24v COB rgb 840 strip controled by Raspberry Pi

I am having a hard time figuring out the solution to controlling my 24v strip with my Pi 4. I have a 4 pin strip with R. B. G. Bk wires. I think a N-channel MOSFETs transistor will fix the communication issue and allow control of the colors. most Ara fruit software I have seen is for addressable Leds with only 3 leads. R. Bk. and Green. Am I on the right track with using the transistors. If so Why? is there an easier way? I am making a bay blade stadium for my son and want to incorporate buttons with lights and sound..

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fskrzycki 2 months ago

I only want to have 1 power supply for this Project. Can I use a LM2596 DC-DC Buck Converter to provide power to my 24v LED strip and power to my Raspberry pi.

I think will have to split off the wires from my current supply to feed into the new controlling Circuit powering the Strip before feeding into the buck converter. I would also need to strip a USB-A extension cable so I a viable connection for the USB-A to USB-C cord that connects to my Ras-pi

I'm not sure what complications if any could be involved.

please advise
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shabaz 2 months ago in reply to fskrzycki

The LM2596 modules look a bit risky. It might cause brownout of the Pi 4, or could damage it.

Disclaimer: I've never used that module, so I'm speculating, but I don't get a good feeling about them visually. The feedback isn't universally good: https://www.eevblog.com/forum/reviews/lm2596-dc-dc-step-down-modules-load-testing/

Plus, the Pi 4 has more difficult to achieve supply requirement than a Pi 3B.

It could be better either switching to a Pi 3B, and/or using a board such as these ones:

https://www.pololu.com/category/261/d36v28fx-step-down-voltage-regulators

No need to source a USB cable to strip; the power can be applied to the 5V pin on the 40-way connector on the Pi.
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shabaz 2 months ago in reply to fskrzycki

The LM2596 modules look a bit risky. It might cause brownout of the Pi 4, or could damage it.

Disclaimer: I've never used that module, so I'm speculating, but I don't get a good feeling about them visually. The feedback isn't universally good: https://www.eevblog.com/forum/reviews/lm2596-dc-dc-step-down-modules-load-testing/

Plus, the Pi 4 has more difficult to achieve supply requirement than a Pi 3B.

It could be better either switching to a Pi 3B, and/or using a board such as these ones:

https://www.pololu.com/category/261/d36v28fx-step-down-voltage-regulators

No need to source a USB cable to strip; the power can be applied to the 5V pin on the 40-way connector on the Pi.
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fskrzycki 2 months ago in reply to shabaz

finished circuit, fingers crossed.
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fskrzycki 2 months ago in reply to fskrzycki

Hey Shabaz,

I connected all the zero volt grounds on tbe Zenner Diode side to the Power Supply Ground.

I am seeing a large decrease in brightness when GPIO PIN IS SET High.

I am able to control color frequency. so the optocoupler works! awesome!

unfortunately, I still have a leak because they gradually get brighter.

I lowered the resistance after the optocoupler on the diode side to. 10k. no change.

the leak must be on the diode side. Any suggestions?
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