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Automatic Timed Polarity Switch and Shutoff

Discussion in 'General Electronics Discussion' started by jkompa, Mar 24, 2015.

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  1. jkompa


    Mar 24, 2015
    First off thank you to anyone who is able to point me in the right direction. I am a mechanical guy and have confused myself trying to dig into circuit development.

    I am looking to keep the circuit as simple as possible. I will be powering system using a wall adapter for 110V AC however I have found wall adapters to convert this to 6V DC for me which I will use in order to simplify my circuit unless someone lets me know a reason not to. The 6V DC is what is specified for the two components I am trying to run, a Micro Stepper Motor and a UV Light.

    My system needs are as follows:
    - External Contact Switch
    - Used to connect the system (like a button to turn on)
    - this contact will be separated and reapplied manually to start cycle again when need be
    - System needs to run for 60 seconds and then turn off automatically
    - Micro Stepper Motor (specs 6V DC and 200mA (assuming this is start-up amps) down to 20mA (assuming this is continuous running amps)
    - Run oscillating while system is on as stated by the external contact switch above (60 seconds)
    - approximately 6 seconds forward followed by 6 seconds reverse
    - exact time isn't necessary but looking to have approximately 5 full cycles for the 60 seconds run time
    - UV Light (specs indicate 6V DC and 6mA)

    - Run continuously while system is is on as started by the external contact switch above (60 seconds)

    I believe I am going to need a 555 timer, possibly 2. One to control the total time till shutoff and one to control the time to polarity switch on the motor which I also believe would require an H-bridge to switch the polarity. All of the samples I have seen show additional resistors, etc. which I am uncertain what are for and seem to be over complicating the circuit, so that probably just shows how clueless I am. Also I am thinking that polarity switch for the motor may negatively affect the light so does that mean I need another switch for polarity at the light?

    Comments to point me in the right direction or a sample circuit diagram would be greatly appreciated.

    Thanks again.
  2. jkompa


    Mar 24, 2015
    Update to request, this will use just a regular DC motor not a stepper motor so just a 2 pin connection.
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