Need statement: Home automation

3.1 Question and answer

Table 1: Question and answers

SI no.	Questions	Answers	Objective/Function/Constraint
1	How much should the smart doorbell security system cost?	Try to make it within Rs.4,000.	Constraint
2	Should the system be contactless?	Yes the system should be contactless.	Objective
3	Should the doorbell automatically sense arrival of people?	Yes it should automatically sense arrival of people once they show their hand to the sensor/system.	Function
4	Should the doorbell ring suddenly after sensing the arrival?	Yes once it senses arrival the bell should ring.	Function
5	For how long should the bell ring?	The bell should ring at least for 3 secs.	Constraint
6	Do you want a camera with the doorbell system?	Yes there should be a camera with the doorbell system.	Objective
7	Should the camera send you pictures or video recording?	The camera should send pictures or live stream.	Function
8	Do you want a single picture or more pictures?	It should send as many pictures as we want.	Function
9	Should it send the pictures to you only when there is internet connection or even without the internet?	It should send the pictures with internet connection.	Objective
10	Do you want the pictures to be send with a notification?	Yes pictures should be sent with a notification.	Function
11	After seeing who has arrived at your doorstep do you want to unlock the door manually or want to unlock with your phone?	We want the facility to unlock the door with the phone.	Objective
12	Should there be a light which should turn on indicating that the door is unlocked?	Yes it should have a light to inform people that the door is unlocked.	Function
13	What should be the warranty for the system?	It should 1 year warranty.	Constraint
14	Should it system have a battery supply or a power supply?	It should have a battery supply.	Objective
15	What should be the weight of the system?	The weight should be less than 500 grams.	Constraint
16	Should it be fixed or portable?	It should be fixed.	Objective
17	Do you want only one fixed cell phone to be connected to the system or based on your convenience?	It should be based on our convenience which cell phone we would want to connect.	Objective
18	What should be the length and width of the machine?	Length should be 20 cm and width should be 10cm.	Constraint
19	Should the system be user friendly?	Yes the system should be user friendly.	Objective

1.2 Identifying Client's Objectives

Table 2: Objectives Identified

SI no.	Ojectives
1	The system should be contactless.
2	There should be a camera with the doorbell system.
3	The camera should live stream in the app .
4	System should also have a facility to unlock the door with phone.
5	The system should have a battery supply.
6	System should be fixed.
7	It should be a user friendly system.
8	The system should be connected to any cellphone based on user's convenience.

Problem definition version 1.1:-Design a semi-automatic contactless doorbell security system which contains a camera, have the facility to unlock the door with the help of smartphone and also have a provision to connect with multiple cellphones. The system should be fixed, works on battery supply and should be user friendly.

1.3 Identify Constraints

Table 3: Identified Constraints

SI no.	Questions
1	Cost of the machine should be within Rs.4000.
2	The bell should ring for atleast 3secs.
3	Machine should have a warranty of 1 year.
4	Dimensions of the machine should be 20cmX10cm.
5	Machine should weigh less than 500 grams.

Problem definition version 1.2:-Design a semi-automatic contactless doorbell security system which contains a camera, have the facility to unlock the door with the help of smartphone and also have a provision to connect with multiple cellphones. The system should be fixed, works on battery supply and should be user friendly . Weight of the machine must be less than 500 grams and the cost to build the machine must not exceed Rs.4000. The dimension of the machine should be 20cmx10cm along with a warranty of 1 year. The bell should ring for atleast 3secs.

1.4 Establish Functions

Table 4: Identified Functions

SI no.	Questions
1	Automatically sense the arrival of people by scanning their hand.
2	Ringing of bell once the machine senses the arrival of people.
3	The camera should live stream in the user's phone.
4	Should have a light to inform people that the door is unlocked once the light blinks.
5	The machine should send as many pics as the user wants

Problem definition version 1.3:-Design a semi-automatic contactless doorbell security system which contains a camera, have the facility to unlock the door with the help of smartphone. The system should be fixed, works on battery supply and should be user friendly . Weight of the machine must be less than 500 grams and the cost to build the machine must not exceed Rs.4000. The dimension of the machine should be 20cmx10cm along with a warranty of 1 year. Once the person's hand is sensed by the machine the bell should ring . Also if the door is unlocked by the user it should be informed to the visitor by turning on the green light.