The other reviewer wasn't kidding that you need to find the correct 'alignment' for the USB-C cables for this to work; I was just about to give up hope and conclude that this device wasn't going to work with an iPhone and then all of a sudden found the right combination of cable alignments and it sprung into life.
I paid an absolutely outrageous price of $35.00 international shipping on a $9.00 order that still took two weeks to arrive from the US to UK, but I've not been able to find anything else that passes through USB PD so reluctantly paid the price.
Response from Essence Engineering | Nov. 27, 2023
Always appreciate feedback. Glad you got it working! As I noted in the description, not all USB cables are built the same so testing with different orientations of cables you have on hand is often necessary. A note about international shipping prices (from US): Definitely sucks that I can't do Amazon style cheap shipping for all the DIYers out there but I only list what usps charges with minimum adder to cover shipping material.
In my Nissan Maxima, the AV unit's USB port only supplies 500mA of charging current which is not enough to charge up my Galaxy S22. I also have a separate fast charger with USB-C PD output. I wanted a way to fast charge my phone while having a data connection to my car so that I can use Android Auto. I originally tried a USB hub but that didn't work. Then I found this device on tindie, got it within a couple of days and plugged it in. To my disappointment, it didn't work. However, I decided to give it another try with a different set of 1-foot long USB-C cables and to my pleasant surprise it worked! I did have to flip the cables around until I figured out the right orientation. USB-C is supposed to work in either orientation but that unfortunately isn't the case with this power splitter however since it's a one time setup it's not a big deal. While this is a very simple board that only consists of a couple of resistors and USB ports, it does the job that I need it to do and is valuable to me.
Response from Essence Engineering | May 8, 2023
So glad it worked for you! Due to the variation in USB-C cable internal connections (some don't have USB2.0 data connected, some only have power negotiation connected) one may have to play around and try a few configurations to make it work. Thanks for leaving a detailed review too! :D
This works just like the PJRC OctoWS2811 adapter, but better for these reasons: 1. Easily injectable high current power. 2. releasable screw terminals! 3. pin socket is plug and play with teensy + pins!!!