CORE 112-5: Make a Pull-String Switch

Great for doorbells and trip wires!

In this class you’ll learn how to use a Control Knob ATOM to make a pull string switch. The video shows the ATOMS screwed onto the inside wall of a wooden playhouse for a permanent application as a doorbell, but see below for a LEGO-based (no screws) version.

ATOMS used:

ATOMS circuits demonstrated in video:

Class 5 Schematic [pdf]

Alternative, LEGO-based, example:

Building Instructions [pdf]


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