Adafruit NeoPixel NeoMatrix 8x8 only displays RED color

I bought a NeoMatrix 8x8.
I install all the needed libraries, everything works well but the LED only lights in red color.
I run the strandtest code to exclude any other bugs, which perfectly work, but only with the red color.
As soon as I put a blue or green color (strip.Color(0, 255, 0) or strip.Color(0, 0, 255)), no leds are lighting up...
Any advice?


How are you powering the matrix? It will need almost 4A at 5V. That's way too much for the Arduino's 5V output.

I know from running small strips of neopixels using 3xAA cells that as the cells discharge and their voltage drops, the red led within each neopixel is the last to remain lit. Blue stops working first, then green and finally red.

What voltage do you measure accross the matrix's power connections?


Thanks Paul, I have a 5V 3A alimentation, but I did not check the voltage. You are probably right. I’ll keep you inform.

Now it’s working, voltage issue. Many thanks Paul