Manulobo22
Posts: 4
Joined: Sat Oct 05, 2019 9:28 pm

Raspberry Pi 4 USB power problems

Mon Nov 11, 2019 2:17 am

Hello everybody !!

I have a big problem using Raspberry Pi 4, in relation to the USBs. I have a TPLINK USB connected to the RPI and an USB camera too. I want to send camera images over WIFI. I tested using mi PC and all works fine, but when i use the RPI, it's like the camera doesn't have enough power, because the images are sending very slow. I have a power adapter 5.25V 3A.

Whats happen ? How can i send more power to my USB devices? I have already added the max_usb_current=1 into my config.txt.

Thank you so much.

User avatar
Imperf3kt
Posts: 2857
Joined: Tue Jun 20, 2017 12:16 am
Location: Australia

Re: Raspberry Pi 4 USB power problems

Mon Nov 11, 2019 2:34 am

The USB current limit config setting does nothing on any Pi released after the 2b

A slow transfer sounds more like a a cheap micro sd card issue rather than a power problem.
55:55:44:44:4C
52:4C:52:42:41

RossDv8
Posts: 132
Joined: Thu Jan 21, 2016 12:35 pm

Re: Raspberry Pi 4 USB power problems

Mon Nov 11, 2019 3:00 am

I solved my USB hard drive problems by using USB splitter cables. These cables are fairy cheap on ebay or amazon or maybe at your computer store. They have two male USB plugs and a female USB socket. One male USB plug has a RED marking (on mine is it like RED shrink wrap). This end goes into a 5V USB POWER adapter and gets power for the USB device . The male USB plug WITHOUT the RED marking is for Data and it goes into the Pi USB port.

Then the USB device is plugged into the FEMALE USB socket of the splitter cable. If all works well, the camera will get extra power through the splitter cable.

I use these regularly with power hungry external USB drives, but have not tried with anything else. However it 'should' work with a camera..
Pi 4B 4GB - system on WD 240G SSD ( but /boot on Sandisk microSD)

drgeoff
Posts: 9874
Joined: Wed Jan 25, 2012 6:39 pm

Re: Raspberry Pi 4 USB power problems

Mon Nov 11, 2019 9:03 am

Manulobo22 wrote:
Mon Nov 11, 2019 2:17 am
but when i use the RPI, it's like the camera doesn't have enough power, because the images are sending very slow. I have a power adapter 5.25V 3A.

Whats happen ? How can i send more power to my USB devices? I have already added the max_usb_current=1 into my config.txt.
1. I cannot tell you why it is slow but I can say it isn't caused by lack of power to USB devices.

2. Even if it were due to lack of power, that max_usb_current config does nothing on a RPi4B.

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