Want to charge your glowscars using your phone, but your phone’s flashlight does not cut it, and you don’t want to carry a flashlight around?
I modded my phone case to include a reversed QI to USB charge receiver and high-power 365 nm LED. This way the LED can be powered by the phone’s QI power share feature.
The mod is entirely non-intrusive - NFC still works, and if you want to remove it, just swap the case.
QI charger: One that outputs to USB, e.g. Amazon.de
Resistor: Standard 10 Ohm THT
I unwrapped the QI charger, removed the included USB cable, and soldered the positive LED pin directly to the center (positive) pad of the QI receiver. Then I used a wired 10 Ohm resistor to bridge the negative pin of the LED to the ground pad of the QI receiver. This way the current to the LED should be limited to around 150 mA at a voltage drop from 5V to 3.6V.
I then used some tape to stick everything in place, made a hole in the case for the LED to shine through and sit in, and reassembled the case. Make sure to place the QI ferrite pad below the QI coil. Now, each time I enable the wireless powershare feature in my phone, the UV LED lights up.
I also used some sandpaper to grind down the LED lens dome to the level of the case, such that the phone is able to lie flat on the table gain. Then I applied a sticker with a little cutout to bridge the gap between the LED and the case.
Pros:
Charges the glowscars easily, way better than my flashlight
Separate control from the phone flashlight
Non-obtrusive placement in the case
Easy to remove later on
NFC still works
Cons:
QI charging the phone no longer works with the case on
Power sharing to another phone no longer works with the case on
Case is a bit more bulky
LED gets quite warm with continuous usage, so only short-ish bursts are recommended
I’m considering the possibility that using UV isn’t the best idea. First, it’s not good for the skin.. that’s a given. Second, it’s also probably not a good idea to repeatedly expose the resin to UV. It will slowly break down from this.
If you want to accept these risks, at least use a 420nm LED to slightly reduce the risks. The best approach though would be to use a sub-uv blue LED.
After we run out of UV flashlights we are not going to restock. Instead we are going to go through testing different LEDs and obtain new flashlights with an appropriate LED.
Charles Baldwin, the creator of the biohazard symbol, would not approve of that use…
‘‘Every time I go into the doctor’s office or the dentist’s office or a hospital anywhere, I’ve always got my eye out for it. Naturally, I’m proud of the fact that I was able to come up with something, or direct a program that evolved into this symbol that’s so widely recognized, so helpful. But I ran into a peculiar situation one time a couple years ago when someone was putting on a seminar on biohazards. As gifts for the participants, he devised a beautiful tie with little biohazard symbols all over it. This got me upset, and I sent him kind of a nasty letter saying this symbol was not designed to be used sartorially.’’
That is a nice thought-terminating cliche, but I think that a person who made a thing gets special consideration when they say something about its purpose. You can disregard that advice, but you shouldn’t do so without bothering to consider it.
I like you, and I understand your personality.. but this is unnecessary. It’s an insult where one is not warranted, and even worse, it shows you might actually believe that I or anyone else here on this forum are just not “thinkers”, or don’t think or consider what we post here before we post it.
I actually deeply understand the subject.
I also understand that attempting to control how a thing is used once published into the world is folly, and a simple waste of energy. I don’t have energy or time to elaborate on this, suffice to say I think about a lot of things, quite a lot, this subject included.
My goal with this forum is to keep it an oasis of sorts.. kind of like a “we’re not like other internet forums” sort of thing. I understand your personality is rather prickly when it comes to your opinions.. and that’s ok. Just consider where you are posting and what kind of people are regulars here before you make such sharply pointed remarks. We take your words seriously.
I apologize for insulting you. I have no excuse and will try to remember where I am when I post here so that I don’t bring any toxic nonsense in from the greater internet.
I think that was one of those “using devices outside their intended purpose” cases. The magnatron was initially designed in Britain as a microwave generator for WW2 radar systems. It was discovered it could heat shit up by Percy Spencer at Raytheon in 1945 when a candy bar he had melted. The “Radarange” was the first microwave oven in 1947 designed to heat food and shit.. not mice
There was an RF hamster heater before the microwave, but I don’t think it used a magnetron. Tube based RF heaters for medical use were also a thing back in the day, but I’m not sure if those came before or after the microwave…
Also, hat’s off to whoever designed Electroboom’s wireless microphone:
I ran out of laser / high energy light stickers. Also, using things in ways they were not supposed to be used is kind of the whole idea.
