This hack was built for [Hlesliebole]’s Nikon D3100, but he says it should work with any DSLR and remote shutter. This initial build uses an LED as a stand-in for the remote shutter that he ordered.

Laser Timer Ramp Last Updated: 7/27/18. Teaching ... Also, this module focuses on how to time events using Arduino’s built-in function millis(). It is designed to be used with a pre-built ramp that ...

It’s built using a ton of switches and LEDs, powered by an Arduino and a bunch of USB controllers. As absurd and complex as it is, it’s still surprisingly functional.