David Hook

A component that opens or closes a loop in a circuit is – yup – a switch. An open circuit means that no current flows, aka it’s off. A closed loop means the loop is continuous and current does flow: on.

In electronics, switches have a number of “poles” and a “throws” (we promise we’re not talking about Olympic javelin throwing).

The pole refers to how many circuits a switch can control, and the throw is how many positions a switch has.

Photo of light switch

You’re probably familiar with this kind of switch

Your basic light switch (and our Switch module) are known as “single pole single throw” or SPST. The Double Switch module is know as a “double pole double throw” or DPDT switch because it controls two circuits with two switches (although both switches are controlled by a single slider).

Picture of Double Switch module

Our Double Switch module controls two circuits