7.1 Motor Sizing:
We require one DC Motor and one Stepper Motor.
For DC motor,
Calculated mass (approx) = 175g
Torque(in kg-cm) = mass x perpendicular distance
= 175x10^-3 x 10cm
= 1.75 kg-cm (approx.)
| Rated RPM at 12V |
Rated Torque in Kg-cm at 12V |
| 1000 |
0.12 |
| 500 |
0.25 |
| 300 |
0.35 |
| 200 |
0.5 |
| 150 |
0.8 |
| 100 |
1.2 |
| 60 |
2 |
| 30 |
4 |
| 15 |
8 |
| 10 |
12 |
| 3.5 |
30 |
DC motor of 60 rpm is suitable for the calculated Torque at 12V
7.2 Battery Sizing
| SL NO |
COMPONENT |
QUANTITY |
OPERATING VOLTAGE |
OPERATING CURRENT OF EACH COMPONENT |
TOTAL CURRENT |
| 1 |
DC GEARED MOTORS |
1 |
12 V |
300 mA |
300 X 1 =300mA |
| 2 |
STEPPER MOTOR |
1 |
5V |
240 mA |
240 x 1 = 240mA |
| 3 |
AURDINO MEGA 2560 |
1 |
5 V |
100 mA |
100 X 1 = 100mA |
| 4 |
LED LIGHTS |
2 |
3.6 V |
30 mA |
30 X 2 = 60mA |
| 5 |
IR SENSOR |
1 |
5V |
40mA |
40 X 1 = 40mA |
| 6 |
RELAY MODULE |
1 |
5V |
4A |
4 x 1 = 4000mA |
| 12V |
5V |
| 300mA=0.3A |
4440mA=4.44A |
We know that Factor of Safety = 1.5
| 12V |
5V |
| 0.3Ax1.5=0.45A |
4.44Ax1.5= 6.75A |
Hence, 5A adapter can be used for 12V power supply and 10A adapter for 5V power supply.