Whenever I connect a usb device, it shuts down and won't boot for 3 minutes

Question

when I boot my pi, everything is fine, but when I connect any usb device(they worked before), it just turns off and only will show the red light and a faint green glow for about 3 mins until it works again.

My usb devices are:

Nexxtech keyboard and mouse combo
tp-link WN725N

As i said below, it was working for about 1 year, also i didn't change the usb devices at all @RpiUser123 — patrick, Jul 13 '14 at 20:32
The Pi does tend to reboot when you plug USB devices in, particularly those with a slightly higher power draw. — recantha, Jul 29 '14 at 05:00

score 3 · Answer 1 · answered Jul 13 '14 at 14:08

3

Wireless adaptors needs very high current. Raspberry pi can not supply enough current for them. Use this wireless adaptor with a external powered Usb Hub.

answered Jul 13 '14 at 14:08

Genc Hosting

61
3

it worked before – patrick Jul 13 '14 at 14:15
Did you change the power supply of pi? – Genc Hosting Jul 13 '14 at 16:55
no, i didn't change the pi – patrick Jul 13 '14 at 20:32
The power supply could have gone bad. Like @EnesGenç suggest, try another power supply. – PhillyNJ Jul 13 '14 at 23:08
I think it did go bad – patrick Jul 15 '14 at 15:23

score 1 · Accepted Answer · answered Jul 20 '14 at 23:35

To improve on Enes' answer a bit, the Pi has regulators that will kill the Pi to protect the circuitry if a surge is detected.

Hot-plugging (plugging in a USB device while the host device is running) will cause a sudden jump in current requested, which often will trip these regulators.

This is a known issue, especially with a less powerful PSU. You can combat this by using a more powerful PSU, one that has a higher amperage because a higher amperage is a stronger current; stronger current means better chance of continuous power when more power is requested.

Another thing you can do to stop this from happening is to use an externally powered USB hub, externally and powered being very crucial. This method works because instead of pulling power for the Pi's components (SoC, Ethernet, USB ports, etc.,) all of the power can be used for the USB devices.

Whenever I connect a usb device, it shuts down and won't boot for 3 minutes

2 Answers2