Assistive Domotics: Logical Design of Automated Door in a Smart Home

Background

Assistive technology is the form of home automation which includes assistive, adaptive, and rehabilitative devices for people with disabilities and also includes the process used in selecting, locating, and using them. Microsoft Corporation’s C.E.O. Steve Ballmer once said ”The number one benefit of technology is that it empowers people to do what they want to do.It lets people be creative. It lets people be productive.” The US Census Bureau has projected that by 2010 13% of the population will be 65 or older (Cheek 2005). The bureau has also projected that by 2030 there will be 9 million Americans older than 85. Providing the physical facilities of health and security personnel will be a tough task because the cost will be massive.So automated machines will be the best cost effective alternative.


History of Assistive Domotics

Today every embedded device are automated to some extent in order to ease the users. Nikola Tesla’s design of first remote-controlled boat(1785 A.D) is the first known automated device in history.Mentioning about home automation in the early 1930s World’s Fair models fictional were exhibited in order to excite the spectators. Then the invention of Complex Number Calculator (CNC) in 1940, mouse in 1964, Mac OS in 1984, first wireless system in 1989 are other different development in automation.In 1984, home automation technology spreads to garage doors, security systems, infra-red control , fiber optics and many more. Likewise a separate section named as assistive domotics was started and it emphasized the development of automated appliances for the elderly and disabled people.


Machines for Assistive Automation

A Home Robot

A home robot is a mobile device for moving about, performing tasks such as vacuuming, measuring, communicating, fetching objects etc. This device is useful for the elderly people who have problem with ageing and back pain. Many of their daily activities will be solved by this home robot.



Assistive Bed

Assistive bed is an externally monitored machine special designed for elderly and disabled people with spinal cord disabilities or paralysis.This device functions when the user rests in the bed, the string like structure will expand and contract calculating the mass weighed by it.

Designs in Smart Home

The development of home automation is in its early stage.Many researches in the filed of automation is going on.There are obstacles in building a completely automated system. None of the existing system in the world are completely automated by itself. The main reason behind it is machine needs external factors like human, electricity to begin its function.

Design of Automated Door

Scenario
A security code must be entered in order to open the door and enter inside the house. Same scenario is represented below with the help of context diagram and transition diagram.

State Definition
Here automated door is deterministic in nature and the system consists
of three states: 
Q = MainDoor,PasswordCheck,MainHall,
two input symbols authorized as ’1’ and unauthorized as ’0’ i.e. ∑= 0,1
starting state q0 is MainDoor i.e. q0 = MainDoor
and final state F is MainHall i.e.  FMainHall
A transition table of illustrating the states involved while entering to main
hall is represented below.

Context Diagram
Below is the context free diagram which clearly shows the work mechanism of an automated door:

Transition Table
Transition Table of automated door as per the context diagram is shown below:






Transition Diagram
Transition diagram of the automated door is shown below:










Conclusion
This research was conducted as a partial fulfillment of course "Automata and Formal Languages". The topic was chosen seeing the potential of automation in houses and business complex. Now with this logical design we can simulate the result using functional/procedural programming languages like LISP and PROLOG for convenience. I've also designes another logical implementation of the movement of wheel chair within a smart house. This can be seen in the reference paper.

Reference:

Assistive Domotics: Logical Design of Automated Home and Movement of Wheelchair in a Smart Home, Sanjog Sigdel,Published on: Research Gate,  [accessed Jan 29, 2017].