Direct connection ws2812b to RPI3 or use Arduino pro mini

I've done both with good success.

A 2812 can de used directly with either the ws281x or ws2812spi led drivers.

I've also written a small arduino avr program to take SPI data and resend it as 2812 data

Have you looked at the wiki ?
https://hyperion-project.org/wiki/3-Wire-PWM
I have yet to document abusing the SPI bus yet.

My SPI to ws2812 stuff is here
https://github.com/penfold42/stuff/blob/master/README.md

I've never bothered with level shifters - I had some minor corruption on one strip that the level converter didn't fix - turns out my wemo controlled fluorescent lights were causing interference

For the 281x driver I don't think so - it bypasses the kernel and hits the hardware directly

For the SPI options, you may need to look at http://wiki.openelec.tv/index.php/Config.txt

Hello!
I have ws2812b strip led and I'd like to set an ambilight for my TV. I checked on internet and I saw that for this type of LED strip you need an Arduino to run. However, I algo found this Hyperion wiki explaining how to set without an Arduino. I did all the things described but I get an error and it is shown when I boot raspberry:

ssh in: May 17 20:51:43 osmc-Theophilus systemd[1]: Failed to start Hyperion Systemd service.
ssh in: May 17 20:51:43 osmc-Theophilus systemd[1]: hyperion.service: Unit entered failed state.
ssh in: May 17 20:51:43 osmc-Theophilus systemd[1]: hyperion.service: Failed with result 'signal'.

I really really wish to use just raspberry without Arduino, but I don't know what to do.. Please, anyone know what's going on? I attached the config file.

Please! Help me!

I got it working using WS281X-SPI and set force_turbo on! But half of the LED Strip is ON, does someone know why???? I am using 5v 20a 100w power supply for the LED Strip

Wiring issue is the usual cause.

How long is the strip ?
What OS are you running ?

A more obscure cause is the default maximum dma transfer size

Zitat von penfold42

Wiring issue is the usual cause.

How long is the strip ?
What OS are you running ?

A more obscure cause is the default maximum dma transfer size

Hi! Sorry for long time no reply. The one led was broken :))

I have another issue now!! I am using a 5v 30a supply and I want to power the LEDs (about 150) and the Raspberry together. So I plugged the LEDs and the Raspberry together but Raspberry is showing a "lightning" icon that means that I am powering less than 5v. If I disconnect the LEDs, Raspberry works without the lighting icon. So the LEDs are draining the 5v? Is there a way that I can supply in this way without drain 5v for Raspberry?

PS: I am not powering the Raspberry to GPIO, I am powering to mini USB

Thanks again!

Hello, can you send us the hyperion conf file for the WS281X to work?

I've added on the pin 8 (GPIO 14 TXD) the converter level and then connected to the data in of the led strip.. but the leds don't light, what am I doing wrong? I am just testing hyperion + rpi3 + leds, no video capture yet.

Works for me, I just tried it quickly. Pi 3, just the LEDs with a 100 ohm resistor. I used GPIO18.

"device" :
    {
        "name"       : "MyHyperionConfig",
        "type"       : "ws281x",
        "leds"     : 39,
        "colorOrder" : "grb",
        "gpio"  : 18,
        "dmanum"  : 5,
        "freq"  : 800000,
        "pwmchannel" : 0
    },

No way, what you using OPENELEC?

I am so pissed, wasted days now to solve this, I have it same as you have it and its not working.

Its some software issue here, must be.. can you tell me exact versions you use?
I have Rasp pi 3 B

Funny if I have MyHyperionConfig in "name" I get cannot connect to host.

If I have "name" : "MyPi", it connects but has other issues..

how is your config.txt looking like?

I use Hyperion directly on a Stretch Lite image, I use HDMI Input, no media player or anything on it. For the test, I used a Pi 3 B, latest hyperion and hypercon.

config.txt just has
max_usb_current=1
dtparam=spi=on
added.

Try this image, it contains a fully set up hyperion (still need to config it properly):
[MEDIA=googledrive]1P5EYPAGexLDlyfdXKSOLKifzUr00K35c[/MEDIA]

For testing, I literally just flashed the image, sent the hyperion.config.json to the proper folder, and it worked.

Ok, thank you a lot, will test it tonight!

Do you have default user/password for root?

pi/raspberry.