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Hello, i have some problem light my leds. I'll try to give as much information as i can. I’m a beginner, but I did my research before making this post. My setup :
Sofware :
Here is some picture of my installation.
I try to perform a debug test and this is what i got : And last thing, here is the logs :
I checked to ensure I have 5V everywhere on my LEDs. That part is fine. I would be very grateful for your analysis and the time you spend helping me. Thank you by advance |
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Replies: 8 comments 21 replies
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Hi As for the TXS0108 level shifter: https://kno.wled.ge/basics/compatible-hardware/ NOT recommended! |
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I also don't know how it's all connected to the leds or even if there's a common ground there, are there two segments or one, are you using GPIO14 (and possibly 15)? Connect the data signal without a level shifter to the leds using a short cable. |
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First, let's check the equipment itself.
Download the test firmware attached below to RP2040.
If all connections between elements are made correctly, then in your case the tape will blink blue. |
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Hello, First of all, thank you @awawa-dev and @AstaRom for your responses and for taking the time to help me. Special thanks to @awawa-dev for replying so quickly, it’s much appreciated! To provide more details for your analysis: Next, I’ll try the steps you both suggested: I’ll follow up within one week with the results once I’ve gone through these steps. Thanks again for your help! |
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It is advisable to use:
It is also possible to use the 'SN74LVC2T45'. |
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Hello again, It's been a while since I last worked on this project, but I’ve recently picked it back up and ran several new tests.
Then, based on your recommendations, I replaced the TXS0108 level shifter with a SN74AHCT125N, but again, the LEDs still did not light up. At this point, I’m a bit lost. Here’s a quick summary of my setup:
I have double-checked my wiring multiple times, and it matches exactly the wiring diagram I shared earlier in this thread. Is there something wrong in my wiring, or could the way I’m powering the strip from multiple sides be causing issues with the data line? Any insight or suggestions are greatly appreciated. Thanks again for your time and support! |
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The attached photo is of poor quality, but at least in this segment it now seems that you have connected the data source from the wrong side, against the required direction. Moreover, even if everything is connected correctly, do not forget that this is the 144 leds/meter version, which has a huge appetite for current. It is possible that the power supply protections are activated. Check the 5V voltage with a multimeter and with the setup turned off, whether there is a breakdown/short-circuit between the 5V/data/ground lines. |
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You're absolutely right ! All segments are correctly connected with arrows aligned in the same direction, except for the data input, which I mistakenly connected in reverse. As for the power side, I’m using a 5V 40A power supply, and I’ve also added fuse holders as a protection. I double-checked with a multimeter and I do have a solid 5V reading directly on the LED strips. Thanks again @awawa-dev for pointing that out, especially during the weekend. I really appreciate the quick and helpful response. I’ll fix the wiring direction and run the tests again. I'll follow up soon with the results! |
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In this case, the problem is either in the correctness or in the quality of the connection between the elements (rp2040 -> shifter-> led). To check, you don't need anything except: rp2040, shifter (SN74AHCT125N), LED's strip, power supply. Disconnect everything else for now and do not use it, and accordingly, the firmware from the post above in the discussion. Once you assemble these elements, attach a photo and we will visually check the correctness. |
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The wiring is done as requested: Raspberry Pi → RP2040 → shifter → LED strip. Here are some photos of the setup. Please don’t judge me, the wiring is still a bit messy and temporary The RP2040 The level shifter The LED strip Everything looks correct to me, but I must be missing something. I checked directly on the LED strip and confirmed that 5V is present. thank you for your help! |
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I tested again with the test.14.15.pin.zip firmware, but still nothing lights up.
At this point, I think I may have damaged the shifter with my previous incorrect wiring. Thanks again for your help and detailed guidance! |
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Green wire (Data from rp2040) directly bypassing the level shifter, have you tried connecting with text firmware? |
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Yes, I connected the following setup: I also previously tried bypassing the shifter with this configuration: |
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The test firmware does not require a Raspberry Pi. Only RP2040, LED strip and power supply. The fact that you had several LEDs blinking by accident may be due to the level shifter. But the fact that the strip did not light up with the above scheme is abnormal - the problem here is not in the shifter. |
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The level shifter is needed for stable operation of the tape, to avoid these spontaneous blinks (usually a couple of diodes at the beginning). If your tape does not work without it, then you need to look at the RP2040. We have verified that you are recording the firmware correctly. But is the driver itself working? |
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Here is a quick summary of what I’ve tested so far: Configuration : 
Unfortunately, I must have been mistaken earlier, nothing happens at all now. Do you think this could mean my RP2040 Zero is damaged, or is it more likely that there's still a wiring issue on my side? Thanks again for your time and help! |
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Yes, I have this model and it definitely should work although only with HyperSeriaPico, because it lacks pinout for HyperSPI. |
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Hello again, I just received my Plasma Stick 2040, and I’ve done some tests with it.
Just to clarify again, my LED strip is WS2812B Unfortunately, I’m still not able to light up the LEDs 😞 To simplify things, I reduced my setup to the minimum. T
I did not connect 5V from the Plasma Stick to the LEDs — the LED strip is powered separately with a dedicated 5V power supply. I’ve attached some pictures of the wiring so you can better understand the current setup. Here is my configuration in hyperHDR : And here is the logs :
Let me know if anything looks off or if there's something else I should try. Thanks again for your continued support! |
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Hi or damaged first leds. I think its time to take apart carefully the isolation there and using continuity mode on the multimeter check if there is actual connection between data/ground on the LED and the rp2040. You can also have a short-circuit at the LEDs begining (measure a resistance between ground/data/5v). Otherwise I have no other ideas. |
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You were absolutely right ! the first LED was faulty. |
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You were absolutely right ! the first LED was faulty.
I cut it off and resoldered the wires to the next LED, and now it’s working like a charm!
Thank you so much for your time and your help @awawa-dev and @AstaRom !