responding to "ctx32" on "On/Off switch"

The Thread Prototype Breadboard has a circuit that is connect to a Vex Digital Output port… A relay could be substuted for the LED and Resistor, but you need to be vary careful that the Relay “coil” not exceed the Vex Digital Output port’s “current limit” (re PWM Outputs and Using non Vex parts).

VexLabs page Vex Robotics Design System says that “As outputs these ports can drive an open circuit to 0.6v or lower for a low and 4.0 volts or higher for a high. They can drive a 1 mA load to 1.6v or lower for a low and 3.0 volts or higher for a high.”