5. Concept selection. - P-Division-2022-2023-Odd/Repo05 GitHub Wiki
5.1 Assign weights to objectives.
| Objectives | Weights | |
|---|---|---|
| Safety | 5 | |
| Ease of use | 7 | |
| Portability | 4 | |
| Use of standard parts | 8 | |
| Cost | 6 |
5.2 Pugh chart for the four alternative designs
| Design Objectives | Weights | Design 1 | Design 2 | Design 3 | Design 4 | |
|---|---|---|---|---|---|---|
| Safety | 5 | 0 | + | Datum | + | |
| Ease of use | 7 | + | ++ | Datum | + | |
| Portability | 4 | 0 | 0 | Datum | 0 | |
| Use of standard parts | 8 | ++ | -- | Datum | + | |
| Cost | 6 | ++ | -- | Datum | - | |
| Score(+) | 35 | 19 | 20 | |||
| Score (-) | 5 | 28 | 6 | |||
| Total | 30 | -9 | 14 |
5.3 Justification of the score given
Design 1
| Objectives | Score | Justification |
|---|---|---|
| Safety | 0 | Same as that of Datum |
| Ease of use | 7 | Easy to use |
| Portability | 0 | Same as that of datum |
| Use of standard parts | 16 | Uses very easily accessible parts |
| cost | 12 | Very cost efficient |
Design 2
| Objectives | score | Justification |
|---|---|---|
| safety | 5 | As it involves sliding mechanism |
| Ease of use | 14 | can be easily operated |
| Portability | 0 | same as that of datum |
| Use of standard parts | -16 | Uses specific parts |
| cost | -12 | Very costly as it involves expensive mechanism |
Design 3
| Objectives | score | Justification |
|---|---|---|
| safety | 0 | Reference |
| Ease of use | 0 | Reference |
| Portability | 0 | Reference |
| use of standard parts | 0 | Reference |
| costs | 0 | Reference |
Design 4
| Objectives | Score | Justification |
|---|---|---|
| Safety | 5 | safe as it uses foldable roof |
| Ease of use | 7 | Can be easily operated |
| Portability | 0 | same as that of datum |
| Use of standard parts | 8 | Parts can be easily accesible |
| cost | -6 | Little costly as it require multiple parts |
FINAL DESIGN
SINGLE CRANK MECHANISM
Mechanism
- Components required- 2 motors, 2 Shaft.
- Attach dc motor to nylon rod which holds shaft which in turn connected to roof of the green house
- Connect the Arduino board to the DC motor.
- Write a program in Arduino IDE which controls the movement of DC motor.
- Upon the indication of rain, motor moves in the anticlockwise direction which in turn closes the roof.
- When it stops raining the DC motor moves in clockwise direction which in turn open the roof.
- In this way we can control opening and closing of roof of the
Green house. Through simple DC Movement.