Device Controlling Using Android

The purpose of this project is to demonstrate the basic principles of external device controlling using your android phone.

The basic principle in this project is that by interfacing an Android phone with a Arduino Board we can turn "off" or "on" some relays.

Components Required

•           Serial Port Bluetooth Module( TTL )
•           Arduino Microcontroller Board (ET-BASEAVR EASY328 ) Arduino Compatible Board
•           8 channel Output Relay Board

 Connection Diagrams

Source Code For Arduino Board

For Arduino Microcontroller Board Source code

#define LED_PIN1  4
#define LED_PIN2  5
#define LED_PIN3  6
#define LED_PIN4  7

#define LED_PIN5  8
#define LED_PIN6  9
#define LED_PIN7  10
#define LED_PIN8  11

int firstSensor = 0;         // first analog sensor
int secondSensor = 0;    // second analog sensor
int thirdSensor = 0;        // digital sensor
int inByte = 0;               // incoming serial byte
boolean status_unlock;
boolean status_bluetooth;

long interval = 1000;           // interval at which to blink (milliseconds)
long previousMillis = 0;        // will store last time LED was update
int minite,sec;


void setup()
{
  // start serial port at 9600 bps:
  Serial.begin(9600);
  //pinMode(2, INPUT);   // digital sensor is on digital pin 2
  //establishContact();    // send a byte to establish contact until receiver responds
 
  pinMode(LED_PIN1, OUTPUT);
  pinMode(LED_PIN2, OUTPUT);
  pinMode(LED_PIN3, OUTPUT);
  pinMode(LED_PIN4, OUTPUT);

  pinMode(LED_PIN5, OUTPUT);
  pinMode(LED_PIN6, OUTPUT);
  pinMode(LED_PIN7, OUTPUT);
  pinMode(LED_PIN8, OUTPUT);
 
  digitalWrite(LED_PIN1, LOW);  // switch off LED
  digitalWrite(LED_PIN2, LOW);  // switch off LED
  digitalWrite(LED_PIN3, LOW);  // switch off LED
  digitalWrite(LED_PIN4, LOW);  // switch off LED
   
  digitalWrite(LED_PIN5, LOW);  // switch off LED
  digitalWrite(LED_PIN6, LOW);  // switch off LED
  digitalWrite(LED_PIN7, LOW);  // switch off LED
  digitalWrite(LED_PIN8, LOW);  // switch off LED
 
  status_bluetooth = true;
  status_unlock = false;
  sec = 0;
}

void loop()
{
  if (Serial.available() > 0) {  
      
    inByte = Serial.read();                      // get incoming byte: 

    if(inByte == 'A'){   
      digitalWrite(LED_PIN1, HIGH);        // switch on LED
      Serial.print('A', BYTE);                    // send a char
      delay(800);
      digitalWrite(LED_PIN1, LOW);        // switch off LED
      status_unlock = false;
      inByte = 0;    
    }
   
    if(inByte == 'a'){   
      digitalWrite(LED_PIN2, HIGH);        // switch on LED
      Serial.print('a', BYTE);                    // send a char
      delay(800);
      digitalWrite(LED_PIN2, LOW);        // switch off LED
     
      status_unlock = true;
      sec = 0;
      inByte = 0;    
    }
   
    if(inByte == 'B'){   
      digitalWrite(LED_PIN3, HIGH);        // switch on LED
      Serial.print('B', BYTE);                    // send a char
      inByte = 0;    
    }
   
    if(inByte == 'b'){   
      digitalWrite(LED_PIN3, LOW);        // switch off LED
      Serial.print('b', BYTE);                   // send a char
      inByte = 0;    
    }
   
    if(inByte == 'C'){   
      digitalWrite(LED_PIN4, HIGH);        // switch on LED
      Serial.print('C', BYTE);                    // send a char
      inByte = 0;    
    }
   
    if(inByte == 'c'){   
      digitalWrite(LED_PIN4, LOW);        // switch off LED
      Serial.print('c', BYTE);                    // send a char
      inByte = 0;    
    }
   
    if(inByte == 'D'){   
      digitalWrite(LED_PIN5, HIGH);        // switch on LED
      Serial.print('D', BYTE);                    // send a char
      inByte = 0;    
    }
   
    if(inByte == 'd'){   
      digitalWrite(LED_PIN5, LOW);        // switch off LED
      Serial.print('d', BYTE);                   // send a char
      inByte = 0;    
    }
   
    if(inByte == 'E'){   
      digitalWrite(LED_PIN6, HIGH);        // switch on LED
      Serial.print('E', BYTE);                    // send a char
      inByte = 0;    
    }
   
    if(inByte == 'e'){   
      digitalWrite(LED_PIN6, LOW);        // switch off LED
      Serial.print('e', BYTE);                   // send a char
      inByte = 0;    
    }
   
    if(inByte == 'F'){   
      digitalWrite(LED_PIN7, HIGH);        // switch on LED
      Serial.print('F', BYTE);                    // send a char
      inByte = 0;    
    }
   
    if(inByte == 'f'){   
      digitalWrite(LED_PIN7, LOW);        // switch off LED
      Serial.print('f', BYTE);                    // send a char
      inByte = 0;    
    }
   
    if(inByte == 'G'){   
      digitalWrite(LED_PIN8, HIGH);        // switch on LED
      Serial.print('G', BYTE);                    // send a char
      inByte = 0;    
    }
   
    if(inByte == 'g'){   
      digitalWrite(LED_PIN8, LOW);        // switch off LED
      Serial.print('g', BYTE);                   // send a char
      inByte = 0;    
    }   
   
    if(inByte == 'S'){   
     
      Serial.print('S', BYTE);                  // send a char
      status_bluetooth = true;
      sec = 0;
         
    }   
  } // if(Serial
 
  /*
  unsigned long currentMillis = millis();
     
              if(currentMillis - previousMillis > interval) {           
                previousMillis = currentMillis;         // save the last time you blinked the LED
               
                sec++;
               
                if(status_unlock==true){
               
                  if(sec== 11){
               
                      digitalWrite(LED_PIN1, HIGH);        // switch on LED
               
                      delay(800);
                      digitalWrite(LED_PIN1, LOW);        // switch off LED
               
                      status_unlock = false;                 
                      sec = 0;
                  }
                }
                else sec = 0;               
               
              }
 
 */
   
} //Loop

void establishContact() {
  while (Serial.available() <= 0) {
    Serial.print('.', BYTE);                   // send a capital A
    delay(500);
  }
}

ANDROID BLUETOOTH CONTROLLED DEVICE

 Android Bluetooth control application helps to control up to 8 external electrical or electronic devices. Use Android Bluetooth mobile device to  remote control your device with Bluetooth Receiver hardware Device.

Main features of the program

• It can control  up to  8 devices.
  These devices can be turned off /on by setting Timer to ON / OFF the device and show the time.(the timer can be set to 1 minute, 15 minutes, 30 minutes, 1 hour, 2 hours, 4 hours).
  Use with Receiving device (Bluetooth Receiver Hardware Device see below).
• Design for the Android version 4 and a screen resolution of 480 x 800 (WVGA).
• Freeware with AD (free software)