For our take on the unconventional switch assignment, we decided to include a practical design aspect, which involves hanging keys up on a lanyard. The reason we chose this line of reasoning is because it reflects something common and mundane that most people wouldn't typically think twice about. In many ways, taking a key off or placing it on a lanyard is often a means to an end, serving as a step towards another goal, so we decided to intentionally showcase this often-overlooked step.
We utilized the conductivity of the key ring and the conductive portion of the lanyard (the metal ring). By attaching an alligator clip to each of these components, the green LED would turn on once the key ring was clipping onto the lanyard, closing the circuit by touching one another. Then, once the key is unclipped, the circuit is opened and the LED turns off.
Switch Circuit Schematic:
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