Information about the pendulum construction:
I constructed an electromagnetic pendulum based on a coil. An impulse is sent to a micro relay which charges the coil with 5V. When the coil is creating an electromagnetic filed around itself, the magnet of the pendulum starts moving. The interaction is achieved by sending the impulse when the sound of the dark space stops. Therefore, when the demonstration sound is projected in the dark side of the installation, the pendulum is idle.
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