Replies: 4 comments 41 replies
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Hi |
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ok, thanks for clarifying the +5V. Just to be clear ... the GND on the LED will connect to the V- coming off of the power supply? That same V- is what connects to the Pimoroni, right? Would it go to the "-" terminal? or do I solder a pin into one of the two spots marked "GND"? Or no difference? Also, could you clarify the question about the "closed loop" part of the LED in the schematic above? |
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yes, if v- and v+ looks like this then v- is GND for the LED |
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Thanks, and yes the power supply is like what you've shown. |
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Sorry, just coming back to the ground connection — the ground from the power supply is supposed to connect to the “-“ screw-down terminal along the short side of the pico …. not the GND along the long side of the pico .. am I correct? |
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yes, to the minus screwdown terminal (in fact probably doesn't matter, the ground on the Pimoroni board is probably common) and to the LED strip ground. |
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thanks! Got everything all connected up, while the LEDs are still on the reel. I wanted to make sure before I started cutting and sticking them on, that they were functional and I got it all connected up correctly. I see that all the LEDs have turned on and are changing colours ... however, I've not been able to determine whether everything is working correctly tho. I tried using the "identify" function in the LED layout to find the flashing LED but can't seem to correctly locate it on the reel (I tried to identify various ones that are close to the front for ease of locating). I also tried to figure out how the LEDs are "commanded" to utilize / output the video grab colours versus whether or not there's some way of just commanding all the LEDs to turn into specific colours just to verify. I also have this instance added as an integration to Home Assistance, but when I use that to turn on/off the LEDs, it doesn't seem to react to the switching on/off. Anyways, any words of wisdom or advice to help verify correct installation on my part would be very much welcome! edit: here it is setup temporarily behind the wall of the TV it is eventually going to be mounted to:
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I cant see how it's wired to Pico. You have to carefully test LEDs on the reel when it is not difficult to short circuit. First check if you have communication with HyperSerialPico (described for esp but you carry out the test identically): https://www.hyperhdr.eu/2023/02/ultimate-guide-on-how-to-build-led.html#chapter9 |
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also wanted to include a few screens of the config: Live View shows my HDMI output to the system is working: I also was playing with the "remote control" and gave it a "breathing" effect, and the output does seem to show correctly. This is all good in theory ... except none of this shows up on the LEDs in real life :( |
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Wait! Did you connect Pico to the earth? Disconnect it before something bad happens and connect it to the v- (LED ground). And perform the test I linked to. |
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Sh!t ... yeah, I connected it to the wrong terminal on the power supply even though further up you told me which it should go to. I unplugged and reconnected it correctly and actually everything lights up correctly now! I'm still trying to figure out the test you linked to tho .. just for sanity check |
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If it works, you don't have to do this test. Using earth simply won't replace the proper GND, although it shouldn't damage anything because it's very very low current, but it's better not to do it because the current can find a path somewhere else. Such mistakes usually end tragically if you use an oscilloscope ;-) Usually, the RPi power supply doesn't have a connection to earth anyway but the current may found a patch through USB grabber -> TV/amplifier -> earth. |
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gotcha ... now that everything seems to be working, then comes the scary part of cutting up LEDs .. haha appreciate all the input and help setting this up! will post results once everything is all wired up and mounted into position! |
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Reporting back in, I mounted all the LEDs to the back of the TV (and the TV is wall mounted!!) and the lights don't turn on .. hahaha Unmounted the TV and then started testing all the wiring / continuity. I went from one corner to another corner to test each branch of LEDs and finally made sure that all the +5V had continuity and all the GND had continuity. Then I went all the way to the ends of the LEDs where the connectors are located and made sure that each end still had continuity and re-mounted everything. Everything checks out, except for the Data line. I find it odd that not a single branch of the LEDs Data line had continuity. I can't imagine that in any world that this could be possible... Anyways, I fire everything up and without much surprise, the lights don't turn on ..... |
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Yes, there are 4 legs that I marked on the picture earlier. It's +5, ground, data-in line (you should have 0Ohms to Pico header for these 3 lines and no one should be shorted to each other) and data-out (not interesting) for the next LED in line. Maybe using needle connected to the probe will be enough just be carefull not to damage anything. |
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Ok, I did a bit of testing and was able to do it without removing the silicone; I managed to just poke the needle of the multimeter in from the edge. However, the issue is not knowing what each leg is actually connected to -- is there a standard for this? I googled and couldn't really find anything ... But on to what I did find out ... if I numbered the legs of the photo you referenced from 1 through 4 starting from the top left and going clockwise: 1 is shorted to V- Wondering if maybe replacing / splicing the front end of the string of LEDs would be a solution? |
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pinout https://cdn-shop.adafruit.com/product-files/1138/SK6812+LED+datasheet+.pdf if there is no short on the led strip leftovers between data and ground then something wrong is with the led strip after soldering.
so its shorted on the power down system and its excatly 0ohms (not 0L) |
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Sorry for the delay, but yes you have it correct. |
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Oh and yes you are right, on the off-cut pieces of the LED, there is no connnectivity between the data-in and the other legs. |
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Hi everyone, I'm new to setting up HyperHDR and slowly piecing things together.
My setup consists of HyperHDR running on a RPi4 connected via USB to a Pimoroni RP2040.
The pico is flashed with the appropriate firmware and is recognized by HyperHDR when selecting the "output path":
My next step is to get the pico wired up with the LEDs (SK6812 RGBW) but before I do it, I just wanted to make sure I'm wiring things correctly. The power for the LEDs will be coming from a power supply providing DC 5V 20A.
I plan to connect the LEDs +5V and GND to the power supply's V+ and V- respectively. The Data from the LED is going to go to the Pico's DA terminal. Am I also supposed to take the power supply's V+ and V- to the Pico's 5V and "-" terminals too?
The LED strip will be approx. 4m and will just be the one segment going around the TV. Based on the single segment schematic below, it looks like the +5V and GND of the LED strip is actually a closed loop. I just wanted to verify that this is indeed correct.
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