The new technology may appeal to kids used to interacting with voice-activated digital assistants such as Amazon's Alexa, Apple's Siri or Microsoft's Cortana.
You can hear someone at Google say "Ouch!"
Now can i provide a PWM signal to a 4 pin 12Vdc computer fan with an arduino? because it is looking like a 555 timer won't make the high frequencies(24khz i think) that the PWM fans need.
Yes you can. Not exactly 24kHz. But 32kHz. Which works very well with the Owltech fan (4 pin) I have. http://www.formfactors.org/developer%5Cspecs%5C4_Wire_PWM_Spec.pdf says: 21-28kHz. When I use lower frequencies I can hear a buzzing. It worked at 500Hz just fine, with the exception of the slight but annoying noise. Running the fan at 32kHz PWM works fine. No noise, and the fan spins fast and slow as required.
I second this. Instead of working to earn money to pay someone, you can do it yourself in the first place.
Back in my home country it is (in the country side) common to let someone (AKA people who know what they are doing) build the outer part of a house (basement, cellar, walls, roof) and some other important or safety-critical parts like heating system, staircases, electric wiring (not allowed to do without proper qualification) and water pipes (you don't want them to leak in 5 years), and maybe finish enough rooms to live inside the house (kitchen, bathroom, one bedroom, living room), and then do the rest yourself.
There are enough books to read about the needed tools and skills.
The best part about this is when later something breaks, you have the tools and knowledge to fix many problems yourself.
And carpenters and related jobs are unpopular enough (no one wants to learn this type of work any more) that there is enough shortage of those people so that their hourly rates are surprisingly high and they get away with it. So it's a nice "Plan B" in case your current computer related job no longer earns you enough.
The absence of labels [in ECL] is probably a good thing. -- T. Cheatham