Set multiple days and times to ring.
(Duplicate Bell sprites to set as many alternative timelines as you need.)
⚪ = on/off
〓 = set alarm times and days
▶ = play/stop the bell (now)
Change the sounds in the sprite for different bells. It'll cycle through them if there is more than one.
Note:
As this is for school bells you can't set a bell after 6 pm or before 6 am
Thanks to all my teachers, who tried in vain to convince me that Maths and spelling were useful. If I'd listened then this project would have been much easier. :)