I ll use 4x2.5m ws2812b Led. Using 5v10a powercase.I ll connect + - led connections to power case and din to arduino pins for 4 leds. On the photo it make second gnd connection to arduino on the same black cable to led gnd.should i do that and if i dont will anything happen? Shortly can i control my led ony make 3(+-,din) connections.
Welcome to the forum
It is important that the Arduino and the LED strip share a common GND connection in order that there is a common pint of reference for the voltage level of the data signal from the Arduino. If you don't have such a common GND connection then the LEDs will not behave as you want or expect
Your diagram seems to show such a connection and is, therefore correct
4 strip led each 2.5m. 5m has 150 led so 1 strip led ll be 75led each of 4
Totally 300. I ll control 75-75-75-75 by using arduiono.
Must i do the that second gnd connection. Or can i use my 75led to only connect + - and arduiono pi(din).
The Arduino and the strips must have a common GND connection. Why don't you want to do that ?
i want to do like this cause this is basic and will not be that much cable on the box. It ll seen more organised. Thats why but i ll not use 6led as the photo i ll use 75led so thats why i ask
Ok one more questions i ll do that common gnd connection as LarryD shared photo on top. Can i do that with breadboard?
Ok so must do the what u shared before right. I asked it but ll write down again can i make it with breadboard right that arduino led gnd connections and led powersupply connection. I think i ll be more organised right?
If you wire the circuit as below, the Arduino GND to the power supply GND can be through a breadboard.
Thank you guys so much <3
Be very wary of using a breadboard due to the amount of current being used. You have 300 LEDs, each of which will take about 60mA when set to white at full brightness. That is a potential total current of 18A. If that much current passes through a breadboard then it will melt
I am sure that you are going to tell me that all 300 LEDs will never be full on white, but accidents happen
If the power to the LEDs does not go through the breadboard then you will be OK to use one as the control signal uses very little current
Does your description match the advice given?
You need a common ground. The reason is
Notes:
You are over complicating this. Both reds are connected together and both whites are connected together on the strip.
So one white to arduino GND and another white to PSU negative. One red to PSU positive. Green to arduino signal pin. If you want to power arduino from that same PSU, other red to arduino 5V pin. No need to wrap or jumpers.
They have that kind of wiring, because just with that din connector you can have a working circuit with controller. If you need to provide more power (like your case) you use those other two wires for additional PSU.
ps. if you want to connect to arduino with jumper cables, they usually fit well in that black connector pins.
