portable transmitter receiver PLZ HELP

Discussion in 'The Projects Forum' started by varunt, May 29, 2008.

  1. varunt

    Thread Starter New Member

    Apr 14, 2008
    6
    0
    i wanna make a portable transmitter which keeps on sending 16 bit data and a receiver which accepts this data.range should be around 300 metres.can receiver be made capable of receiving data simultaneously from more than 1 transmitter..say 10 transmitters..
    plz help!!!:confused:
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    I don't think that this project is just going to somehow happen. The distance is no problem, but what do you have in mind? What kind of data transmission rate? What frequency? what kind of modulation? What way do you have in mind to keep the 10 transmitters from interfering with one another?

    Also, what skills do you bring to this project? Can you assemble RF circuits from scratch? How are your programming skills?
     
  3. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    You might want to take a look at Microchip's rfPIC offerings.

    They are microcontrollers with built-in RF capabilities.

    Attempting to receive simultaneously on the same frequency from multiple transmitters is not likely to be very successful.

    Instead, consider having one being the "master", and all the others "slaves".
    The master sends out a code, which is a "request for information" with a bit combination that is the "address" of one of the slave units. The slave unit then responds on a different frequency with the information requested. Using a different frequency reduces the chance that other slaves may interpret a transmitting slave's data as a request for information.

    You don't have your contry in your profile. In the US, the frequencies on which one can transmit and the power levels one can use are strictly controlled. Laws concerning RF transmissions vary widely from contry to country. It is your responsibility to determine what, if any, frequencies and power levels that you may be able to use in your area. Violating the law may lead to confiscation of equipment, large financial penalties, imprisonment, and perhaps worse.
     
  4. contorteddoggy

    New Member

    Apr 14, 2010
    3
    0
    im looking for a simple RF on/off motor control with a reciever and a transmitter for 500m . could you help?
     
  5. contorteddoggy

    New Member

    Apr 14, 2010
    3
    0
    im looking for a simple RF on/off motor control with a reciever and a transmitter for 500m . could you help?
     
  6. Bychon

    Member

    Mar 12, 2010
    469
    41
    Doggy...you're supposed to post your own question...not walk in on somebody else's.
     
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