The video shows the pinout of timer 555, the connection diagram in bistable mode. In bistable mode, the timer can reside in one of two stable states, that is, in essence it becomes a trigger (switch). Control is carried out by means of two buttons
Timer 555. Self-oscillatory mode • Таймер 555. Автоколебательный режим
Timer 555. Waiting for a univibrator • Таймер 555. Ждущий одновибратор