The circuit is controlled by dual time delay relay. The first time of double time delay relay is adjusted to 12 hours (h), and the second time is also adjusted to 12 hours (h). Just open the door for the first time at 7 am, and then don't move again. If the cycle is continuous for several years, it will automatically turn on at 7: 00 a.m. and turn off at 7: 00 p.m. (except for power failure, no problem.

Circuit diagram:

Physical wiring diagram: