WS2812B ambilight - most of leds lights only white after few minutes

Other Hardware LEDs and Multiplexing
1

Hello,

This is my new ambilight project with brand new 2812b led strip. Everything connected like in this project:

So basicly: Raspberry Pi 2 + Arduino Uno + 5V 20A DC + WS2812B. Connection to Arduino exactly like on this image: ((1000 µF, 25V capacitor and 470 ohm resistor)

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So my problem is: after one day when everything works perfect, 4/5 of my leds shines only white after few minutes ater starting ambilight. This is my 2nd led strip (in previous project I didn't use ane capacitor or resistor and most leds dies day after day...) and I have no idea what could be wrong this time. I don't want to replace the new died leds everyday :frowning:

2

Check your power supply with a multimeter. Is it really 5V?

Have you connected the grounds between the PSU and the usb power supplies?

3

Checked with multimeter many times it's constant 5V (4.99V-5.00V) on Power supply output. I'm using exactly this model: https://www.amazon.com/MeanWell-RS-50-5-Switching-99x97x36mm-AC100~240Vin/dp/B00NBLK4SS.

PaulRB:
Have you connected the grounds between the PSU and the usb power supplies?

By usb power supplies you mean Raspberry Pi? Ground it's connected only to Arduino, Led strip and capacitor.

4

guru88:
By usb power supplies you mean Raspberry Pi? Ground it's connected only to Arduino, Led strip and capacitor.

No, I just meant the Arduino, power supply and led strip, as shown in the diagram you posted.

Suggest you remove the Pi and just run some well-known test code on the Arduino to drive the strip for a few days, to help understand if this is a software or hardware problem. You could use the Adafruit Neopixel "strandtest" sketch, for example.