Hi there. A while back I ordered a couple of these strips: http://www.ebay.com.au/itm/152266299098
I recently received my new 5V 40A power supply to drive these and was doing some preliminary testing tonight.
Unfortunately, using both FastLED and the Adafruit Neopixel library I can only get the LEDs to light up red. Attempting green or blue just leaves them off. For example, the Neopixel “strand test” example sketch runs through just fine but only with the red “channel”.
Now, some thoughts on what may be going wrong:
- These strips actually need 12V DC instead of 5V (i.e. title of the listing was incorrect about input power) and given red has the lowest voltage requirement it’s the only one that CAN light up. I do have two strips and technically only need one so I can try to track down a 12V power supply to do some basic testing, potentially blowing out one of the strips. The strip itself does have “12V” on the +V line (see last image in listing)
- Both the strips are busted in exactly the same way (seems unlikely)
- I actually got sold 5050 red LEDs, not RGB
I’m just looking for some insight from those more experienced with these things before I damage anything and/or for tips on further troubleshooting. I’ve attached a photo of how everything is wired together, it’s pretty simple. That’s a 220 ohm resistor plugged into the breadboard.