Household Hall earthquake alarm circuit

Working principle of the circuit: Install the alarm on an indoor wall or window frame. If there is
earthquake activity, small magnet B will first feel the impact of the longitudinal wave. When the impact force exceeds
20 g, small magnet B can be moved up and down. Movement, the Hall element outputs high potential, vs
conducts, the buzzer emits a "beep" alarm sound, and the red light-emitting diode LED lights up.
When installing, be sure to keep the small magnet close to the Hall sensor, adjust the distance H within 3 mm,
and adjust the length of the spring to optimize the sensitivity.