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How to tell pin 1 on 4-pin push-button? — Parallax Forums

How to tell pin 1 on 4-pin push-button?

Tom FTom F Posts: 59
edited 2006-05-17 18:24 in BASIC Stamp
Can someone tell me how to tell pin 1 on 4-pin push-button?

I haven't seen anything in WAM that explains.

Thanks.

Comments

  • Tom FTom F Posts: 59
    edited 2006-05-17 15:27
    Of course I can always do a continuity test, but I'm wondering if there's a standard. There IS a semi-circle on the bottom of the device, with (as all semi-circles have!) a flat edge. Is that a standard indicator?
  • Tom FTom F Posts: 59
    edited 2006-05-17 15:31
    Ohhhh! I just was re-inserting the push-button on the breadboard after my last eye-squinting examination of the bottom and by seridipity discovered that it only fits across the gap on the breadboard in one orientation!

    I didn't notice that the first time I inserted it.

    So my question is answered!
  • RDL2004RDL2004 Posts: 2,554
    edited 2006-05-17 16:50
    I thought that with those type of buttons if you always used pins on opposite corners you would be okay no matter how you plugged it into the breadboard.
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2006-05-17 18:24
    You could look at it that way...If you place these types of switches sideways so that it's slightly longer from left to right, they're usually setup so that the top two pins are joined and the bottom two are joined.· Here is a snap from a recent PCB using any of the three similar buttons that Parallax carries.· As you can see, the bottom two go to ground, and the top two go to input lines.



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