Hardware & electrical notes

WE DO NOT TAKE RESPONSIBILITY FOR ANY DAMAGE. Use this software on your own risk.

Models

There are various models based on the same (or compatible) V-USB microcontroller: for 250V AC, 12V or 5V DC, with full-size or mini USB connectors; one, two or four relays. E-Bay merchants provide the scheme and details on the electric connections.

USB compatibility issues

Some relay models we've seen (red colored PCB, blue 250V relays) fail to detect properly on number of PC computers (error messages are like "USB device not recognized", "error reading descriptors"...).
A workaround we've found is to connect the board thru a USB 1.1 hub.
(high-speed USB 2.0 hubs do not seem to help with this issue).

Under Linux, these devices usually are detected on same computers without errors.