[DonRotolo]

To amplify on Al's remarks: You do not need a double-pole switch to switch between 0 and 1 (if that is your intent): A single pole will do fine.

To wire this, simply connect one side of the switch to ground and the other side to the spike input. Also on the other side connect a 10,000 Ohm resistor (1/8 or 1/4 watt would be fine) to your voltage source (5V if you want to control a spike).

When the switch is closed the spike sees ground (as you would expect). The minimal current flowing through the "pull up" resistor will not affect this. When the switch is opened, the voltage source will appear on the 'spike' side of the switch. This happens because the input resistance (impedance, actually) of the spike is several orders of magnitude greater than 10,000 Ohms.

This is how these things are done. Good luck.