Construct a block diagram and high level state machine (HSM) for a digital circu

Question

Construct a block diagram and high level state machine (HSM) for a digital circuit that counts the number of people in a room. Also, convert the HSM to a finite state machine for the controller part of the circuit. The one door through which people enter the room has a photocell that changes a signal x from 1 to 0 when the light is interrupted. People leave the room from a second door with a similar photocell that changes a signal y from 1 to 0 when the light is interrupted. the datapath circuit consists of and up down counter with a display that shows how many people are in the room.

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