what resistor do i need to power an led off of usb cable
The USB cable that I used to know
One old Motorola cable used to work and now information technology doesn't, i new cablevision works great. One new cable says it's charging but it'due south flaky and doesn't turbo charge. CodingJoe Joseph Nielsen: Why exercise bad things happen to good phone chargers? Let's dive in and meet what we can notice. The USB cable that I used to know is the same. It's not easy to have a shut-up of the cables with your hands full ability.
We all stop up with the same question: why do bad things happen to good phone chargers. This is my problem: one old cable used to work and at present information technology doesn't, one new cable works great, one new cablevision says it's charging merely it's flaky and doesn't turbo charge. Let's dive in and come across what nosotros can notice.
On the surface, these iii cables look the same. (This is a cue for me to bust out my handy dandy Celestron microscope.)
But first, how do they work?
A quick Google Epitome search for "micro USB schematic" returns this image from this website.
I was embarassed afterward I learned this information. I used to think the outer shell had something to do with the electricity afterward watching some artificial YouTube videos where people endeavour to prepare their cables with needle nose pliers. It all has to do with the edge pins on the inside.
My practiced old Motorola cable
I've got a Moto X Pure/Style. The cable has recently lost its grip and I have to hold it in in order for my phone to stay charging — (my 3rd replacement).
Here'southward the close up of the erstwhile Motorola.
The Imkey cablevision (aka this thing looks clever with springs on the ends and it's covered by Amazon Prime number)
When the Motorola cable became loose I thought okay, I'll social club another cablevision online and to make certain it doesn't get faulty again — and because I'm then clever — I'll lodge this fancy cable with springs on the terminate. Except when I get the cable my phone constantly changes its mind most whether or not it's charging. It likewise doesn't practise "Turbo Charging" mode. So yes… I at present have a clever telephone cable that doesn't charge. (But hey, aircraft was free.)
Here'southward the close upwardly.
My married woman's new Samsung Galaxy vii USB cable
While I may be prone to think I got unlucky with the Imkey cable, unfortunately the Imkey cablevision state of affairs is true for every other cable in my business firm. I was thinking there must be something well-nigh either the turbo charger plug or the turbo charging cablevision. Then I tried out the USB cablevision my wife got with her Samsung Milky way 7. It worked peachy. Not flaky. Not loose.
Here'south the close up.
What'southward the difference?
At commencement glance, the reason why my old Motorola USB cable slips right out is immediately apparent. It has no fangs!
(I had thought maybe it was filled with dust. I saw a YouTube video that talked about that. But there was nil in at that place after I done the cable out with an insulin syringe and rubbing alcohol, followed by lots of Nintendo blows to dry it out.)
The fangs haven't cleaved off of the cable. They've just lost their spring. I needed to bend them back out.
I searched around for some different tools: blood sugar lancet, sowing needle, button pivot, needle nose pliers. In the end, the push button pin worked best at jimmying the fang back into place.
It should get without maxim: unplug any charger cables before y'all mess with stuff. This is not a "how-to set" article only a "allow'south mess with stuff and hopefully not kill myself or offset a fire simply if it happens that'll exist cool besides" article.
So I bent back the fangs on the USB charging cablevision and it worked great. Fits snug. No longer has that "is information technology really plugged in all the fashion" feeling.
Cheque out this picture to see the opposite stop of where the fangs go.
Afterwards reviewing this close-up of the female person micro USB, I thought maybe I've also bent the impressions on the inside so that the fangs have to exist bigger in order for the cable to piece of work. It reminded me of how I fixed my one-time record player from Inferior High — the needle wouldn't work until after I taped 3 pennies on to it.
The Imkey isn't exactly the same as the Samsung USB cable
Using sophisticated "count the pixels on the screen" measurements, I calculated that the Samsung cable's fangs were 26% the top of the main cable male body. The Imkey cable's fangs were only 24% the height of the principal cable male person body. Size matters.
So I jimmied the Imkey fangs out a little more than. Sure enough it snapped to a lot improve, however it still didn't recognize 'Turbo Charging" mode. That'south when I also noticed when looking down from the acme, that the Imkey's shaft was longer than that on the Samsung cablevision. Besides, the Imkey'south pins appear to exist slightly tighter. (17% on the Imkey; 21% on the Samsung and Motorola.)
And then it'south still beyond me why the damn Imkey new cable won't piece of work as skilful as my newly fixed Motorola cable or the new Samsung cable. My best guess is that the pins don't line up as good every bit the other two cables. I also don't know if the cable only doesn't back up the required ampere for Turbo Charging.
In conclusion, test what y'all call back y'all know and look closer. I hope these close up pictures aid whatsoever troubleshooting you're doing with your ain cables.
Here are links to the cables I worked with: Motorola, Samsung and the Imkey. I took pictures with this Microscope.
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