I've just disassembled this LED floodlight that I bought a while ago. It's some stupid little cheapie from a dollar store, so I figured that there'd be shit inside. But I wanted that LED cob.. a power LED :3

Well, shit wasn't too far off from the truth. The component choice is reasonable, but the design of the bloody thing.. batshit insane. The LED floodlight is powered by 4 AAA batteries, connected in series. So 6VDC. That then goes into this little tactile pushbutton, into the LED cob and then a 4.7 ohm resistor.

Well that's a pretty easy circuit.. let's remove the batteries and the casement, and put it on the lab bench power supply. Probes connected to the circuit with only the resistor and the LED cob in between (I didn't want to deal with the switch). Power supply set to 6V, current limiting to 500mA, contact!! And it works, amazing! So I let it run for a while to see that nothing gets too hot.. hah. After a minute or so, smoke would come out.. LED cob was a bit warm to the touch but nothing too bad. But the resistor.. I could cook water on it if I wanted to! 100 fucking °C, and rising. What the F yo?!

So I figured that I didn't want to put the resistor in between there. Just the LED cob now, which apparently has a forward voltage somewhere between 3.2V and 3.3V depending on how I set the current (500mA and 600mA respectively). Needed a bigger heatsink though, so I jammed one of my aluminium heatsinks on there. And it worked great! Very bright too, as it takes between 1.6 and 2W of power. Just for a comparison, the lighting in my living room is 4x5W and the ones on top of my dining table are 2x3W (along with some TL bar that my landlord put there.. fluorescent I think). So yeah, 2W is quite a lot for an LED, especially when it's all concentrated into one tiny spot.

That said, back to the original design with the resistor. 2 questions I have for that moron that designed this crap. First, why use a resistor for a power LED?! They needlessly waste power, and aren't good choices for anything that consumes more than 100mA. You should use PWM for these purposes, or tune your voltage on the supply side. Second, why go with 6V when your forward voltage is 3.3 at most? Wouldn't it make more sense to use 3 batteries with 4.5V? Ah, but I know the answer to the second one. AAA cells aren't rated for high loads like this. So that's likely why the alkaline cells that I had in there before have started leaking. Thanks, certified piece of shit!

Honestly, consumer electronics are such a joke... At least there's some components that I can salvage from this crap. Mainly the LED cob, but also the resistor and the tactile pushbutton perhaps.

One last remark that I'd like to make. This floodlight was cheap garbage. But considering that you can't do it well at that price, you just shouldn't do it. You know why? Because consumers always go for the cheapest. Makes a lot of money to build at rock bottom prices and make shit, but it damages the whole industry, since now the good designs will go out of business. That's why consumer electronics is so full of crap nowadays. Some unethical profiteering gluttons saw money, and they replaced the whole assortment with nothing but garbage. I'm sure that there's a special place in hell for that kind of people.

Pro-tip #526:
Do NOT short your power supply.

RANT TIME!

Sorry guys, I know this is devRant and probably not a place to post this but am fucking burning with fury and fatigue! I should probably develop elecRant and post it there instead.

I FUCKING HATE POWER ELECTRONICS!!

I am in my final year of electrical engineering and I can fucking say with confidence that power electronics is the most fucked up unit I have seen in my life. A whole load of useless math from simple RLC circuits just to make students' lives miserable. For those who might not know, power electronics is some unit that involves use of solid state electronics(transistors, diodes etc) for power applications(switching mostly). Basically things like inverters and converters. UPS systems are an example of their applications.
Now don't be fooled by how that sounds cool and so smart, this shit is fucked up. These circuits in the attached picture might just seem like simple RLC networks with some BJTs, but they are devils in their own right. They fucking need some advanced unnecessary calculus and Fourier analysis to even calculate the simplest output current!! Worst still, some of these motherfuckers have more than 1 mode of operation,needing one to analyze some fucking 100+ waveforms. I fucking hate this shiit! I hate it!
You might say that i am just being lazy and don't want to study. Let me tell you something, FUCK YOU TOO!!

Help.

I'm a hardware guy. If I do software, it's bare-metal (almost always). I need to fully understand my build system and tweak it exactly to my needs. I'm the sorta guy that needs memory alignment and bitwise operations on a daily basis. I'm always cautious about processor cycles, memory allocation, and power consumption. I think twice if I really need to use a float there and I consider exactly what cost the abstraction layers I build come at.

