This beginners video (6/9) demonstrates the building of the light circuit for the hydroponics system.
(These lessons assume you have some coding background. If not, visit CodeHS.Org . They provide free user-friendly coding class on Python and other languages that are fun and interactive).
Note: if you follow through Parts 1 & 2 you can use the skills taught to pretty much create anything!
This video is part of a broader "Design & Engineering" course for beginngers that looks at how to build a fully automated hydroponics system to grow one's own food during the winter months. The course includes tutorials on Fusion 360 for Mac users, Inventor for PC users, Python for coding, and circuit building and automation with Raspberry Pi.
(Fusion360 Lessons by Nicholas Auclair, Concordia U. '22, LCC '14 / Raspberry Pi & Coding Lessons by David Surry, LCC '19 / Pre-U '21)