2. Method


Levels of  Trials

As our exo arm is using a servo it is vital that we make sure it works properly no matter how many times it is used.Hence we tried it numerous number of times.After many trials we confir that it is working despite 1˚ less or added to our desired angle of rotation.

Angle as of code
Trial 1
Trial 2
Trial 3
Trial 4
135˚
135˚
135˚
136˚
135˚
120˚
119˚
120˚
120˚
121˚
90˚
89˚
90˚
90˚
90˚
75˚
74˚
75
75˚
76˚
60˚
59˚
60˚
60˚
61˚
45˚
44˚
45˚
45˚
47˚

Procedure:

Stage 1:
We saw the steel pole in half.

Stage 2:
Using hinges, attach the two steel poles together.

Stage 3:
Programme the code on the computer.
(Refer to Annex B - Research Data for Code)

Stage 4:
The program to be applied on the Arduino.

Stage 5: 
To change the degree of turning change the part highlighted in red to (e.g. (180, 135))

Stage 6:

Attach the Arduino to the servo with wires.

Stage 7:
Attach all electrical components to the arm and hinges, facilitating arm movement.

Stage 8:
We test it by bending the flex sensor and seeing whether the servo turns the forearm to the desired angle of rotation and test whether it is able to do basic arm movements.

Stage 9:
We also took a photograph of the arm in different angles of rotation and used a protractor to see the angle of degree as of the set-up.

                                                   
          Projected Final version:


IMG-20150125-WA0004.jpgIMG-20150125-WA0001.jpg

IMG-20150125-WA0003.jpgIMG-20150125-WA0002.jpg










      Final Version:














Equipment List:



Equipment
Quantity:
Description:
Specs:
Stainless steel
1
Will constituted the main body of the framework
1 m
Adjustable metal ring/velcro straps
5
Will hold the human arm in place.
Each of them is 50 cm
Servo
1
Will rotate the exo arm.

Arduino
1
Will be programmed to control the motors.

Jumper wire (male & female)
≈ 20 - 30

each 20 cm
Band Saw/hand saw
1
Used to cut Stainless Steel

Drill
1
Used to cut steel etc.
strong enough to cut steel ( )
9v Battery
2
Power source

9V Battery Adapter for the Arduino

1


Soldering iron

1
For the wires

Screws

4

#5 size (3.175mm)

Nuts

4

#5 size (3.175mm)

Corrugated Plastic Sheet

1
Model of arm
100cm x 50cm

Retort stand

1
To hold the model and servo.
With 2 clamps


2.4 Risk Assessment and Management

  • We could have gotten cut or injured while cutting any material.

Cutting itself is very dangerous.As our project involves cutting of corrugated paper etc. , it is vital that we keep this as a risk in our project.This is a part which could hurt us and we must try our best to try and avoid it.

  • We might get burnt while soldering material.

Soldering is needed in our project as there is a huge length between the servo and connections.Due to this, the soldering of wires is essential and soldering iron is needed.The soldering iron is very hot when it is being used.We should always be careful when using it and make sure it is switched off when not in use.

  • We will need adult supervision for activities like cutting metal, soldering, etc.

Adult supervision is necessary as all the above risks such as soldering and cutting has to be supervised by them.through this accidents can be avoided and at the same time you have someone to look up to in a case of emergency.


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