Oscilloscope-Clock

Arduino-based analog clock drawn on an oscilloscope in X-Y mode

Generates analog signals via a low-pass filter of PWM output.

Clock can be advanced by a push button.
DELAY may need to be tuned for your scope (I used a Tektronix TBS 1202B-EDU).

Optionally supports a real-time clock (DS3231) for more accurate time keeping.

(Inspired by https://neil.fraser.name/news/2018/clock.html and https://blog.arduino.cc/2018/12/27/draw-on-an-oscilloscope-with-arduino/)