The ESP32 drives the steppers via L298N H-bridge drivers, but it’s hard to say if there’s an RTC chip or if the microcontroller is just getting time via an NTP server. 3D-printed spools are loaded with the cards, which are then attached to frames that hold a stepper motor and a Hall-effect sensor. started the build by making the flip cards themselves, a process that takes some topological tricks as well as a laser cutter. Unfortunately, the video below is all we have to go on to get the story behind this clock, but it’s pretty self-explanatory. Granted, ’s ESP32-based flip clock is worlds apart from the flip cards of the “I Got You, Babe” era. Apart from yard sales and thrift stores, though, they’re a bit hard to source - unless you roll your own, of course. These entirely electromechanical devices had their own charm, and they have a certain retro cachet these days. Before LEDs became cheap enough to be ubiquitous, flip-card displays were about the only way to get a digital clock.
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