My dog walking through it.What is the beam detecting?
That's a great start. Thank you very much!OK, so a board something like this: https://www.amazon.com/Gikfun-avoidance-Reflective-Photoelectric-Intensity/dp/B07FJLMLVZ/ used with a retro reflector (like a small white bicycle reflector, for example).
With a module something like this: https://www.amazon.com/dp/B07DFT2WDS/
And you can get latches that release when turned on, which is better in general to keep it turned on full time.
Interfacing these two will requite a few components, so if you are up for learning something, an Arduino would be a better way to go than the delay module, and there are plenty of people here who would love to help you learn how.
by Duane Benson
by Jake Hertz
by Jake Hertz
by Duane Benson