Comment on i have a problem with USB c charging đ
DNOS@lemmy.ml â¨9⊠â¨months⊠agoHey Iâm just scratching the surface of how deep this topic really is, I have read some articles and at this point Iâm really confused, if I plug the USB cable in and search for 5v pads what will I found the vbus line which at the moment is the cc ? Or the d+ with the bc1.2 ? And how do I know what standard is it using at the moment ? Anyway from the wireless charger I only get 3 cables out 5v gnd and ID (keep in mind I have bought wireless chargers with the lightening plug because I wasnât aware of such a complicated standard and they were cheaper anyway since now it doesnât work I will bui proper USB c Qi chargers ⌠) So as I understood I should add a 5.1 k resistor because the charging board is expecting a pull down but I didnt get where ⌠On the cc line ?
litchralee@sh.itjust.works â¨9⊠â¨months⊠ago
I will note that Iâm not an expert in the plethora of USB charging standards. Quite frankly, USB C is almost like black magic to me. With that said, finding the D+ and D- lines might be tough unless youâve got a USB C charging cable youâre willing to cannibalize.
That is, what you can do is carefully splice into such a cable, then connect it to the board and a USB charging block. By probing the wires, you can rule out the power wires, which should leave you with the D+ and D- wires. You would want to do this with a cable thatâs meant only for changing, such as USB C to USB A. That way, there would only be four wires inside. If you cut open a USB C to C cable, youâll have a lot more wires that you have to check.
Once you identify the D+ and D- this way, you can then do continuity checks from those wires to various pads on the board. In this way, youâll eventually find your D+ and D- pads, and can then add your temporary resistors, to see if that works.
As for identifying the USB charging spec in use, thatâs going to be tougher. I think there are test devices that take the place of a USB charger and can display or change the spec, but Iâve never used such a thing.
DNOS@lemmy.ml â¨9⊠â¨months⊠ago
Thanks so much for your help I will make some tests and hope for the best I now at least know thatâs a lot more complicated that what it seems yeah definitely black magic to me too đ kinda ironic the universal name if u then have thousands of different standards