Cheap ebay RF modules made easy... (and fast!)

Discussion in 'The Projects Forum' started by THE_RB, Apr 23, 2013.

  1. THE_RB

    Thread Starter AAC Fanatic!

    Feb 11, 2008
    5,435
    1,305
    Hi, these crude carrier-only type RF modules can be bought very cheaply now from a number of online suppliers. (usually 433 MHz and 315 MHz modules).

    I did some testing of the modules and show how to use them for simple USART comms between micro-micro or micro-PC USB.

    I also tested the burst times and recover times etc, and tested transmitting a low frequency for people who might want to use these modules without microcontrollers.

    [​IMG]

    This kind of thing comes up from time to time on the forum, and although there are quite a few online projects using these modules those projects are usually pretty sketchy, usually just a schematic and some code.

    I've tested the modules a little bit more indepth, and hopefully this may be of use to others. :)

    Also I show a simple new data protocol to get much higher speed data transfer (and more data reliability). Source code is provided for that in C.

    The project can be seen here;
    http://www.romanblack.com/RF/cheapRFmodules.htm
     
  2. tshuck

    Well-Known Member

    Oct 18, 2012
    3,531
    675
    Thanks, Roman, I bought some of these modules years ago, only to realize I had no idea how to use them. After reading through your post, I'm thinking of digging those things out again.
     
  3. Sue_AF6LJ

    Member

    Mar 16, 2013
    45
    27
    That was a good write up.
     
  4. THE_RB

    Thread Starter AAC Fanatic!

    Feb 11, 2008
    5,435
    1,305
    Thanks guys. :)

    Even without a microcontroller they seem to work fine with a pulsed input. So someone could use a 555 timer to modulate the transmittter at a certain frequency, and just a simple analogue circuit to detect that frequency at the receiver.

    I know the "microcontroller" side can tend to put people off.
     
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