I had done some web design and development, but that was back in the day when you knew all the workarounds for IE 5-7 by heart and when people were disappointed there wasn't going to be a XHTML 2.0. I didn't build anything large until recently.

Since that time, a lot has happened. Web development has evolved in a way I didn't really fancy, to say the least. Client-side rendering for everything the server could easily do? Of course. Wasting precious energy on mobile devices because it works well enough? Naturally. Solving the simplest problems with a gigantic mess of dependencies you don't even bother to inspect? Well, how else are you going to handle all your sensitive data?

I was going to compare this to the Arduino culture of using modules you don't understand in code you don't understand. But then again, you don't see consumer products or customer-specific electronics powered by an Arduino (at least not that I'm aware of).

I'm just not fit for that shooting-drills-at-walls methodology for getting holes. I'm not against neither easy nor pretty-to-look-at solutions, but it just comes across as wasteful for me nowadays.

So, after my hiatus from web development, I've now been in a sort of internet platform project for a few months. I'm now directly confronted with all that you guys love and hate, frontend frameworks and Node for the backend and whatever. I deliberately didn't voice my opinion when the stack was chosen, because I didn't want to interfere with the modern ways and instead get some experience out of it (and I am).

And now, I'm slowly starting to feel like it was OKAY to work like this.

Just disassembled 2 €5 desk fans because they were shit.. and so is their design apparently.

What I found inside was actually surprisingly simple.. a toddler could build it. It's just a DC motor, a 3PDT switch, DC barrel connector, some wires and screws to hold stuff in place. Oh and the plastic thingie with the fan blades, as well as the USB cable of course.

5 fucking euros. The combined cost of the components would be less than 3, certified motherfuckturers. Time to build it, injection moulding, transportation, sure.. but still.

And if you think that being salty about €5 is cheap shittalk, expand that to every fucking piece of electronics that doesn't cost a small fortune.. at all price ranges. Could be radios, alarm clocks, heck even phones. Shit's way too expensive for what it's worth. Perhaps because so many people in the industry are just here for a quick buck.. motherfuckers 😒

Anyway, back to the design.. the hole in the fan blade thingie is supposed to get the motor's shaft shafted in, to turn the blades. I'd use glue there.. but not these designers. They just shove it in and hope that friction takes care of everything. And one of the fan blade modules' hole was so wide that inserting the motor is like throwing a sausage down the hallway. No contact at all! Make it tight already like the Chinese designer's glory-...
Nah let's not get into Chinese tightness just yet.

Oh and also a resistor for slow mode. Consumes just as much power except the fan turns slower. Because fuck efficiency, right?

Goddammit, next time I'm just gonna build my own again.. at least that wouldn't be a certified piece of shit 😑

Soooo I think I have finally come to the point that I may have to create a YouTube channel, to teach software engineering from the ground up... and teach it the way the universities and everyone else should be teaching it, so that they have a solid foundation.... throwing hello world, and loops and variables at folks out of the box without any of the environment context or low level embedded register, even logic gate understanding

That lack of understanding is why, soooo many college students and younger folks, are actually pretty shitty engineers. Everything is high level languages and theoretical concepts to them. Nothing practical, that’s why there’s sooo many python and java developers that can’t for the life of them understand memory management, low level hardware interfacing etc, because the colleges don’t teach it the way it use to be taught.

I seriously fear 30 years from now or sooner when there are few embedded engineers only left till retirement, as without those folks the whole pyramid of electronics falls to pieces.

Java, C#, python, all that shit don’t run on the bare metal... there’s this magical layer of C, and assembler that does all the work just so folks can abstract their thoughts.

Either 1 of two situations will happen.. price of electronics will rise because the embedded guys are few and far between therefore salaries skyrocket... OR everything starts running shit like java on the metal, where there are a over abundance of developers, their salaries will be low because there are soo many but the processing power, space, and energy needed to run java natively causes electronics cost to increase

but regardless 30 years from now if those script kiddies are building everything I fear it cuz there’s gonna be memory leaks, and overflow issues everywhere.. shit be blowing up more than 4th of July.. lol

Soooo in effort to prevent that and keep the embedded engineers up, or atleast properly educate the script kiddies, I’m gonna make that YouTube channel.. 1 maybe 2 videos a week, 1-2 hours sessions each.. starting at the fucken ground and building up.

