I have the following 5V LED strip (WS2812 30 3m): https://www.aliexpress.com/item/1005006165044898.html . I tried powering the LED strip with a separate 5V power supply while powering the ESP-32 via its USB connection (connected to another USB power supply). While the LEDs came one, I could not cont…

[image] ZuluPilgrim: All this does not make sense to me as I would have thought a separate 5V power supply for the LED strip should have worked. You likely forgot to join the grounds together.

In addition to @kirah’s mention of common grounds (absolutely required) you likely will need to add a proper levelshifter as well. Be forewarned: running your LEDs off the 3.3V supply from your board is not recommended, that supply is probably not able to supply much current before overheating and/…

Thanks both for this. Just to make sure that I understand correctly. I only need the logic shifter if driving the strip from the 3V pin on the ESP32. If I drive the strip from it’s own 5V source then I just need to join the grounds? Is this is correct then is a separate 5V source better than using …

You should have a level shifter either way. The Esp only outputs 3.3v data from it’s gpio pins. LEDs look for 5v data. The level shifter will boost the 3.3 to 5v. You may be able to get away without one but one is recommended. Not all LEDs are created equal and while some may be more tolerant to und…

Thanks again, just two more questions. In the schematic below I see the ESP showing a 3.3V and 5V link to the level shifter. Am I reading this correctly and if so what if the ESP does not have a 5V out? [image]

Last question. I am wanting to try make my own custom board. Googling, I found the following 3.3V to 5V shifter. [image] I understand the input, output and ground. What I can’t work out is where does the 5V on the exit side of the R1 resistor goes. Also, is there may be a better way to build a log…

[image] ZuluPilgrim: what if the ESP does not have a 5V out? Well you’re supplying 5V to the board, it’s the same 5V that goes to the shifter. [image] ZuluPilgrim: Also, is there may be a better way to build a logic shifter? https://kno.wled.ge/basics/compatible-hardware/#levelshifter…

Some shifters use 3.3v and 5v. Just use the SN74AHCT125N it only needs the 5v. If your Esp has a pin labeled VCC that is 5v.

[image] Jinx: SN74AHCT125N I like the SMD formfactor of the BSS138. Based on all the diagrams, I get the below. Have I done this correctly? [image]

5V LED strip only works properly off of 3V

Hardware

ZuluPilgrim November 20, 2023, 2:08am 16

While I wait for confirmation to the above, how would I connect the SN74AHCT125N?

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5V LED strip only works properly off of 3V

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