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Convert constant +12V to pulse

Discussion in 'General Electronics Discussion' started by CustomTrading, May 28, 2016.

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  1. CustomTrading


    May 28, 2016
    • Open or close my front gate via a text message.

      Unless there is a better way, the main project (and my biggest issue) is to convert a constant +12V to a single pulse that activates a remote control.

      I have the Unimax HSPA+ Ethernet Modem Router with I/O Board

      The modem/router is already to turn on (+12V) one of the outputs when I send a text (Gate On). Sending another txt (Gate off) will turn off the output.

      I need to use the +12V output to activate the remote that opens/closes the front gate. I assume this will involve converting the +12V output to a single pulse.

      The remote I use to open & close the gate is a Magic Button MBTX4,172,Magic_Button,MBTX4,MBTX4

      I imagine the process working something like this –

      To open the front gate from the closed position
      Send txt (Gate On) – Applies +12V to the output of the I/O Board.
      Convert +12V to a pulse to activate button 1 or 2 (both buttons are programmed to open or close the gate) on the remote to open or close the front gate.
      Send txt (Gate Off) – Turns off +12V output on the I/O Board.

      The same process will need to be followed to close the front gate again.

      How do I do this? Who can build it? What will it cost?

    CDRIVE Hauling 10' pipe on a Trek Shift3

    May 8, 2012
    There are times when a simple (series wired) capacitor will suffice to convert a steady state voltage to a pulse. The pulse will be generated on the leading edge of the control voltage when it switches from 0V to (in your case) +12V.

    Other options would be a Monostable Flip-Flop that can be constructed from discrete components or IC's. The 555 Timer is arguably the most ubiquitous but not necessarily the best or only solution available to you.

    Arouse1973 likes this.
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