ADAPTER SIZING

SL.NO.	Components	Capacity	Quantity	Total Capacity
1	Arduino	12V,80 mA	1	80 mA
2	IR Sensor	5V,40mA	1	40 mA
3	relay module	5V,80mA	2	160mA
4	Stepper Motor	12 V,1200mA	2	2400mA

Voltage Ratings	Current Ratings
12V	2480 mA=2.48 A
5V	200 mA=0.2 A

After APPLYING FACTOR OF SAFETY (FOS) :- FOS = 1.2 Total ratings:-

Voltage Ratings	Current Ratings
12 V	2.48 x 1.2=2.976
5 V	0.2 x 1.2=0.24

Hence we will use two adapters of 12V,3 A and 5V,0.3A

MOTOR SIZING

We will use 2 stepper motors (NEMA 17)

• Rated Voltage:12 V DC
• Current:1.2A at 4V
• No. of phases:4
• 200 steps per revolution,1.8 degrees

Mass= Mass of roller + Mass of papers

Mass of papers = 0.14Kg

Mass of Roller = Density of rod (1.14) x Volume of Roller (21.991)

Mass of Roller = 0.025Kg

Total mass=0.165Kg

F = µmg [coefficient of friction = 0.6]

F = 0.6x1.65=0.99N

Torque = F x D/2

Diameter/2 = 1 cm

Torque = 0.99x 1= 0.9 Kg-cm

Safety factor (FOS) = 1.5

Final Torque = 1.5 x 0.99 = 1.485 Kg-cm

We will use a 100 RPM and 12 V Centre Shaft DC Geared Motor.