*receives an old business laptop as payment for refurbishing another one*

Hmm, this thing doesn't have a charger with it.. looks like it's taking 18.5V.. my HP laptop's charger supplies that but its barrel connector doesn't fit 🤔

Regular users: oh dear now I have to buy a charger with a fitting connector for this.. where do I even start?!
Me: Well I guess I could just remove the charging port and solder some wires straight into the board instead 🤔

But that voltage.. my HP laptop's charger is still in use and I don't really want to fuck around with that one.

Regular users: oh dear oh dear, shouldn't I just throw this laptop away?
Me: well I guess that I could just use one of the rails of my upgraded lab bench power supply for it?

Lab electronics saving the day, every day, time and time again.. fuck yeah 😎

I've noticed something odd lately.. every time I mention mains electricity in certain EE forums, people tend to go "you are a madman for wanting to use that 🤨".

To which I think in my head, sure it's a dangerous thing, after all the angry pixies that dance back and forth are kind of angry (120V) or actually insane (230V) depending on where you live.. but to mindlessly tell people to not use it at all, as an electronics engineer.. what's up with that?

I mean, it's a matter of respecting its power, right. So whenever I work with it, thick gloves, keeping my exposed lines as tiny as possible, keeping them around for as short as possible, properly insulating anything permanent, and even asking my landlord to install a defibrillator for when things still go horribly wrong (to which she agreed because it'd be useful to the other residents as well, yay 😁) are kinda mandatory.

And that's for the same reason essentially that precautions are taken when climbing a mountain by having climbing shoes, connecting yourself to pikes jammed into the mountain over a strong metal wire in case things go wrong, etc etc. And for the same reason that you don't climb a ladder in high heels and so on. Obvious, right.

Point is, inexperienced people indeed shouldn't be working with mains AC at all and that's the reason that I've avoided it in the first year or 2 of learning about electronics. But mindlessly telling people in EE forums that they're a redneck for working with the imminently lethal AC.. what's up with that?

Maybe I should just go find another electronics forum like the EEVblog forums over some random (kinda dead) electronics chat on Telegram though ¯\_(ツ)_/¯

What you are expected to learn in 3 years:

power electronics,
analogue signal,
digital signal processing,
VDHL development,
VLSI debelopment,
antenna design,
optical communication,
networking,
digital storage,
electromagnetic,
ARM ISA,
x86 ISA,
signal and control system,
robotics,
computer vision,
NLP, data algorithm,
Java, C++, Python,
javascript frameworks,
ASP.NET web development,
cloud computing,
computer security ,
Information coding,
ethical hacking,
statistics,
machine learning,
data mining,
data analysis,
cloud computing,
Matlab,
Android app development,
IOS app development,
Computer architecture,
Computer network,
discrete structure,
3D game development,
operating system,
introduction to DevOps,
how-to -fix- computer,
system administration,
Project of being entrepreneur,

and 24 random unrelated subjects of your choices

This is a major called "computer engineering"

One job I picked up was for an IoT Start Up. It was quite interesting work, reporting to the technical director, who was an electronics engineer, who was designing the hardware himself, they had a couple of firmware guys already, and just needed someone to take care of the software.
So they said they needed something in Azure that they could stream their data to and provide analytics for their clients. It had to be Azure, and it had to be Azure Native, and was to be Multi-client, as they had a deal with Microsoft to showcase how well Azure works in the IoT space at an exhibition/conference in 3 months time.
So I worked flat out for 3 months, on a whole variety of technology, from C++ to get the radio packets from their IoT chip, Python to run on the hub to take the data from the C++ and stream it to the cloud, Azure IoT Hubs in every continent to receive the data and store it an a Cosmos DB, and then Power BI analytics wrapped up in an Angular front end that the clients could log into.
Got it finished 2 days before the show, and they were so pleased I got flown business class to Singapore to be on the stand and talk to customers.
The first sign of trouble was when we arrived at the show to find we just had one of those little circular tables with two stools in the middle of the floor, about two feet across and no power.
No problem, I was able to sort that, swapping laptops in and out.
Microsoft were really happy with what we had, and couldn't believe I had thrown it all together in 3 months.
We picked up a potential customer for the system, a major Asian Telecoms company.
Then when we got home, the CEO swooped in. I had never met this guy before. Imagine one of the VC guys from Silicon Valley, or the CEO from the IT Crowd. You get the picture. Could talk the hind leg of a donkey, and real street smart, but no brains. He insisted on "taking it from here" and flew alone to strike the deal with the customer. Came back with an MOU in his pocket and said to me, their guys will be in touch with you.
Then I got a call. Can you send us the source code and tell us how what servers we have to run this on?
Um, its cloud native.
No, we can't use a cloud it has to be on our servers - your CEO told us that was no problem..
He hadn't even taken the trouble to find out what it was we had built, and what he was selling.

