Mechanical Design & Machine Design

 
Group Assignment
  *  Design a machine that includes mechanism + actuation + automation.
  *  Build the mechanical parts and operate it manually.
  *  Document the group project.
  *  Actuate and automate your machine.
  *  Document the group project

  
 Individual assignment
  * Document your individual contribution.
  
My Idea:
In this assignment I decided to make a robotic arm due to my need in teaching Robotics in the college.

I designed the arm using CorelDRAW and Inkscape softwares.
   
After that I cut the design using Laser cutter machine.
   
   
Assembling it using servo motors:
   
Finally, using an Arduino UNO to control the arm by sending commands via serial monitor:
   

First Code:

#include <Servo.h>

  Servo myservo; 
  Servo myservo1;
  
  int pos = 90;   
  
  void setup() {
    myservo.attach(9);
    myservo1.attach(6);
    Serial.begin(9600);
    myservo1.write(90);
    myservo.write(90);
    }
  
  void loop() {
    while (Serial.available() > 0) {
      
     if (Serial.read() == 's') {
        myservo.write(180);          
       }
     if (Serial.read() == 'a') {
        myservo.write(120);     
       }
     if (Serial.read() == 'q') {
        myservo1.write(180);           
       }
     if (Serial.read() == 'w') {
        myservo1.write(0);            
       }
      }}
  
Test 1:

  
  In this test I found a problem in the code, the Arduino doesn't response to the commands expect first one.
  After reviewing the code I detect the error in reading from serial.

  Final Code:

#include <Servo.h>
 
    Servo myservo;  
    Servo myservo1;
    
    char Val;
    int pos = 0;    
    
    void setup() {
      myservo.attach(9);
      myservo1.attach(6); 
      Serial.begin(9600);
      myservo1.write(90);
      myservo.write(90);
      }
    
    void loop() {
      while (Serial.available() > 0) {
        
      Val= Serial.read()
        if (Val== 's') {
          myservo.write(180);              
         }
        if (Val == 'a') {
          myservo.write(120);             
         }
        if (Val == 'q') {
          myservo1.write(180);             
         }
        if (Val == 'w') {
          myservo1.write(0);             
         } 
    }}
    

Final Test:
After modifing the code it works good:
 
  

  
Download Links
    Arm Design:
    Arm Design
    Arduino Code:
    Arm control