Elevators has very serious regulations.
Latest one in our country is EN 81-20
i have worked in a company that produces
elevator controller cards and its all other components,
my job was the designing the pcbs and
writing the programs according to the standards
as a part of a team.
If you want to take the responsibilities
you can make modifications
but i do not recommend this.
As a sensor commonly used one is named
bistable and monostable sensor
it is a hall effect sensor
you have the magnets at the pit
2 for each floor level
1 for door preopening space and
1 up and 1 down slowing level indicator
and sensors at the cabinet.
There is also different layouts for sensor magnet positioning.