Any idea how to make a fan in an HP laptop spin at lower temperatures? The fan in my Pavilion dm-1 only starts spinning when CPU reaches 75°C and enters full speed when the GPU also becomes 75°C. Which is strange because this CPU and GPU are one and the same thing.. an APU. And overheating freezes often happen at around 75-80°C.. which isn't too much of a headroom really. I'd rather have it kick in at 50-60°C already, but would like to avoid using the power of the soldering iron for it.. I've already lost a fan to that previously (current one is a spare part from AliExpress). Granted, my soldering experience was much less back then.. nowadays I can probably even solder 1206 SMD packages comfortably. But I don't want to risk it, and I've got experience with custom kernels anyway.. are there any fan speed governors in the kernel that you know of?

FWIW, fancontrol doesn't seem to be supported on this laptop, and neither is pwmconfig. Perhaps I'll have to stick to the electronics method after all? Given that it's just a 5V fan, I guess that I could feed it power by tapping some power from a USB rail and controlling its speed from an ATtiny85.. but inside the laptop there isn't enough space for that and I don't feel like freeing this hardware out of its laptop chassis yet (though that is on the list). Either way running at 60°C under no load is terrible.. some HP certified enganeering "feature" I guess...

The hand of IT guy in family

My family sees me as guy who works on IT stuff. The best part is that I will have to help them whenever they encounter problem regarding electronics in daily activities.

Son! The internet is not working
Son! The printer is not working
Son! The TV is not working
Son! My phone didnt get any signals
Son! The microwave is not working
Son! The TV remote is not working
Son! Why is this whatsapp popup always appear whenever I opened it
Son! The dvd player is not working
Son! My phone wont charged
Son! I want to buy online stuff
Son! The email that ur uncle sent me cannot be opened
Son! The email that ur aunt sent me is not there
Son! Can u help me download this travelling app
Son! I opened a website and it told me that I have 163718362 virus!
Son! I forget my password of my facebook account!
Son! Some guy idk on facebook added me as his/her friends, what should i do?
....
Son! The internet is not working (again)

The fact is that, most if these problem, I helped them by just.. restarting the router, reboot the router for 1 min interval, find specific toggler in disfunctional hardware that they accidentally hit during sweeping the floor, take out the power and put it back again, show them how to's in many account/payment mechanism in apps, etc

The very best part that whenever they satisfied, whenever things back to work again, whenever they can reset the password:

"I've tried what you told me, but it just didnt work, but idk when u did it, it works! you are really an IT guy"

And i was like
🙃

The default USB voltage hould have been specified to 6 instead of 5 volts.

Six (6) volts would allow for longer cables than five (5) volts do, since the spare voltage compensates for the resistance of cables. This is even more crucial for USB hubs. USB hubs are highly dependable upon these days due to laptop vendors dropping the number of USB ports down to two or even one. I am looking at you, Medion.

If several devices are connected to a USB hub, the voltage can quickly drop below 4.5 volts due to the resistance between the USB hub ports and the computer's USB port, causing some devices to restart themselves even if the computer's USB port is not over capacity. If it were over capacity, it would just regulate down its output voltage to prevent overcurrent.

Lithium-ion batteries need at least 4.3 volts arriving at the battery terminals to fully charge, and mobile devices are typically not equipped with a boost converter. Even if they were, they are rather inefficient, meaning they would produce significant heat and waste a power bank's energy. Other USB devices such as flash drives and peripherals might power off below 4.5 volts. However, 6 volts have solid 1.7 volts of margin to 4.3 volts, more than twice the margin of 0.7 volts that 5 volts have. On the way from the power supply to the end device, the voltage has to pass several barriers which weaken it, including the cable, connector endings, and the end device's internals such as the charging controller.

Sure, there are quick charging standards such as by Qualcomm and MediaTek which support elevating voltages to nine (9), twelve (12), and even twenty (20) volts. However, they require support by both the charger and mobile device. If six (6) volts were the default USB voltage, all devices would have been designed to accept this voltage, and longer cables could have been used anywhere. Obviously, all USB devices should be able to run on five volts as well.

Six volts would have been more stable, flexible, and reliable.

This basically is me rambling all my thoughts that have been clouding my mind.

