Low amperage PCB switch for robotics

used for a quick power disconnect of combat robotics

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A low power switch that uses a PCB and a small screw in order to make a reliable switch.

Switch is available not at my website

This is a switch I am designing to serve as a low amperage power disconnect switch.

The premise is that you tighten the center screw and the screw bridges to two copper pads causing current to move from one side to the other.

It should open and close positively without vibrating loose.

  • 1 × 1/8" Delrin Spacer
  • 1 × 4-40 Brass Nut
  • 1 × 4-40 Screw 3/16" Length
  • 2 × 2-56 Brass Nut
  • 2 × 2-56 Screw at least 1/4" Length Mounting screw

View all 6 components

  • Update #5

    Endbots10/14/2016 at 18:43 0 comments

    The switch is finally done. the larger 4-40 screw works much better. It is available now at my website and the link is in the description.

  • Update #4

    Endbots09/28/2016 at 18:50 0 comments

    I received the new boards they are much better. I will be adding photos and video soon. After a bit of testing if all goes well I will be offering these for sale.

  • Update #3

    Endbots09/01/2016 at 17:53 0 comments

    The board works quite well but I am not 100% happy with it yet. I have decided to increase the amount of contact area of the screw head by increasing the size of the switch screw to 4-40 from 2-56. I just ordered a set of boards and they should be here in a week or two.

  • Update #2

    Endbots07/18/2016 at 18:23 0 comments

    I finally got around to testing out my switch. It works quite well on my test platform for my dual motor driver speed controller I am developing. So far I have only drawn ~1 amp through it but it should be capable of much more. It is definitely suitable for most antweight (1lb) and under robots and I expect further testing to reveal it will work for beetleweights (3lb) as well.

    I need to come up with a accurate and repeatable way to test these. I am thinking about attaching them to a variable load like a brushless motor and a watt meter. Then I can measure how much current they can pull as well as how hot they get (my watt meter has a temp sensor built in)

  • Update #1

    Endbots06/23/2016 at 18:25 0 comments

    I ordered the PCB, and parts from Mcmaster Carr

    should have everything in about two weeks to test .

View all 5 project logs

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