EEVblog Electronics Community Forum
Electronics => Beginners => Topic started by: msknight on June 21, 2021, 06:45:58 am
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I know what I'm looking for... I just can't work out the terms I need to find it.
On a joystick, I want a button/switch to mount on/in the joystick board, which allows me to invert an axis. Under normal operation, feed 1 goes to A and 2 goes to B. When "switched" feed 1 should go to B and 2 should go to A. Hence effective inverting the axis.
But I can't work out the terminology I need for that kind of switch. Any ideas please?
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DPDT does the trick of "swapping" two connections.
https://www.digikey.de/products/en/switches/toggle-switches/201?k=dpdt&pkeyword=dpdt&cur=EUR&lang=en (https://www.digikey.de/products/en/switches/toggle-switches/201?k=dpdt&pkeyword=dpdt&cur=EUR&lang=en)
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You need a DPDT (double pole, double throw) switch, also known as 2P2T switch. See https://components.omron.com/pole-throw for explanation of poles and throws.
Wire it as a reversing switch, i.e. cross link pole A NC to pole B NO, pole A NO to pole B NC, then run the pair of connections you want to reverse through the switch, on one side connecting both to the A and B COM terminals, and on the other to the two linked pairs of NO and NC terminals.
If you want to use a pushbutton it will need to be a latching switch, not a momentary one.
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There are 2 basic configurations of DPDT switches. Some have a center position ("off"). Others just switch between the two options. In addition, some hold the new position (i.e., there are 2 stable states) ; others are momentary on one state.
I suspect you want an on-on version. Maybe this will do: https://www.digikey.com/en/products/detail/nkk-switches/YB26WCKW01/2107465 (https://www.digikey.com/en/products/detail/nkk-switches/YB26WCKW01/2107465)
EDIT: make that on/on "or on/mom" (momentary)
If size is an issue. a single SPST momentary switch will probably be smaller and that could operate a DPDT relay.