Auto Reset of a USB Device.

Don't we all hate having to unplug then re-plug a usb device if it has stopped responding? My USB UIRT is the key to my home access and comfort automation. Occasionally it locks up and I must either re-plug it or reboot the pc.

Here is how I fixed this madness using my existing Labjack U3/flowstone based home automation system.

You can of course use a programmable timer relay to cycle power for a few seconds each day if you don't have a home automation system like I do.

Putting a New 5Volt Power Lead.

Basically I removed the 5Volt power lead from the UIRT circuit board and substituted a separate wire for 5Volt power. The new power lead will have its power cycled OFF via a normally closed relay contact.

I have a 5Volt supply from my desktop pc atx psu which will be the new power feed into the USB UIRT.

Hardware and Software to Make the Power Cycle.

I already have a relay card dedicated to cycling power to my internet modem, infrared relays and wifi router. I simply used another relay just for 5V switching. These relays inputs are connected to a Labjack U3 digital out channel.

The software I developed in Flowstone provides automatic and manual switching to cycling power i.e. turn on and off the relays.

Completion!

After having the new 5Volt power lead connected to the 5Volt relay NC contact, I secured the USB UIRT in its new location and now my home automation system for home access and comfort has auto healing capabilities!