3.1 List of function

SL.no	Functions from users Perspective	Functions from Designers Perspective
1	Semi-automatic door lock.	Sense the movement at the door bell and the interrupt is triggered.
2		The doorbell camera captures an image of the visitor.
3		The captured image is sent to user's mobile.
4		The notification is sent to the user's phone with visitor's image.
5		The user views the image and gives provision to unlock the door.
6		The system activates a relay connected to the door lock.
7		Door gets unlocked.
8		Green light is shown to visitor in order to indicate that the door is unlocked.

3.2 Function tree

3.3 Morphological Chart

SL.no	Sub functions	Mean 1	Mean 2	Mean 3	Mean 4	Mean 5
1	Sensers	Optical  sensor	IR sensor	PIR sensor	Reed Sensor	Motion Sensor
2	Door	Pivot Doors	Sliding Door	Folding Door	Hinged Door	Fiberglass Door
3	Camera	ESP 32 CAM	WI-FI AC Adaptor Hidden Camera	Clock Radio Hidden Camera	Wireless Hidden Camera	Hardwired Spy Camera
4	Lights	LED mini lights	Fairy lights	Battery powered mini lights	Halogens lamp	Recessed Light
5	Lock	Crank slider mechanism	Spring loaded mechanism	Electro magnetic mechanism
6	Buzzers	Piezo Buzzer	Magnetic Buzzer	Electromagnetic Buzzer
7	Battery	EW battery	HIW battery	Lithium ion Battery	Zinc air Battery	Carbon Zinc Battery

3.4 Function clustering

3.5 Design 1:Gear Mechanism

Design 2:Piston and Cranck Slide Mechanism

Design 3:Rim lock

Design 4:Folding Door

Design 5:nut and bolt mechanism