In our first reed switch tutorial, Magical Magnetism: Intro to Reed Switches (Normally Open), we introduced the most common type of reed switch, demonstrated how to use one in a circuit, and showed how to make a magnetic wand that can trigger any circuit you make with one.
In this follow up tutorial, Magical Magnetism: Intro to Reed Switches (Normally Closed), we’ll continue our exploration of magnetic switches by introducing you to a less common type of reed switch (“normally closed”) that has a slightly different look (bumpy) and functionality (like a refrigerator door).
We will also be showing you how to apply this type of switch in an electrified version of a Victorian Era valentine called a “cobweb,” a type of mechanical card that is characterized by its web-like top layer that lifts up to reveal a hidden message or image. Like a refrigerator door light, that only turns on when the door is open, our cobweb card will light up when its top layer (concealing a well-placed magnet) is lifted.
To learn about key differences between two types of reed switches, and how to make a piece of interactive art that lights up when it’s lifted, check out our latest tutorial, Magical Magnetism: Intro to Reed Switches (Normally Closed)!