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USB Interface

Discussion in 'Electronic Equipment' started by Matthew, Nov 24, 2003.

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  1. Matthew

    Matthew Guest

    I am looking for an USB (or serial) interface and program which will
    allow me to do the following.

    I need to create a 3 volt pulse at a variable rate of between 50 and
    400 pulses per second.

    I would like to vary the rate of pulse as CPU load (or something like
    that) changes.

    Any help would be greatly appreciated.
  2. I see two possibilities :
    - Either you use a pin of the RS232 port that is under owtware control (DTR
    line or similar), and you toggle it directly with a PC-based software, using
    on of the timers of the PC to set the rate. Vert easy under DOS, a little
    trickier under Windows...
    - Or you hook a small 8-pin micorocontroller on the serial or USB port and
    you program it to generate the good pulse rate, based on orders sent through
    the communication port. Easy with a serial port, a little more complex on

    Robert Lacoste - ALCIOM : The mixed signals experts
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