I did much the same thing (and much more) 10 years ago. I used a RPi as well as a Canon point-and-shot out my window. My pics were 1 per minute.

Here is a link to the keogram section (I didn't know the term), but watch the whole video, I did a bunch of other art:

https://youtu.be/Mfo4hVc71Qw?si=3YKojggkTj2xehAB&t=2334