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Old 10-05-2014, 03:48 AM #1
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Default Push button help

Hello all. For a new build I am using an LED pushbutton and to test everything out I hooked everything up but for some reason the switch lights but the LED I connected it to does not when I push the button. I have looked for a datasheet to no prevail. I have tried every single combonation for the out LED and none work, yet I plug it in and it works fine

The pinout is:
C1(ground) NO1 NC1
+input -input





What is going on here?

PS: Sorry for terrible pics my phone is a 3mpx

Also I hooked this up on a breadboard which did not work either.



Last edited by upaa27; 10-05-2014 at 03:49 AM.
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Old 10-05-2014, 04:02 AM #2
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Default Re: Push button help

Hard to see what's going on. Can you draw a quick diagram of what you're hooking up?
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Old 10-05-2014, 04:04 AM #3
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Default Re: Push button help

where did you connect the LED pins?
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Old 10-05-2014, 04:18 AM #4
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Default Re: Push button help

Is that wire actually soldered, or have you just wrapped it around the pins? It looks like enamelled copper wire to me, which has an insulating coating you have to scrape/melt off and solder before you'll get a reliable connection.

Also assuming that is a LiIon cell, it doesn't seem like you have a resistor on the LED. It may be OK if it's a blue or white LED, but any others will burn out (and still risky with blue and white LEDs, too)
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Old 10-05-2014, 04:38 AM #5
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Default Re: Push button help



sorry its sideways.

Last edited by upaa27; 10-05-2014 at 04:39 AM.
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Old 10-05-2014, 04:44 AM #6
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Default Re: Push button help

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Originally Posted by Things View Post
Is that wire actually soldered, or have you just wrapped it around the pins? It looks like enamelled copper wire to me, which has an insulating coating you have to scrape/melt off and solder before you'll get a reliable connection.

Also assuming that is a LiIon cell, it doesn't seem like you have a resistor on the LED. It may be OK if it's a blue or white LED, but any others will burn out (and still risky with blue and white LEDs, too)
I don't care to much about the led its just for testing. The is from the core of 24 gauge and is conducting into the button which is why the button's led is lighting up.
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Old 10-05-2014, 04:44 AM #7
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Default Re: Push button help

If your power source is actually 12V, then you've probably cooked your LED. Chances are the one in the switch has it's own resistor. LED's need current limiting just like laser diodes - they're just not as finicky
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Old 10-05-2014, 04:47 AM #8
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Default Re: Push button help

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Originally Posted by Things View Post
If your power source is actually 12V, then you've probably cooked your LED. Chances are the one in the switch has it's own resistor. LED's need current limiting just like laser diodes - they're just not as finicky
LED is still lighting when hooking up directly and supply voltage is around 3.7v

Last edited by upaa27; 10-05-2014 at 06:13 AM.
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Old 10-05-2014, 06:16 AM #9
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Default Re: Push button help

*bump*

Thanks for your replies guys just really need help on this.

Do you think the button is a dud? I feel like the LED in the button wouldn't be lighting up of something internally blew but it hasn't. There is no reason this shouldn't work.
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Old 10-05-2014, 06:20 AM #10
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Default Re: Push button help

Maybe disconnect the LEDs and rub the two wires coming out of the switch together to see if it sparks.
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Old 10-05-2014, 06:33 AM #11
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Default Re: Push button help

Tried it. No sparks.
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Old 10-05-2014, 07:47 AM #12
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Default Re: Push button help

you got it wired wrong. The + and - is for the button LED.

common is connected to NC (normally closed) when button is released, COM is connected to NO (normally open) when button is pressed.

connect your load LED - to battery neg, connect batt + to switch COM and load LED to NO so it will light up when button is pressed.

If you connect the LED to NC, the LED will light up continuously and turn off when button is pressed.
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Old 10-05-2014, 08:06 AM #13
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Default Re: Push button help

Quote:
Originally Posted by upaa27 View Post
Tried it. No sparks.
Quote:
Originally Posted by djQUAN View Post
you got it wired wrong. The + and - is for the button LED.

common is connected to NC (normally closed) when button is released, COM is connected to NO (normally open) when button is pressed.

connect your load LED - to battery neg, connect batt + to switch COM and load LED to NO so it will light up when button is pressed.

If you connect the LED to NC, the LED will light up continuously and turn off when button is pressed.
Yeah I was thinking that either the switch was bad or it was wired wrong.
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Old 10-05-2014, 05:25 PM #14
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Default Re: Push button help

Problem solved! Thanks man!

+rep
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