In the market we can find standard solutions for access control to
places. The problem is when we want that solution suits our needs. In
the enterprises incubator in Almansa, it was necessary that the Access
Control should indicate to the users when the building was empty so as
to proceed to close the facilities.
To fulfil these premises and make it easy for users we designed an application with a microcontroller that reads the RFID keychains of each user at the entrance and at the exit, knowing in this way the number of people who are in the building and indicating it by a display way.
Tell us what you need and we will make it our next project.