Project Rising Waters:
A group of students including myself created a project utilizing the rate of frequency to strobe LED lights to create the optical illusion that water was rising. We created the entire project from scratch. 
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Check it out at Arduino Project Hub: https://create.arduino.cc/projecthub/ahs-advanced-physics/project-rising-water-399d31?ref=search&ref_id=project%20rising%20waters&offset=0