**** BEGIN LOGGING AT Mon Nov 30 03:00:00 2020 Nov 30 16:39:47 I summon the zmatt!!! Nov 30 16:40:21 can you dig up that tool that can help me track down this cape issue? Nov 30 16:41:18 I tried the lcd cape on the BBB and it works so it is not a hardware thing. also the pins look good too... it must be something quirky with the BBai Nov 30 16:41:28 nothing jumps out at me on the kernal log. Nov 30 18:32:11 MattB0ne: https://liktaanjeneus.nl/drm-dump.tar.gz Nov 30 18:33:20 after unpacking invoke as ./drm-dump /dev/dri/card0 or one of the other /dev/dri/card* devices as argument... it'll be easy to recognize the correct one, it's the only one with more than a few lines of output Nov 30 18:36:14 the most interesting part would be whether it sees a "connector" object other than the HDMI one Nov 30 18:44:12 thank you sir!!! Nov 30 18:44:27 thank you!!!! will give this a shot. Dec 01 00:56:06 Is there such a thing as as 12v LED (RGB) that only has two wires, i.e. an anode and a cathode? Dec 01 00:56:58 I mean...I know there is now but if I plug it into the BBB and LoadCape, are there any safety measures to take? Dec 01 00:58:38 if you're asking about a specific product, link to the product page or datasheet, or at the very least give the exact part number Dec 01 00:59:12 Oh. Okay. It will take time. I need to track down where I purchased them and when I got them. Dec 01 00:59:14 Sorry. Dec 01 00:59:23 "12V LED (RGB)" sounds weird but has some possible interpretations Dec 01 00:59:40 Right. That is what I thought. Dec 01 00:59:54 The packaging states, 9v to 12v. But... Dec 01 01:00:06 I plugged it directly into a 3.0v coin cell. Dec 01 01:00:14 .... Dec 01 01:00:30 Yes? Dec 01 01:00:52 "packages states 9V to 12V" .. and thus you connected it to something way outside that range Dec 01 01:00:59 Right and it worked! Dec 01 01:01:46 This makes me think that putting 12v into it may be overkill. Dec 01 01:04:15 more likely it drew an excessive amount of current from the battery (which lithium batteries can usually sustain, provided they don't overheat and explode in the process) Dec 01 01:04:26 https://www.amazon.com/gp/product/B07W4JWDNC/ref=ppx_yo_dt_b_asin_title_o08_s01?ie=UTF8&psc=1 is the page online. Dec 01 01:04:28 Oops. Dec 01 01:04:49 Let me see if I can find the datasheet. Dec 01 01:05:02 anyway, the wide input voltage range means it has some form of internal regulator Dec 01 01:05:48 lol Dec 01 01:07:43 It has one resistor per LED. Dec 01 01:07:49 Supposedly. Dec 01 01:08:04 okay so it's not a led, it's a set of leds with some electronic control circuit Dec 01 01:08:19 Well. Dec 01 01:08:34 given the "colors change automatically" Dec 01 01:08:37 it is a LED but has a resistor on the anode. Dec 01 01:08:55 Oh. Dec 01 01:08:57 I got you. Dec 01 01:09:06 yeah, so I was too optimistic about having a regulator of any sirt Dec 01 01:09:16 So, there is an in...dang it. Dec 01 01:09:22 right. Dec 01 01:09:42 no circuitry really, just a resistor on the outside. Dec 01 01:09:57 which makes sense given this is some obscure no-brand chinese garbage (both the company name and the part number yield basically just amazon and similar stores as top google results) Dec 01 01:10:16 Oh. Dec 01 01:10:24 Dang it. So, I got ripped off? Dec 01 01:10:44 Well, at least I can say that the datasheet is missing. Dec 01 01:10:50 So, yea. Dec 01 01:11:05 unless the title is just wrong Dec 01 01:11:17 Title of the LED itself? Dec 01 01:11:57 ah I see they have both fixed colors and "rgb fast/slow flashing" Dec 01 01:12:48 So, the seller of these states that it works at 10mA at 9v. Dec 01 01:14:53 okay, so what was your question again? Dec 01 01:15:13 whatever these things are, they're evidently designed to run at 9-12V DC Dec 01 01:15:50 Okay. No issue. I was not sure if it was real or not b/c I had not come across such a LED. Dec 01 01:16:05 Will it work w/ the LoadCape at 12v? Dec 01 01:16:12 yeah it's definitely not a single LED, it'll be some sort of LED assembly Dec 01 01:16:19 I'd assume Dec 01 01:16:39 I have a single LED here that is RGB and has two wires. Dec 01 01:16:55 by assembly, are you referring to the resistor on the anode? Dec 01 01:16:59 you have a single LED-shaped device with two wires Dec 01 01:17:08 Right. Dec 01 01:17:20 well I mean, "LED-shaped" is also a bad description, a led doesn't really have any specific shape Dec 01 01:17:37 Right. Dec 01 01:17:49 It does have a "LED" shape to it. Dec 01 01:18:04 I cannot tell the contents of its interior. Dec 01 01:18:13 it is a small "LED". Dec 01 01:18:51 I guess there is one real way to figure it out. Testing will ensue. Dec 01 01:20:57 yeah in some RGB leds if you manage to take a good close-up picture you can see the individual leds: https://imgur.com/gallery/DaN47 (the three tiny squares are the leds, the thing on the right is the control circuit) Dec 01 01:22:13 I saw it. My phone will not do it justice. I can try, though. Dec 01 01:25:05 I'd hope this thing has multiple leds in series to justify the 9V forward voltage, though that makes it a bit puzzling why it would work on 3V. the alternative explanation, that it has an integrated switch-mode led driver is incompatible with the series resistor Dec 01 01:26:05 so most likely this thing turns most of the energy into heat and only a small portion into light :P Dec 01 01:29:25 Oh. The ideas online for it were that the higher voltage, the higher the brightness. Dec 01 01:29:43 that's how led + resistor works yes Dec 01 01:29:48 Aw. Dec 01 01:29:50 Okay. Dec 01 01:30:28 specifically led brightness depends on led current, and the series resistor allows you to control the led current using the voltage Dec 01 01:30:33 it's inefficient, but cheap and simple Dec 01 01:32:23 (the higher the voltage, the less efficient it will be - the heat product will increase quadratically while the light emitted only increases linearly) Dec 01 01:33:01 So, hot and bright. Yikes. Dec 01 01:35:36 if the 10 mA @ 9V is true then that's 90 mW of energy. the page also says 20 mA @ 12 V, which is 240 mW for at most twice the light output Dec 01 01:37:16 anyway, I don't want to spend any more of my time on this junk... the usage seems straightforward enough Dec 01 01:37:29 Okay. Dec 01 01:37:31 No issue. Dec 01 01:38:06 the worst that can happen with lower voltage than prescribed (9V) is that some of the leds might fail to fully turn on, or perhaps the control circuit might behave wonky Dec 01 01:38:28 Okay. Dec 01 01:38:42 That is what I figured after I turned it on not thinking. Dec 01 01:38:46 if it works to your satisfaction with a lower voltage, feel free to use that Dec 01 01:38:59 Okay. I am going to try the LOADCape. Dec 01 01:39:06 12v! Dec 01 01:51:40 It works dandy w/ the LoadCape. Dec 01 01:51:46 dang it. **** ENDING LOGGING AT Tue Dec 01 03:00:01 2020