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I recently bought 1 meter of WS2818b 60 LED strip to be controlled by an Arduino UNO.

I tried to test if all the LEDs were working or not by connecting Samsung power adapter (5V, 2A) to the LED strip's VCC and ground. Only 3 LEDs lit up with green light. The rest of the LEDs did not light up.

Did I burn the LEDs? Or do the LEDs only work if I load the code?

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closed as unclear what you're asking by ThreePhaseEel, Nick Alexeev Feb 11 '17 at 1:16

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    \$\begingroup\$ These LEDs need data to work. There is no preset color. \$\endgroup\$ – Wesley Lee Feb 10 '17 at 18:02
  • \$\begingroup\$ Thanks for the response bro. Bro u mean although I connect power and ground to the led strip, the leds wont ligth up until data been send to them. Is it what you mean bro? \$\endgroup\$ – Thiyraash David Feb 10 '17 at 18:06
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    \$\begingroup\$ Yes ~bro~. :) Even if you have an Arduino with proper firmware, whenever you reset your arduino and it is bootloading, the LEDs might flash up in random color until you start sending data to the LEDs. \$\endgroup\$ – Wesley Lee Feb 10 '17 at 18:10
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After posting my comments, I remembered that I had built a setup to test PCBs with WS2812Bs.

It consisted of an Arduino, a Bench PSU and a small pcb with some jumpers and Pogo Pins, similar to this one:

enter image description here Img from http://chris-stubbs.co.uk/

Quite handy when you have to test a lot of PCBs that have no headers available (i.e. LED strips). You can also check if power consumption is within the expected using the PSU readout, etc.

enter image description here

enter image description here

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  • \$\begingroup\$ This is pretty badass! Are those PCB's conformally coated? \$\endgroup\$ – Wossname Feb 10 '17 at 22:11
  • \$\begingroup\$ Also, +1 for the clothes peg pogo-pin Frankenstein gadget. This is real world engineering at its best. Bravo. \$\endgroup\$ – Wossname Feb 10 '17 at 22:14
  • \$\begingroup\$ @Wossname -- the clothes peg pogo pin thing image is not mine, source is credited (although its very similar to the one I used, with the exception that mine was made of plastic :P). The PCBs on the last image are indeed conformally coated, nice catch. :) \$\endgroup\$ – Wesley Lee Feb 11 '17 at 0:06

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