14. INTERFACE AND APPLICATION PROGRAMMING¶

INDIVIDUAL ASSIGNMENT:

Write an application that interfaces a user with an input &/or output device that you made

GROUP ASSIGNMENT:

Compare as many tool options as possible

Voice controlled robot¶

For the voice controlled robot , I used bluetooth module HC-05. Voice controlled robot is a kind of robot which can be controlled by bluetooth communication. User has the bluetooth app in his/her smartphone. I made this app using MIT app inventor.

Programming Logic or Robot schematic :¶

1] The voice controlled app sends the direction movements of the robot to the bluetooth module HC-05, through voice commands given .

2] The bluetooth module HC-05 will receive the data transmitted from the app.

3] The arduino Uno will read the data received and then take the necessary actions based on the received data.

4] Finally, the motor driver will receive the commands from the arduino and will provide necessary power for the motors to move the robot.

Bluetooth module¶

HC-05 module is an easy to use Bluetooth SPP (Serial Port Protocol) module, designed for transparent wireless serial connection setup.

More information abut bluetooth HC-05 module

MIT app inventor¶

App Inventor is a free, cloud-based service that can be accessed using a web browser. The apps made using the app inventor could be tested on the android phone using the companion app.

More about MIT app inventor

APP code 1¶

Arduino code 1¶

#include <SoftwareSerial.h>
SoftwareSerial bluetooth(3,4); // Rx of arduino=3 , Rx of arduino=4
char bt;



void setup() {
  // put your setup code here, to run once:
bluetooth.begin(9600); // Begins the communication between the bluetooth module and the arduino UNO with Baud rate 9600
Serial.begin(9600); // Begins the Serial Communication with the Baud rate 9600.
pinMode(10,OUTPUT); // Sets the Pins 10,11,12,13 as OUTPUT Pin.
pinMode(11,OUTPUT);
pinMode(12,OUTPUT);
pinMode(13,OUTPUT);

}

/* A function is a way for programmers to reuse code without having to rewrite the code.
 *  Syntax : returntype functionName ( arguments)
 *             // function body
 *             return eturntype;
 *             }
  */

  void moveRobot(String motion) {
    if( motion == "Forward")  {  // RW - FWD(10 - Pos, 11- Neg) ; LW-FWD( 12-Pos , 13-Neg)
    digitalWrite(10,HIGH);
    digitalWrite(11,LOW);
    digitalWrite(12,HIGH);
    digitalWrite(13,LOW);       
    Serial.println("Forward");
    }


    if( motion == "Backward") {  //RW - Bck(10 - Neg, 11- Pos) ; LW-FWD( 12-Neg , 13-Pos)
    digitalWrite(10,LOW);
    digitalWrite(11,HIGH);
    digitalWrite(12,LOW);
    digitalWrite(13,HIGH);       
    Serial.println("Backward");
    }

     if( motion == "Left") {  //RW - FWD(10 - Pos, 11- Neg) ; LW-FWD( 12-Neg , 13-Pos)
    digitalWrite(10,HIGH);
    digitalWrite(11,LOW);
    digitalWrite(12,LOW);
    digitalWrite(13,HIGH);       
    Serial.println("Left");
    }

    if( motion == "Right") {  //RW - FWD(10 - Neg, 11- Pos) ; LW-FWD( 12-Pos , 13-Neg)
    digitalWrite(10,LOW);
    digitalWrite(11,HIGH);
    digitalWrite(12,HIGH);
    digitalWrite(13,LOW);       
    Serial.println("Right");
    }

    if( motion == "Stop") {  //RW - FWD(10 - Neg, 11- Neg) ; LW-FWD( 12-Neg , 13-Neg)
    digitalWrite(10,LOW);
    digitalWrite(11,LOW);
    digitalWrite(12,LOW);
    digitalWrite(13,LOW);       
    Serial.println("Stop");
    }

  }


    void loop() {
  // put your main code here, to run repeatedly:

  if(bluetooth.available() ) { // Checks if bluetooth is available or not.
  bt = bluetooth.read() ; // Read the data from Bluetooth and store it in "bt".


 }

   Serial.println("The character sent from voice controller app is:" +String(bt));


  if(bt =='f'){               // The character sent by the app for forward condition is 'f'. Characters are represented in single quotes and string in double quotes.
    moveRobot("Forward");
  }

  if(bt =='b')
  {
    moveRobot("Backward");

  }
    if(bt =='l')
    {
    moveRobot("Left");

  }

   if(bt =='r')
   {
    moveRobot("Right");

  }

if(bt =='s')  
    {
    moveRobot("Stop");

  }

    }

APP code 2¶

Arduino code 2¶

#include<SoftwareSerial.h> // includes the software library
SoftwareSerial bluetooth(3,4);
 char bt;  // bt is just the variable name. Any name can be given to a charcter.
void setup() {
  // put your setup code here, to run once:
  bluetooth.begin(9600);
  Serial.begin(9600);
  Serial.println("Pair with bluetooth");
  pinMode(13,OUTPUT);
  pinMode(10,OUTPUT);
  pinMode(11,OUTPUT);
  pinMode(12,OUTPUT);
}
void moveRobot(String motion)
{
  if(motion=="Forward")
  {
    digitalWrite(10,HIGH);
    digitalWrite(11,LOW);
    digitalWrite(12,HIGH);
    digitalWrite(13,LOW);
    Serial.println("Forward");

  }



  if(motion=="Backward")
  {
    digitalWrite(10,LOW);
    digitalWrite(11,HIGH);
    digitalWrite(12,LOW);
    digitalWrite(13,HIGH);
        Serial.println("Backward");
  }


  if(motion=="Left")
  {
    digitalWrite(10,HIGH);
    digitalWrite(11,LOW);
    digitalWrite(12,LOW);
    digitalWrite(13,HIGH);
       Serial.println("Left");
  }



  if(motion=="Right")
  {
    digitalWrite(10,LOW);
    digitalWrite(11,HIGH);
    digitalWrite(12,HIGH);
    digitalWrite(13,LOW);
       Serial.println("Right");
  }



  if(motion=="Stop")
  {
    digitalWrite(10,LOW);
    digitalWrite(11,LOW);
    digitalWrite(12,LOW);
    digitalWrite(13,LOW);
        Serial.println("Stop");
  }
}
void loop() {
  // put your main code here, to run repeatedly:
String data=""; // can just be String data. Need not write String data =" "
 while(bluetooth.available())
  {

 bt=bluetooth.read();
    data+=bt; // data = data+bt . The word data is also a variavle name. Any name can be given instaed of data like voice , response etc . This adds new charcters to existing chacters thus forming a STRING

    Serial.println(String(data));
    if(data=="forward") // IN the voice app when we call out the directions, the word will be displayed in this manner.
    {
      moveRobot("Forward");

    }
    else if(data=="backward")
    {
      moveRobot("Backward");

    }
    else if(data=="right")
    {
      moveRobot("Right");

    }
    else if(data=="left")
    {
      moveRobot("Left");

    }
    else if(data=="stop")
    {
      moveRobot("Stop");

    }


    }

  }