Learning other programming languages after learning the first is harder than I expected. I learned python first but that's making learning others (which I know arent similar but ) C, ES6, PHP, etc. I need to figure out what makes each one special and get a proper path instead of learning them all the same way. Which is easier for the web dev languages but fuck man I just need a good path for them and I'm good. Like learn this this this this that and that and I've got a basic understanding of the language I dont need to stress and I can casually build my knowledge from here now that I understand all this. Cause I love programming and I want to be the best I can be and just get to the level I am with python. And at some point I have to learn about basic electronics and learning how to program Arduinos with C so I can do stuff with that because I really really REALLY want to.

It doesnt stop there. I want to learn another language and no I'm not talkin bout programming anymore I mean I wanna learn Japanese and German (but japanese primarily) but it doesnt help that I'm always either in school, studying, programming, or playing games. I just cant find time to practice Hiragana&Katakana (two basic writing systems in japan) and it doesnt help that I'm a lazy procrastinating piece of shit that doesnt have or can keep a proper schedule and hell I barely can English and Its my native tongue. Ugh. Itd be better if I had a native speaker to help me tbh.

And finally I want to learn basic pixel animating I have dreamed as a kid to do some kind of animation and programming and I want to do both for games I want to program for fun but it doesnt help that I cant draw sprites or anything for shit. I cant get it and I just am fucked but I'm going to ask some people I know and a few subreddits for advice/help/resources with that

Welp that was the Bubbles Power Hour none of you probably are keen followers of mine and if I had any I'd be shocked and honored but thanks for reading anyways and any advice on anything is always appreciated!

I just wanted to develop a cool webapp-controlled lighting for my bar.

Next things I know, there is electronics scattered everywhere, 2 multimeters to find what the fck is wrong with a PSU not outputting 1/100 of the current it's supposed to, said PSU opened on my desk, and I'm trying to find a capacitor online because there isn't any fcking electronics store selling spare parts anymore in my city.

Context:
- PSU means Power Supply Unit, in this case a computer one.
- PSU was given by a friend and is out of warranty
- the total consumption for all LEDs is 24A @ 5V consumption. A refurbished PSU is ideal for that
- that PSU is rated 2A @ 5V on the stand-by, which is perfect to power a Raspberry Pi. The issue is that there is a sharp voltage drop as soon as you try to use more than 20mA.

Alot of hacks around here!
An extract of some of those:
-Couldn't time the shutter right when photographing lightning. Used my oscilloscope to measure its electrical influence and anytime a peak is detected, it actuates the shutter.
-Using a lock as a heatsink for a overheating display driver ic.
-Hacking two USB ports together to get more power.
-Display module was too tall with header pins. Moved its back components to the main board and soldered the module flat onto it by flowing solder down its connecting holes.
-Not me but still interesting: Back on ye olde times when paid tv contained a disruptive H or VSYNC signal only their paid tv box could filter, my electronics prof. analyzed it and built the required comb filter on his own. Even sold some on the black market.

Electronic companies nowadays are no different than ranchers that force their slaves to earn money to buy new stuff cause people can’t repair old electronics or fix software bugs cause it’s not theirs or it’s not maintained and source code is not existent.

Damn you software and hardware corporations.

You tell everyone that you care about environment, yet you don’t fucking support your software and hardware as long as people use it. When you stop support you don’t make everything open source but keep it on your private repositories as intellectual property and fuck your clients.

Literally all electronics and software should be mandatory made open source to the people who purchased product so they can use it as long as they want not as long as corporate assholes want. This is insane law that is splitting our world and making it burn. If I could fix my laptop in nearby shop I wouldn’t have to purchase new one.

If it won’t change we will end up with <10 corporations that would rule world economy, everyone who will work for those corporations will be rich and happy and everyone else will be poor and unhappy . Mind me if this is not already happening and this planet slowly becomes Elysium movie nightmare.

Stop buying new stuff you stupid people cause this make things worse.

If it won’t change in 10 or so years there will be connected to cloud robots all over the world guarding us and some dick shit rich John Conor kid will hack them to exterminate humans by executing order 66. After that there will be big power outage that will put us into the role of battery and we would be closed in the barrel full of pink shit connected to matrix.

Get me out of here you asshole.

New to the the electronics stuff and I'm building a word clock. Recommendations for a microcontroller that has at least 22 outputs (22 words to light up). Something from Arduino? Also need to plug in for power and use an RTC.