Assign weights to the objectives

Objectives	weights
Safety	9
Ease of use	7
Portability	5
cost	3

PUGH CHART

Design Objectives	Weights	Design 1	Design 2	Design 3	Design 4
Safety	9	+	Datum	+
Ease of use	7	-	Datum	--	+
Portability	5	-	Datum	+	0
cost	3	0	Datum	-	+
Score(+)		+9	0	+14	+10
Score(-)		-16	0	-17	-13
Total		-7	0	-3	-3

5.1 JUSTIFICATION FOR THE GIVEN CHART

Design No.	Objective	Score Allocated	Justification for the score
1	Safety	+	the outer frame maintains safety
	Ease of use	-	mechanism makes it difficult to draw
	Portability	-	difficult to carry along
	Cost	0	same cost
2	Safety	Datum	Used for comparison
	Ease of use	Datum	Used for comparison
	Portability	Datum	Used for comparison
	cost	Datum	Used for comparison
3	Safety	+	battery used is of low voltage and it does not have electrical hazards
	Ease of use	--	the intreface is difficult for the user
	Portability	+	light weight easy to carry
	Cost	-	it is very expensive
4	Safety	-	it has gear drive containig sharp edges
	Ease of use	+	it has wheels which make it easy to move
	Portability	0	easy to move
	Cost	+	only one sensor is used which is of low cost

5.2 Selected Design

5.3 PRODUCT ARCHITECTURE

FUNCTION CLUSTRING

INTRACTION BETWEEN SUBSYSTEMS

Sensing unit	designing unit	indication unit
Special	yes	yes
Data	yes	no
Meterial	no	yes

designing unit	indication unit	sensing unit
special	no	yes
Data	no	no
Meterial	yes	no

indecation unit	sensing unit	designing unit
Special	no	yes
Data	yes	no
meterial	yes	no

Circuit diagram