How to control a WS2812 LED Strip with a Raspberry Pi in Python

***** READ DESCRIPTION BEFORE WATCHING VIDEO *****

The code should still be the same as in this video.

Materials used in this video:

The wiring goes as follows:
5V pin on the Pi goes with the 5V pad on the LED strip
Gnd pin on the Pi goes with the GND pad on the LED strip
GPIO pin 18 goes with the DI pad on the LED strip

How to support the channel:

Social media links:

0:00 Wiring setup
0:38 Writing a Python script
6:50 Running the Python script

#raspberrypi #ledstrip

[Flopperam]

READ COMMENT BEFORE WATCHING VIDEO


The code should still be the same as in this video.

[ikornn]

I've waited so long to figure this out. You are a saint good sir.

[nsvaluto]

Hard to heard hear so soft in the audio of your video, what's the package to install and were is it found? Thank you

[jamespark]

Hi could I please get some help. I’ve followed all the steps you have shown but I’m getting the wrong colours. There’s three distinctive problems. Firstly if I set rgb value to 255, 255, 255 - should give me white but it actually gives me blue. And when I run the whole loop of the stripes, it only displays like 8-9 LEDS when in fact I have looped for the whole 120 LEDS. And also the colours for each LED is different even though I followed exactly the same as ur code

Would this just be wiring issue? Pretty sure I’ve followed everything you displayed. Any direction would be very appreciated

Thank you

[malcbear]

this is probably a silly question, but I'm a complete novice at this. So can this all be ran through a raspberry pi pico instead?

[camsmart]

Yo I have a question. If I connect more than one strip should I daisy chain them together or can I use more than one pin and then setup the respected pins in the code.

[Th_RealDirtyDan]

I keep getting "ModuleNotFoundError: No module named '_rpi_ws281x'". Any tips on how to fix this?

[olgaliciarubio]

Hello @Flopperam, I have a problem, I'm using Raspberry PI3 and the code works only if I run it by the terminal with the command SUDO Python3 .... but if I try to run it from other code Editor it does not work...
RuntimeError: ws2822_init failed with code -5 (mmap() Failed).
I'm using "headmelted" as my Editor. Do you know how can I fix it?

[bhunt]

Hi I have a 5 pin led strip, where instead of the din pad on the led, it has 3 separate rgb pads. Would this still work if I sauder those rgb pads together and then connect them all into the 1 pin on the raspberry pi, just like the din cable?

[chellochamber]

My led strip is rated 5 volts, 30 leds per meter, and 9 watts per meter, what external power supply should I get? I’m new to this sort of stuff.

[andrewm]

Did you have to enable any interfaces? I assume yes.

[clintla]

Is there any code on how to address each LED individually? say the first 5 one color, the next 5 another color?

[unknown-hinb]

If the led strip is 5 volts, is it still unsafe to use the 5V pin?

[theonecommenter]

is there a way to use a 3B+ to wirelessly control the multiple lights though wifi

[ismaelmalik]

Its saying 'can't open /dev/mem:Permission denied' when I try to run it in python. Also all of the leds aren't coming on or changing colour and only one led is on. I have tried changing the light strip but still no luck I am sure the wiring is all correct and running code in the terminal is correct. Pls help

[Jad_zor]

Hey dude, I followed the video, but regardless of what I change the RGB values to, all of my LEDs just go bright white. Any idea on where i'm going wrong? My code is exactly the same as yours.

[chellochamber]

Im getting error messages that say
Can't open /dev/mem: Permission denied
Traceback (most recent call last):
File "/home/pi/Desktop/Led Strip Control.py", line 14, in <module>
strip.begin()
File "/usr/local/lib/python3.7/dist-packages/rpi_ws281x/rpi_ws281x.py", line 131, in begin
raise RuntimeError('ws2811_init failed with code {0} ({1})'.format(resp, str_resp))
RuntimeError: ws2811_init failed with code -5 (mmap() failed)
What am I doing wrong?

[trailsanddales]

Hi i copied your code and changed led to 60. When i run the code they light up red white blue red white blue all the way through. I then amended your code and changed the brightness to 0 to turn off the leds the first 45 turn off and the last fifteen stay lit up. Does anyone know whats going on? thank you

[BiDude]

so how can you know what channel to use?

[Dzh]

Hi,
When I run script it show me error
That's script.show()
Is not a valid Syntex