Microswitch to operate or replace mechanical switch?

Discussion in 'The Projects Forum' started by sethbang, Oct 6, 2011.

  1. sethbang

    Thread Starter New Member

    Oct 6, 2011
    2
    0
    Hi, folks. I would like to accomplish something but I have no idea how to do it. It does not involve a blender, but it's a useful for explanation.

    Blenders typically have a row of mechanical buttons. When you press one, the others are all released. So if you press Puree and then press Blend, the Puree button will pop back out.

    In my scenario, the mechanical buttons are replaced with momentary microswitches (Happ arcade buttons). Does anyone know if this is possible? Does something like this already exist?

    I want to make a gadget like a video A/B switch that can change composite outputs, but I want mine to have A/B/C/D options. There are mechanical versions of this (like a blender) commercially available but mine needs to be electronic.

    I appreciate any help you can provide. Thank you.
     
  2. crutschow

    Expert

    Mar 14, 2008
    13,011
    3,233
    You do this with a latch type flip-flop for each switch. Each switch output (positive signal) goes to the respective Set input of the FF. Each switch output also goes to one input of a 4-input (for four switches) NOR gate. The NOR gate output goes to a 555 timer configured as a 1ms one-shot. The output of the 555 goes to all the Reset inputs of the flip-flops.

    The operation is thus: Pushing the button causes the one-shot to momentarily reset all the FFs, but the one with the set input from the switch will go to the set position after the one-shot signal is done.
     
  3. sethbang

    Thread Starter New Member

    Oct 6, 2011
    2
    0
    Thanks, crutschow. I have to admit that I don't know what all that means, but it sounds promising. I will share your response with someone more knowledgable than I in this area and hopefully we can put it together. Thanks again!
     
  4. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Have a look at the attached that I whipped up a few months ago. Four switches, two 4013 D-flip flops, 1 resistor network, and 16 steering diodes; 1N914 or 1N4148.
     
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