40kHz IR carrier
- frequencies, but it's far from being a standard.
-
- >The IR sensor we're using detects 40 MHz.
-
- Unless that was a typo and you really meant 40kHz, your sensor is
- probably useless for picking up IR transmissions from TV remotes. ;-)
-
- > (2) Is the encoding scheme standardized?
-
- Not by a long shot.
-
- > (3) Are there any other pitfalls we should know about?
-
- Borrow/obtain an oscilloscope, hook the output of your IR receiver to
- the scope's inputs, and power everything up. Then aim the remote you
- intend to use at the IR receiver module, and observe the oscilloscope
- screen. After playing around a bit, you should be able to determine the
- encoding scheme used, or at the very least which patterns go with which
- buttons, and programn your robot to respond accordingly. If the screen
- remains blank, either your remote is broken or it's not using a carrier
- frequency compatible with your IR receiver.
-
-