Here’s a Type-C extension cable that forwards VBUS and USB 2.0 data lines – but not CC pins. Let’s say, you want to extend the power port on a Raspberry Pi 4. Or are they? Are they a problem in practice, even if they’re not compliant? Let’s look at a bad example of one. USB-C extension cables are not USB-C-specification compliant. Today, we’ll go through USB-C contraptions which might or might not fail you, depending on how you use them. There’s many such failure stories, in fact. Here’s the notorious story of a USB-C cable that killed a Chromebook, and launched a career of explaining USB-C specifics online for.
(Cable labelling, anyone?) Clear definitions of what complies to a standard can help enforce it. On the other hand, USB-C is designed to be used by less-than-skilled people, even if it often fails at that. I would like you to provide with such understanding, so that you can make informed decisions. Hackers don’t need restrictions driven by marketing – they need understanding of how a piece of tech can or cannot be used, based on how it operates internally. It’s my firm belief that, as a hacker, you should be able to buy any USB-C contraption that you could ever need. However, the USB-C specification only accounts for a limited amount of kinds of cables, explicitly or implicitly excluding a range of cables that you might want to buy or make. There’s a lot of cables that we might want to acquire for our day-to-day use, perhaps, for a transition period while we still own some amount of devices not adorned with a USB-C connector. So yeah, here it is, a cool way to negotiate power from a USB PD charger and supply it to your laptop or whatever other project.Let’s be clear – it’s not enough to have USB-C to USB-C cables. The heat didn't seem to transfer much in to the box on this unit though - it remained cool to the touch the entire time. The cheap USB C to USB C cable I was using between the MBP charger and this unit was a little thin for the job - rated at 3a, so it got warm at the ends. I regulated the charge current with the solar charge controller and this thing ran for hours happily putting 68w in to the battery.
#USB C TO BARREL PRO#
I used an 87w Macbook Pro charger to supply this with power and test charging the packs. Multimeter testing and charge controller testing show 20.2v coming out the end of the 2.1x5.5mm plug without load. Not the most efficient to step 12v up to 20v only to have it regulated by the charge controller and brought back down to 12v, but the DC to DC charging will only be done when the truck's solar setup has tons of power to spare mid-day.
#USB C TO BARREL PORTABLE#
This allows me to charge the portable packs from solar, or from the truck's aux 12v system using a 20v capable USB-C PD car charger. Ultimately, I settled on plumbing my power inlet to a solar charge controller.
#USB C TO BARREL HOW TO#
I fretted over how to do DC to DC charging for this purpose and the price of the recommended - reliable - trusted offerings. I wanted to charge portable 12v lithium(lifepo4) battery packs from my truck's auxiliary battery in the bed. Absolutely awesome to bring USB PD to other applications. I have three of these, all from different sources, but they're identical in every way.
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