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Simple circuit parts

Discussion in 'Electronic Components' started by Jim, Feb 22, 2007.

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  1. Jim

    Jim Guest

    Hi guys

    I want to build this simple circuit to power my Xbox on and off via an IR
    remote control

    http://xirremote.tripod.com/

    Whilst I'm OK with soldering and building the circuit, I've got no idea when
    it comes to components. Could someone have a quick run through these parts
    and make sure they are what I need (the urls are to the RS components UK
    website and Maplins UK)

    IC - http://tinyurl.com/2dfdzb
    IR Reciver - http://tinyurl.com/2wglzf
    Diode - http://tinyurl.com/29xk27
    R1 & R2 - http://tinyurl.com/yo7d3o (codes D10K & D47K)
    C1 - http://tinyurl.com/ytop3m (code BX03D)
    C2 - got no idea anyone help please

    Many Thanks

    Jim
     
  2. Rich Grise

    Rich Grise Guest

    I have no idea - your tinyurls want me to register. Why not download the
    pages and slap them up on your website?

    Good Luck,
    Rich
     
  3. Better, post the RS order numbers. Anyone can then go to http://rswww.com
    and enter the part code in the search box. That's the easiest way to point
    others to RS parts from anywhere, at any time, and still guarantee they get
    up to date info.
     
  4. Sorry, your links don't seem to work now.
    That is a PIC, you can get them many places. The issue will be getting it
    programmed. I can probably help you out since the HEX file is available. I
    don't see any source code though. :-(
    These are pretty generic, so any will do fine. It just has to be made for
    the right frequency (56kHz aparently).
    Any 1/4W or 1/8W carbon-comp should do.
    You want a ceramice disc for C1 and an electrolytic for C2. Since the
    voltage in the circuit is so low, almost any will do.

    I looked at the schematic, and there are some things I wonder about. Most
    IR receivers have an open-collector output (meaning they can't supply a
    positive drive voltage on their own). I would expect to see an external
    pull-up resistor, I assume the creator is using the "weak" pull-ups built
    into the PIC. This may work ok, but may also be prone to noise pickup
    especially if the wires are longish.

    Too bad he didn't seem to provide the source, or I could have easily
    converted it to run on a smaller, cheaper PIC that I happen to have on hand.
     
  5. Jim

    Jim Guest

  6. Tim Duke

    Tim Duke Guest

    Hi Jim,

    The Tiny URL's that you have posted, take us to the RS website, but it tells
    me that the session has timed out! You would be much better off posting the
    RS order codes for us to look at.

    Cheers,

    Tim
     
  7. ehsjr

    ehsjr Guest

    If your goal is the learning experience, go for it.
    If you only care about remoting the thing, you could
    easily hack an old R/C toy car. You can still experiment
    and learn with the project as you outlined it, and
    you'll already be able to use xbox remotely while you
    play with the project. You'll have the hacked remote
    done in an afternoon with two relays, 4 diodes and a
    power supply. Conceptually:

    +V -------------+-----+
    | | ---o--> To xbox
    [RLY1] [D2] ^--o-->
    | |a
    A >-----|<----+-----+---o---
    D1 o--^ RLY1 -1 n/o contact
    |
    B >----->|----+-----+ o---
    D3 | | ^ RLY2 n/c contact
    [RLY2] [D4] o--'
    | |a |
    Gnd ------------+-----+---+


    Points A and B are the wires in the R/C car
    that normally connect to the motor.
    Run the car forward & RLY1 energizes and
    stays energyzed through its own open point
    and the closed point on RLY2. Run the car
    backwards, and RLY2 energizes, dropping
    out RLY1. The RLY1-2 contact set goes to
    the xbox.

    Ed
     
  8. Lord Garth

    Lord Garth Guest

    You'll need a suitable PIC programmer and what do you use for transmitting
    the on /off command?

    I'm assuming the PIC decodes some sequence of Ir pulses...perhaps it's
    trainable.
     
  9. Franc Zabkar

    Franc Zabkar Guest

    It's a 47uF 6.3V electrolytic capacitor, or 47uF 10V, or 47uF 16V.
    Connect its + terminal to the +3.3V supply, and - terminal to ground.
    - Franc Zabkar
     
  10. Jim

    Jim Guest

    Hi, thanks to all that replied

    Think I'm getting there.

    I do have an 'Elvis' programmer which does PIC chips left over from when I
    used to play about with satllite TV, just need to dig it out and refresh
    myself how to use it !

    My understanding is that the hex code will program the PIC to react to a
    given IR code (the 0 button and diplay buttons on the Xbox remote if I've
    read the xirremote site correctly) My plan is to download these codes into
    my learning remote so that I only need the one remote to control all my kit

    Any other input still welcome

    Thanks

    Jim
     
  11. Franc Zabkar

    Franc Zabkar Guest

    Just a question to those who are watching this thread.

    Are learning remotes fixed frequency devices (eg 38kHz) or are they
    able to learn the modulation frequency in addition to the various
    codes?

    I can envisage sensitivity problems if the remote's frequency is fixed
    at 38kHz when the Xbox expects 56kHz.

    - Franc Zabkar
     
  12. ehsjr

    ehsjr Guest

    Updated op via email. Circuit correction
    (use A or B, not A and B) below:

    +V -------------+-----+
    | | ---o--> To xbox
    [RLY1] [D2] ^--o-->
    | |a
    A >--+--|<----+-----+---o---
    B > | D1 o--^ RLY1 -1 n/o contact
    | |
    +-->|----+-----+ o---
    D3 | | ^ RLY2 n/c contact
    [RLY2] [D4] o--'
    | |a |
    Gnd ------------+-----+---+
     
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