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NOT WORKING - Flexible RGB Neon-like LED Strip 120 LEDs - 1
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NOT WORKING - Flexible RGB Neon-like LED Strip 120 LEDs - 1

by kevishu on Mon Dec 16, 2019 11:35 am

Hello,

I've recently received the "Flexible RGB Neon-like LED Strip 120 LEDs - 1 meter long PID: 4245" but when I powered it using an external 12V power supply, none of the colors light up. I've tied the BLACK wire to ground, and tried powering the individual colored wires separately, but no current is drawn. I would like to get a replacement sent immediately, but would prefer it gets checked prior to shipping to rule out a bad batch of these flexible strips.

Thank you

kevishu
 
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Re: NOT WORKING - Flexible RGB Neon-like LED Strip 120 LEDs

by dastels on Mon Dec 16, 2019 12:21 pm

The black wire on this strip has to be connected to +9v or +12v. Grounding the other (red, green, and blue) wires will turn on the associated color of LEDs. See https://learn.adafruit.com/rgb-led-strips for more information.

Dave

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Re: NOT WORKING - Flexible RGB Neon-like LED Strip 120 LEDs

by adafruit_support_carter on Mon Dec 16, 2019 8:53 pm

Also, from the product page:
https://www.adafruit.com/product/4245
You'll get 1 meter long strip with 4 wires: black for +12V and then red, green and blue that you can connect to ground to turn on the corresponding color.

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Re: NOT WORKING - Flexible RGB Neon-like LED Strip 120 LEDs

by dastels on Mon Dec 16, 2019 10:39 pm

Yes, and then you can PWM the color wires through darlington transitors or FETs. This is described in the guide I linked.

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Re: NOT WORKING - Flexible RGB Neon-like LED Strip 120 LEDs

by kevishu on Mon Dec 16, 2019 11:37 pm

Oh man, totally missed that! I always assume black to be negative/ground. Thanks guys for straightening me out on this. I just tested this and, YES, it all works fine now.

Thanks!

kevishu
 
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Re: NOT WORKING - Flexible RGB Neon-like LED Strip 120 LEDs

by dastels on Tue Dec 17, 2019 9:54 am

Yeah, black as ground is a very common convention. Normally I'd expect red to be power, but in this case red is one of the control lines (for the red LEDs). I probably would have went with white for the power line, personally.

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Re: NOT WORKING - Flexible RGB Neon-like LED Strip 120 LEDs

by kevishu on Tue Dec 17, 2019 10:13 am

I absolutely agree that WHITE would have been a better choice, as it would've at least made me double-check the webpage for hookup information. I don't think I've ever seen BLACK be the power, other than being the "hot" wire in A/C house wiring. Anyway, still my bad for not at least carefully reading the product page more closely before assuming I had a faulty product.

kevishu
 
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Re: NOT WORKING - Flexible RGB Neon-like LED Strip 120 LEDs

by adafruit_support_carter on Tue Dec 17, 2019 1:31 pm

Yeah. Glad it was that simple and the reverse connection didn't damage them. What a silly color choice for that wire!

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Re: NOT WORKING - Flexible RGB Neon-like LED Strip 120 LEDs

by dastels on Tue Dec 17, 2019 1:36 pm

The moral of the story here is to never make assumptions when dealing with electronics. Generally speaking there are no rules for things like wire color, just conventions.

Dave

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Please be positive and constructive with your questions and comments.