I am building a neopixel strip project for my living room.
It consists of an Arduino Nano, 90 neopixels (WS2812B), an LM2576-5V buck converter circuit (that i have made) and an hc-05 bluetooth module. All powered through the regulator by a 12v 2a wall power supply.
The project works really well and i am ready to send a pcb for manufature. Right now everything "lives" on a breadboard (i know it's tricky for the regulator but what can you do!).
I am trying to get rid of the last glitch which happens during startup. When i power everything on i get Led #1 green followed by x leds white, then arduino kicks in and the effect i want appears.
I am using the variable x because every startup is different and i get 4,5,6 or even 10 leds white (no more than 10). This happens for about a second, and then everything goes to normal.
Now the magic kicks in!
I tried to measure the current the whole thing draws and placed my dvm in series right after the voltage regulator. With the dvm inline the effect won't happen. I don't know what the dvm circuit contains - some filter probably - but the thing stopped.
So does anyone have a clue? I am really confused here though it isn't a show-stopper, i think that it might damage the strip in the long term.