Step 14: Attach the cable

Picture of Attach the cable

Peel back the jacket of the USB cable to expose 4-colored wires.

Attach these wires to the circuit board as follow:

Green - 2N3904 transistor ground
White - Junction of 0.1uF and 10K resistor
Red - SPST 5V relay switch
Black - Circuit ground

...or just look at the schematic again.