how to increase Raspberry Pi USB current limit
As is well known, USB devices are powered almost without exception via the USB to whose host they are connected. No matter whether USB hard disk, USB stick, WLAN adapter, mouse or keyboard. When taking power, these devices are sometimes quite relentless, which is no problem at the USB ports of a standard PC. Officially, USB 1.1 only allows 100 mA and USB 2.0 only 500 mA. Despite these limitations, the motherboard manufacturers are not the nakedness to install weak USB ports. In practice, USB devices can draw significantly more than 100 or 500 mA.
On a Raspberry Pi, powering through the USB ports is a tricky business. If mouse and keyboard and maybe even one or the other USB stick is connected, then that’s no problem. But if you work with external hard drives or power-hungry Wi-Fi adapters, then the power supply of Raspberry Pi breaks down. But this has not directly to do with Raspberry Pi, but with its power supply from a wall adapter, which is often a charger and not just a real power supply.[Read more…] about increase Raspberry Pi USB current limit