WLED with FCOB RGBIC LED STRIP WS2812b

1

Hi,
I replaced a 5 meter WS2812b LED strip with 30 leds/meter with a FCOB RGBIC LED STRIP ws2812b with 720 leds/meter and it doesn’t work.

my equipment is:

With the WS2812b 5-meter LED strip with 30 led/meter everything works.
Did I forget to do something?

Thanks

IMG_5326
IMG_53264032×3024 2.46 MB

2

You will likely need a levelshifter.

1 Like
3

I 2nd this^^

4

Thanks for your answer, I’ll try it with a level shifter.

5

One further note, how are you powering the ESP?
If you’re using a separate 5V supply (or USB), remember to connect a ground line from the ESP to the LEDs so you have common ground for data (independent of power).

This is in addition to the proper levelshifter (don’t try and use I2C type), 74AHCTxxx based devices are best practice.

6

Ok, I’m a novice, do you have a wiring diagram? Thanks for your help

7

https://kno.wled.ge/basics/compatible-hardware/#levelshifters

scroll down a tiny bit.

8

Thank you, is this schematic correct? The schematic you linked to me has all the ports connected, is this necessary?

Thanks again for your help, thanks to you I hope to realize my project. 13 meters of FCOB 24v LEDs in aluminum profiles diffuser.

2
21557×1056 211 KB

9

That image is correct for how to connect an input/output, however it it lacking what you should do with the unused channels.

This would be the correct wiring for only using 1 channel of the shifter:

1443×974 117 KB

This shows using 2 channels:

1485×999 133 KB

  • I would put that 100nF (.1uF) ceramic bypass capacitor up at the top close to vcc. It also makes it easy to connect to ground (1OE)

Example:

20241015_192550
20241015_1925501920×1440 289 KB

*don’t worry about the resistor. It is likely unneeded. If you are running 3 conductor wire with +,-,d in one and are running at longer distances and have white flickers now n there I would try adding a 33Ω resistor.

10

Is it absolutely necessary to connect all the channels? Is it absolutely necessary to connect the capacitor?
sorry for these questions, I want to make sure I’m doing the right thing.

11

I’ve made a diagram of the installation I want to make, is it correct?

led_projet
led_projet1920×1357 147 KB

12

You’re very close, but you still need:

  • 100nF capacitor from pin14 to ground (place close to pin 14).
  • Tie pins 9,10,12,13 to ground or Vcc.

The capacitor prevents switching noise from adding flicker to the data.
If the extra pins are left “floating” they can cause also flicker in your LED data (you can ignore 8,11).

1 Like
13

Like this?

led_projet
led_projet1920×1357 152 KB

14

Are these capacitors any good?

Capture d’écran 2024-12-09 163948
Capture d’écran 2024-12-09 1639481426×837 193 KB

Capture d’écran 2024-12-09 163519
Capture d’écran 2024-12-09 1635191395×636 190 KB

Thank you.

15

That wiring will work and either of those capacitors should be fine.

16

Thank you very much for your answers and your time. I will be testing this weekend and will get back to you. :grinning:

17

Hello, I have received the capacitors, is there a wiring direction?

IMG_5331
IMG_53313024×4032 2.85 MB

18

No, those types of capacitors can go either way, they’re not polarized.

1 Like
19

Good evening, just a question about my last diagram.

Is the ground of the LEDs connected to ESP32 not a problem since the positive of the LEDs is connected to the 24V of the power supply?

Thanks

20

Connecting the ground lines together is not a problem (in fact it’s required).
Often the best way to do that for the data connection is to run a smaller data and ground wire together directly from the ESP to the strip, independent of the power wires that run to the power supply to the strip.