PortaPow USB Power Blocker - Stops Charging, Allows Data (Single Pack)

Does exactly what it is supposed to do and block the +DC power on the USB port but allow data transfer to work. I have this installed on a USB port on a Raspberry Pi5 that uses USB for a serial connection to another device. I didnt want to power this other device with my RPi5. but wanted to use minicom to communicate to it. Works as advertised.

I bought this for controlling my 3D printer with my Raspberry Pi 4. My Creality Ender 3 V2 was pulling power from both the Raspberry Pi as well as its own power and making a bad sounding whine. This let data through without power perfectly. Very glad this product exists.

I wish DATA only cables were more readily available. But, alas, they are not. Sure...you could butcher your own cords and cut that power line, but that is a destructive solution. If you've ever controlled a 3D printer with a raspberry pi or other pocket PC, then you probably have learned that traditional USB cables can send enough voltage through the cord to cause issues with the printer, even with the jumper that is supposed to prevent that in place. I bought these to try and stop this compromising current, and, just to varify they work, I plugged a USB powered light into one, and...no power was going to the light. So, I used it with my printer, and it does the job I need very well, and very affordably. I love these. I will probably buy some just to have in stock for a tinkering project where I might need one.

Works great to isolate the 5V from my Raspberry Pi to my 3d Printer. Only wish the connector was smaller as it kind of blocks other USB ports.

TL;DR: It doesn't work with iPhones or apple trackpads. Or pretty much any other self-powered device I have laying around.So, I use an Apple Trackpad with desktop computers - a mac and a pc. If I leave it plugged in via usb, it automatically switches with my KVM. If I don't, I have to manually pair it over bluetooth.After 2 years of being plugged in 24/7, my apple trackpad's battery got bloated, so I'll sadly have to dispose of that one or at least take it apart to get the battery out. We'll see how that goes. In the meantime, I really missed having a trackpad, so I bought another.And I bought this, in hopes that I could use it over USB without charging it. It only needs to be charged once every few weeks, after all!Sadly, without the power source, the trackpad doesn't detect the USB connection. :(So I guess.. 5 star review? I'm sore it doesn't work for my use case, and to be honest, I'm not sure it actually works at all because of that hahaha. Nothing I plugged in detects USB. That's worrisome. Try it anyway? It's only $6.50 and it's a nice little dongle.

Works perfectly as described

NOT FOR APPLE CARPLAYBought it to be able to run apple play in my car without charging phone and it won't do that. It just fully disconnects the phone (data and power wise). I'm sure it works for it's niche purpose, but doesn't work for your car. I meant to return, but forgot until the window had passed.

If you use a Raspberry Pi to control a 3D printer, you'll likely find that the 3D printer pulls power from the Raspberry Pi and causes issues (either with the Pi itself or the 3D printer has random failures since it can't draw the power it needs).You can always take a USB cable and cut one of the power traces - that's the cheapest way to solve this issue if you don't mind potentially destroying a cable for other uses.I'd prefer to use regular USB cables with the Pi so I don't mind paying for this adapter to perform that same function in a non-destructive way. I've ordered two of these for two different Pi + printer setups (both Sovol SV06 and SV06+ machines) and both worked perfectly.