/diy/ - Do It Yourself

>>2513821
>I'm clueless with programming and microcontrollers.

you dont need no stinkin' micro-controller to do something so simple.
just a timer chip (555) and a divider (4017) to increase the delay.
you could replace the 4017 by 4020 or 4040 to increase the division, in which case, you could run the timer
faster, making it easier to calibrate.
(e.g. generate a 0.5Hz square wave, use the 4020 to divide it by 16384 to get a 9 hour delay.)
https://www.circuits-diy.com/multi-stage-adjustable-long-duration-timer/