Turn LED ON/ OFF In Bluetooth Using Android Apps In Arduino Mega 2560

Sr Karthiga

6y18.7k18100Article

18 Comments

Join the conversation! Your thoughts help the community grow.

Sr Karthiga10y ago
thank you asfend sir
Asfend Yar10y ago
good
Sr Karthiga10y ago
Thank you vignesh mani sir
Vignesh Mani10y ago
Nice
Sr Karthiga10y ago
Thank you santhakumar sir
Santhakumar Munuswamy10y ago
Thanks for nice share
Sr Karthiga10y ago
Thank you sir
Sibeesh Venu10y ago
Nice Share
Sr Karthiga10y ago
Thank you Mohammed sir
Mohammed Ibrahim10y ago
nice
Sr Karthiga10y ago
Thank you gowtham sir
Gowtham K10y ago
Good One
Sr Karthiga10y ago
Thank you raja sir
Raja T10y ago
Nice, Thanks for sharing
Sr Karthiga10y ago
Thank you shubham sir
Shubham Kumar10y ago
Nice one
Sr Karthiga10y ago
Thank you kumaresh sir
Kumaresh Rajalingam10y ago
Good one

Introduction

In this article, I will explain how to turn LED ON/ OFF in Bluetooth using Android Apps In Arduino Mega 2560. In the setup, we can easily connect it through an Android app. LED turns on when the ON button is pressed, and off when the Off button is pressed.

Parts of list

Arduino Mega2 560
Bluetooth (HC05)
Breadboard
Hookup wires

Software required

MIT App Inventor 2

Connection:

Step 1: Connection from the Bluetooth (HC05) to the Arduino Mega 2560.

Figure1: Bluetooth(HC05)

In the Bluetooth the Vcc can be connected to the 5v supply of the Arduino Mega board.
In the Bluetooth the Gnd can be connected to the Gnd supply of the Arduino Mega board.
In the Bluetooth the Tx can be connected to the Rx of the Arduino Mega board.
In the Bluetooth the Rx can be connected to the Tx of the Arduino Mega board.

Step2: Connection from the LED to the Arduino Mega2560.

The positive pin of the LED can be connected to the digital pin 13 to the Arduino Mega board.
The negative pin of the led can be connected to the Gnd to the Arduino Mega board.

Software steps:

Open the MIT App Inventor
Click Start, then a new project
Design the Bluetooth connection in the app inventor.
Click the toolbar and add the buttons and set the device of the Bluetooth.
In the program set the code and click the connect, than Al companion.
Scan the code and see the output on the board.

MIT App Window

MIT App window

Programming

int led - turn - on - off - in -bluetooth - using - android - apps - in -arduinompin = 13;
String readString;
void setup()
{
Serial.begin(9600); // Baud Rate
pinMode(led - turn - on - off - in -bluetooth - using - android - apps - in -arduinompin, OUTPUT);
}
void loop()
{
while (Serial.available()) //Send data only when you receive data
{
delay(4); //delay time
char c = Serial.read();
readString += c;
}
if (readString.length() > 0)
{
Serial.println(readString);
if (readString == "ON")
{
digitalWrite(led - turn - on - off - in -bluetooth - using - android - apps - in -arduinompin, HIGH); // LED ON
}
if (readString == "OFF")
{
digitalWrite(led - turn - on - off - in -bluetooth - using - android - apps - in -arduinompin, LOW); //LED OFF
}
readString = "";
}
}

Explanation

In this article it can work through the Android and Bluetooth set up.
The LED turns on clicking the ON button.
The LED turns off clicking the OFF button.
In another case, we can see the LED on/off in the serial monitor also.

Output

Figure 3: Output

Read articles on Arduino: