2 channel micro usb relay module is equipped with a stable usb to serial port chip and a microcontroller.
Relay switch box usb.
Then they make simple usb power switch ic chips that can be very handy to use for use.
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It can use the serial port debugging software to send serial commands on the computer to control the opening and closing of the 2 channel relay.
It has one onboard 5v dc relays that can switch up to 2a load.
Use 1 mux chip and two of the power switch ics and you will not require any relays or relay coil drives and catch diodes.
The relay switch box usb can work without a power supply as it is connected and powered via just a 5v usb port.
Endgroup michael karas feb 28 16 at 15 12.