Correct connection of the Level switch on the RPI4

I am using hyperyon.ng on my RPI4, but I have a problem, my APA102 LEDs blink randomly from time to time. I found information on this forum, this arises from the fact that the RPI GPIO pins give out 3.3 volts of voltage, and the APA102 LED strip accepts 5 volts. This can cause occasional outbreaks. I purchased a logic level converter like this to solve this problem

But I could not figure out how I should connect it to the power circuit. Most of the pictures describing its connection assume that the RPI and the LED strip will have the same power supply, but I don't need that. I want the RPI to have its own USB power supply and not depend on the LED strip power supply. At the moment I have connections according to this scheme:

I would like to ask you to draw a diagram of how I should connect a logic level converter to this circuit so that everything works correctly and I have 2 power supplies, separately for the RPI and for the LED strip. Thank you in advance for your help!

Zitat von TPmodding

https://www.google.com/search?…w=1584&client=firefox-b-d

at least you need one common ground connection between all psu

I see that this diagram uses a common power supply for the RPI and LED strip. But I want to reiterate that I have 2 separate power supplies. RPI is not powered via GPIO. I would like to get a schematic with this in mind, thanks.

Zitat von TPmodding

it doesnt matter where your 5v comes..., you can use a second psu for that, but as i said, it is only important to have a common ground

At the moment, I have implemented a connection according to the following scheme:

But, either I soldered something wrong, or this circuit is wrong. The LED strip is not working.

I see that it differs from your circuit in that the 5 volt power to the HV pin is supplied from the power supply, and not from the Raspbeerry Pi. It is fundamentally?

Do I understand correctly that my scheme should be like this?

Zitat von TPmodding

you missed 3.3v on LV

And everything should work after that?

Zitat von TPmodding

theoretically yes

Yes it works! Thank! I think this picture should be added to the wiki and the Raspberry Pi setup tutorial to close this issue permanently on this forum!

I've always installed hyperion via hypercon, but recently the rpi4 support has been removed from the installer.
I slightly modified the installation script to pass the processor check and hyperion on rpi4 works fine for me.
In the file https://github.com/hyperion-pr…r/bin/install_hyperion.sh
replace the line

CPU_RPI = `grep -m1 -c 'BCM2708 \ | BCM2709 \ | BCM2710 \ | BCM2835' / proc / cpuinfo`

with

CPU_RPI =` grep -m1 -c 'BCM2708 \ | BCM2709 \ | BCM2711 \ | BCM2835' / proc / cpuinfo`

Zitat von vinman1000

Did this fix the blinking issue as well? I am running ws2812 with addition of an arduino that blinks so am thinking about moving to this design.

yes, the flickering has stopped, it works!

Zitat von Dan1984

Hi,

I'm pretty new to this but I followed the wiring diagram TPmodding posted for using one PSU to power strip and Pi4 and I got hyperion working. One thing I like to understand though is what is the connection between PIN1 and PIN4 for? What does it do and is it actually required for this setup?

Many thanks in advance!

This is completely unnecessary, it is enough to connect according to this scheme

Zitat von Dan1984

Thanks a lot ReWiG. I much appreciate the quick response. PIN2 only seems to go into the level shifter but then nowhere from there. Is a wire missing in the diagram?

Thanks

Everything is as it should be