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How To Build an RF Transmitter/Receiver — Parallax Forums

How To Build an RF Transmitter/Receiver

crackticus potscrackticus pots Posts: 34
edited 2005-11-30 20:17 in General Discussion
hay does any body know how to make a very simple and very small
radio RF radieo reciver (and a transmitter to go with it)

Post Edited By Moderator (Chris Savage (Parallax)) : 11/29/2005 4:09:15 PM GMT

Comments

  • ForrestForrest Posts: 1,341
    edited 2005-11-29 17:39
    Buy a ZipZap Radio Control Car from Radio Shack for $12 and dissassemble http://forums.parallax.com/showthread.php?p=555731
  • crackticus potscrackticus pots Posts: 34
    edited 2005-11-29 20:41
    I checked google for simple radio circuts but every one wants me to sign up for these websites to down-load circuts
    and as for the car, I dont want to buy 65 cars and disasemble them.·I am trying to build a tiny inteligent senser pakage with distibutable micro sensers.

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    there are a hundred types of people in the world,

    but I dont have time to name them all.

    Post Edited (crackticus pots) : 11/30/2005 4:21:21 PM GMT
  • John R.John R. Posts: 1,376
    edited 2005-11-29 20:51
    OK: what kind of range, what type/volume of data are you tring to move, what security requirements do you have, and what kind of budget do you have. We probably assume you are looking for a RF module(s), not designing the RF transmitter/receivers from the component level.

    If you plan on having one receiver and a transmitter on each remote sensor, you may (will) have problems coordinating the transmission and reception. i.e. How do you keep all the sensors from transmitting at once?

    There are two ways (at least) to do this. One would be for each sensor to also have a receiver, and only send data when "polled" by the central data logger/collector/processor. Another would be to have each sensor on a different frequency/channel, but then the complexity (cost) of the receiver grows.

    There are a number of RF components and technologies available, they all have different advantages/disadvantages. There are also a number of other threads in the sandbox, basic stamp and SX forums. Even if you don't plan on using an SX (or STAMP), the discussions on how to deal with RF may apply to your problem.

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    John R.

    8 + 8 = 10
  • metron9metron9 Posts: 1,100
    edited 2005-11-29 20:54
    Lots of info and schematics here, as well as listings of single chip transmitter/receivers

    http://jap.hu/electronic/rf.html

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    Think outside the BOX!
  • PJAllenPJAllen Banned Posts: 5,065
    edited 2005-11-29 20:59
    I haven't tried any, but there are little xmtrs & rcvrs from/at www.qkits.com·and you probably couldn't make anything for as little as they cost.

    Assuming you're meaning data-links?
  • crackticus potscrackticus pots Posts: 34
    edited 2005-11-30 16:47
    John.R
    1. Data transmit: all the transmitter will transmit is a simple pulse or steady on.
    2. Yes i was planning on having a transmitter and a receiver on each.
    3. Medium security· (low external interference)
    4. The way i plan on coordinating the transmition is the reason each sensor has a receiver. The stamp checks the receiver and if something is already transmitting it will "wait its turn" to transmit. Plus the transponders check each other for a problem (eg.battery)
    Example:
    A1·transmits its simple serial signal "A1" the next transponder, A2, then·A2 eknolages·A1's signal and transmits·it's signal "A2" and on and on.
    but if there is a problem like if·C3 transmits "C3"·and C4 does not respond. then C3 will send "battery C4" three times just to make sure that the base station has received the signal.
    but if there is a sensor tripped (say sensor number·B6)··the sensor will send "alarm B6" three times.
    ·

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    there are a hundred types of people in the world,

    but I dont have time to name them all.

    Post Edited (crackticus pots) : 2/15/2006 4:19:15 PM GMT
  • crackticus potscrackticus pots Posts: 34
    edited 2005-11-30 16:52
    p.j.allin:
    these are the wrong tipes of radio, these are like FM sterio transmitters a need a simple 1/0 trans mitter and reciver.
    thank you though

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    there are a hundred types of people in the world,

    but I dont have time to name them all.

    Post Edited (crackticus pots) : 2/15/2006 4:16:01 PM GMT
  • mmmm Posts: 56
    edited 2005-11-30 17:20
    http://www.rentron.com/PicBasic/RemoteControl.htm

    Go to the page above and look for the TWS and RWS 434 transmitter and receiver modules then look at the page below for the example code for a basic stamp.
    http://www.rentron.com/Stamp_RF.htm

    Mike
  • metron9metron9 Posts: 1,100
    edited 2005-11-30 20:17
    Take a look at the sparkfun offerings, Tx and RX for under $19.00 also 2.4 GH stuff as well.

    Yikes, I just finished up an order for 178 bucks worth of sparkfun stuff. Are we having fun yet? jumpin.gif

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Think outside the BOX!

    Post Edited (metron9) : 11/30/2005 10:09:29 PM GMT
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