I have always found having a bell work assignment projected on the screen as students enter class to be an easy routine.  Students sit down and get started on something that is suuuuuuper easy for them to do, and will remind them of what we previously did or get them ready for that day's lesson. ...

Bell ringers will get your students seated and working from the moment the late bell rings. Seated, silent , and on-task.  This activity does not actually include the promise of silence, but you can dream. ...