Consider that a school has a total of eight periods with a lunch break after the fourth period. Each period is 45 minutes long, while the duration of the lunch break is 30 minutes. To ring this automatic school bell to start the first period, the peon needs to momentarily press switch S1. Thereafter, the bell sounds every 45 minutes to indicate the end of consecutive periods, except
immediately after the fourth period,when it sounds after 30 minutes to indicate that the lunch break is over.
Showing posts with label automatic bell. Show all posts
Showing posts with label automatic bell. Show all posts
Subscribe to:
Posts (Atom)
