I have like 177 leds the ws281x controlled via arduino, if I put any more than %50 brightness it flashes so I need more power, it is powered via a external power supply, my question is do I connect the other end of the led strip just the positive and negative to the same power supply line?
Connecting 5V and GND to both ends of the strip and even to intermediate points is good practice but it won't actually provide more current. What is the current rating of your external power supply ?
I assume the the external power supply for the LEDs has a common GND connection with the Arduino
Which Arduino are you using ?
at 5V its 2.4 amp, and nope it has not, ill join the ground to the arduino now then, and its a UNO
There are two issues: The LEDs can use up to 60mA each (all 3 LEDs on at full-brightness) so 177 LEDs is about 10.5 Amps. You can cheat on that a little if you don't plan-on having all of the LEDs at full-bright white at the same time but unexpected things can happen so it's not a good idea to cheat too much.
There is another issue with voltage drop through the thin conductors built-into the LED strip (also related to current = Ohm's Law). That causes the LEDs at the far-end of the strip to dim. That's solved by "injecting" power about every meter. It should be the same power supply, just with separate/fatter wires than the built-in conductors.
You need more power, period. That means you need a bigger power supply. Ideally you power the whole thing with the same supply but you will need a bigger one probably ,
did that help ? surprisingly it worked partly before you did that.
How long is the strip ?
What is the power rating for the strip ? (how many watts per meter ?)
You could power a section of it with 1 supply and another section with another, and only connect the data & GND lines between these 2 sections Not the 5v+ !!
For most strips, every 5 meters is fine.
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