Weight Distribution

Objectives	Weights
PRODUCTION COST	8
AESTHETICS	6
SAFETY	7
POWER EFFICIENCY	10
COMPLEXITY IN USAGE	9
PORTABILITY	5
RANGE	1
STABILITY	4

Pugh Chart

Design Objectives	Weight	Concept 1	Concept 2	Concept 3	Concept 4
Production Cost	8	+	0	DATUM	+
Aesthetics	6	-	+	DATUM	0
Safety	7	+	++	DATUM	0
Power Efficiency	10	- -	0	DATUM	- -
Complexity in Usage	9	+	+	DATUM	0
Portability	5	-	0	DATUM	0
Range	1	0	+	DATUM	0
Stability	4	++	+	DATUM	0
Score (+)	—	32	34	0	8
Score (-)	—	31	0	0	20
Net Total	—	1	34	0	-12

Justification for Pugh Chart Scores

Design No.	Objective	Score Allocated	Justification for the Score
1	PRODUCTION COST	8	Uses cheap components like basic telescopic arm.
	AESTHETICS	-6	Rigid telescopic tube provides basic functional aesthetic.
	SAFETY	7	Lithium-ion battery presents moderate thermal runaway risk.
	POWER EFFICIENCY	-20	Ultrasonic sensor continuously consumes active sensing power.
	COMPLEXITY IN USAGE	9	Straightforward telescopic adjustment provides simple operation.
	PORTABILITY	-5	Fixed clamp base restricts easy overall device relocation.
	RANGE	0	Directional ultrasonic sensor offers standard proximity range.
	STABILITY	8	Heavy mechanical desk clamp delivers excellent base stability.
2	PRODUCTION COST	0	Articulated arm and tripod structure increase cost.
	AESTHETICS	6	Sleek articulated arm delivers modern visual appeal.
	SAFETY	14	LiFePO4 battery offers superior high temperature safety.
	POWER EFFICIENCY	0	Passive PIR sensor minimizes standby power consumption.
	COMPLEXITY IN USAGE	9	Multi-joint articulated arm allows quick effortless positioning.
	PORTABILITY	0	Folding tripod base ensures convenient quick transport.
	RANGE	1	PIR motion sensor provides broad detection area coverage.
	STABILITY	4	Three-legged tripod base gives reliable standalone balance.
3	PRODUCTION COST	0	DATUM
	AESTHETICS	0	DATUM
	SAFETY	0	DATUM
	POWER EFFICIENCY	0	DATUM
	COMPLEXITY IN USAGE	0	DATUM
	PORTABILITY	0	DATUM
	RANGE	0	DATUM
	STABILITY	0	DATUM
4	PRODUCTION COST	8	Simple four-bar linkage mechanism lowers manufacturing costs.
	AESTHETICS	0	Exposed linkage joints present basic industrial appearance.
	SAFETY	0	Standard Li-ion battery requires moderate safe handling.
	POWER EFFICIENCY	-20	Active ultrasonic motion sensor increases power draw.
	COMPLEXITY IN USAGE	0	Mechanical linkage moves along single predictable plane.
	PORTABILITY	0	Compact suction cup mount allows quick detachable travel.
	RANGE	0	Ultrasonic sensor provides narrow directional detection range.
	STABILITY	0	Suction cup base offers temporary smooth surface mounting.

Selected Design

1. Motion Sensing : PIR Sensor
2. Rechargeable Battery : LiFePo4 Battery
3. Controller : ESP32
4. Illumination : RGB LED
5. Base Stability/Attachment Method : Tripod
6. Movement Mechanism: Articulated Arm

Product Architecture

Part / Component	Function
PIR Sensor	Detects human motion via infrared radiation changes.
LiFePO4 Battery	Provides safe and durable rechargeable power source.
ESP32 Microcontroller	Controls sensor data and handles system processing.
RGB LED	Serves as the primary adjustable illumination source.
Articulated Arm	Allows flexible positioning across multiple movement axes.
Tripod Base	Offers stable standalone support and high portability.
Voltage Regulator	Steps down and stabilizes the operating voltage.
Charging Module	Manages safe battery recharging and prevents damage.
Micro Servo Motor	Controls precise angular movement of articulated joints.

Function Clustering

Interaction Between Subsystems :

Subsystem List

Sl. No.	Subsystem	Component / Description
1	Sensing Unit	PIR Sensor
2	Controller Unit	ESP32
3	Lighting Unit	RGB LED
4	Mechanism	Articulated Arm

Interaction Details

Subsystem 1

Subsystem 1	Subsystem 2	Subsystem 3	Subsystem 4	Interaction details
Spatial	NO	NO	YES	The PIR sensor detects motion and sends the signal to the ESP8266 for processing. It triggers the RGB LED through the controller.
Data	YES	NO	NO
Material	NO	NO	NO

Subsystem 2

Subsystem 2	Subsystem 1	Subsystem 3	Subsystem 4	Interaction details
Spatial	NO	NO	NO	ESP32 receives signals form PIR sensor and carry out the lamp operation. Then it sends signals to RGB LED to switch it ON/OFF.
Data	YES	YES	NO
Material	NO	NO	NO

Subsystem 3

Subsystem 3	Subsystem 1	Subsystem 2	Subsystem 4	Interaction details
Spatial	NO	NO	YES	The RGB LED responds to the motion detected by the PIR sensor through signals processed by the ESP32. It is physically attached to the gooseneck.
Data	NO	YES	NO
Material	NO	NO	NO

Subsystem 4

Subsystem 4	Subsystem 1	Subsystem 2	Subsystem 3	Interaction details
Spatial	NO	NO	YES	Provides physical support and positioning. supports the LED and allows directional and height adjustment.
Data	NO	NO	NO
Material	NO	NO	YES