Add scheduled do not disturb function to the phone

Relevant key device information used in this article: PC817 The resistor R1 in the figure uses a 1/4 W carbon film resistor, and the rest all use 1/16 W carbon film resistors. ICl and IC2 use PC817 photoelectric couplers, and D5 uses a Φ3mm blue high-voltage resistor. The brightness light-emitting tube is fixed at the appropriate position on the panel. V3 and V4 are best used in pairs. The B value is >150. The parameters of the other components are marked in the figure.