CHAPTER 6 Building Your Master Plan PART 3 THE 40-PLUS EATING PLAN. Our computer's clock is advancing every day. Previous blog posts for this project: IoT Alarm Clock - Part 4, Invar Pendulum Parts David Walter's new double pendulum perpetual calendar clock is built using several 555 timers. And he accepted my invitation to come to dinner, about three or four months after that. OnTheClock is a online employee time clock system.