I have WLED installed on a ESP8266 NodeMCU, with regular Dupont cables connected to some wago’s which connect to some 26 AWG cables and they connect to the LED’s.
My LED’s start blinking sometimes and then i reconnect the cables and reset multiple times until it works.
I have tried reconnecting the wires multiple times. I think i need thicker cables like 18AWG or something like that, but i am not sure
Do up a basic drawing of how you’ve wired this together.
What are you using for a power supply?
How many LEDs, what voltage are they and what type?
How long is the data cable from the ESP8266 to the LEDs?
Ok, that drawing will work,
Can you measure the power supply voltage at the start of your strip and then at the end?
What happens to the blinking if you drop the brightness of your strip down to 40%?
Do have proper control of the RGB colours, they just blink or flicker?
Likely, a bad connection then.
The original Dupont connectors are famous for that.
Getting the levelshifter(s) is still not a bad idea, eventually you’ll find a need for them especially if your data line gets longer.
If you really have a barrel jack connected. I would remove that and just use the wires. You will melt that if you try to send anything near 10A through it. It will likely fail at 5 or 6A.
I would also do away with the dupont’s and get some male pins and solder wires to them or female w/e your setup requires.