Switches are really simple components. When you press a button or flip a lever, they connect two contacts together so that electricity can flow through them.

The little tactile switches that are used in this lesson have four connections, which can be a little confusing.

Actually, there are only really two electrical connections, as inside the switch package pins B and C are connected together, as are A and D.

This guide was first published on Dec 05, 2012. It was last updated on Mar 08, 2024.

This page (Push Switches) was last updated on Oct 10, 2012.

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