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Voting pads

Discussion in 'Electronic Basics' started by [email protected], Nov 20, 2005.

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  1. Guest

    I am a secondary school teacher, and a programmer and would like to
    develop a voting pad system for my school. Could anyone give me some
    advice about what could be good possible candidates for tranmitters and
    receivers, (either RF of IR).

    I need to be able to receive and identify 4 different responses from
    about 30 units at the same time.


    Frank Byrne.
  2. Jasen Betts

    Jasen Betts Guest

    With that many units you could have frequent colisions where two units are
    trying to transmit at the same time.

    so some sort of polling or collision avoidance may need to be impplemented.
    that'd mean having a receiver and transmitter in each voting unit.

    the easiest way may be to start with a bluetooth (if it's got enough range)
    or wifi (major overkill) or possibly IRDA enabled microcontroller.

    the code to read (and debounce etc) the four buttons should be the easiet

    If you instead go with homebuilt or off-the shelf transmitters and receivers
    you'll have to do the collision handling yourself.
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