Bluetooth Project : Voice Controlled Led

1/*CONTROLLING A LED WITH ARDUINO AND BLUETOOTH MODULE [HC-05]
2  THIS  CODE DEMONSTRATES CONTROLLING A LED WITH VOICE COMMANDS [GIVEN FROM A MOBILE PHONE].
3  
4  >> CONNECTIONS [LED TO ARDUINO]:
5     |------------|-----------|
6     |    LED     |  ARDUINO  |
7     |------------+-----------|
8     |1)POSITIVE  | PIN 13    |
9     |------------+-----------|
10     |2)NEGATIVE  | GND       |
11     |------------|-----------|
12
13  >> CONNECTIONS [HC-05 TO ARDUINO]:
14     |------------|-----------|
15     |   HC-05    |  ARDUINO  |
16     |------------+-----------|
17     |1)POSITIVE  | +5V       |
18     |------------+-----------|
19     |2)NEGATIVE  | GND       |
20     |------------+-----------|
21     |3)RX        | TX        |
22     |------------+-----------|
23     |4)TX        | RX        |
24     |------------|-----------|
25
26  NOTE-IT IS ADVISED THAT BLUETOOTH MODULE SHOULD BE ATTACHED TO ARDUINO BOARD AFTER
27       UPLOADING CODE TO AVOID ERRORS AND PREVENT POSSIBLE DAMAGE TO BLUETOOTH MODULE.
28
29  CODE CREATED BY - AMEYA ANGADI
30  LAST MODIFIED ON - 24/7/2021
31  
32*/
33
34char  input;                    //VARIABLE TO STORE INPUT.
35int led1 = 13;                 //DECLARING  "led1" PIN FOR A LED.
36
37void setup() {
38  Serial.begin(9600);          //STARTS  SERIAL MONITOR AT 9600 BAUD RATE.
39  pinMode(led1, OUTPUT);       //DEFINING "led1"  AS A OUTPUT.
40}
41
42void loop() {
43  if ( Serial.available())
44  {
45    input = Serial.read();     //READS THE DATA AND STORES IT AS A VARIABLE.
46    Serial.println(input);     //PRINTS THE INPUT.
47  }
48
49  if (input ==  'X')            //CHECKS WHETER THE RECIEVED VALUE IS EQUAL TO 'X'.
50    digitalWrite(led1,  HIGH);  //IF VALUE IS EQUAL TO 'X' THEN ARDUINO BOARD SETS "led1" TO HIGH.
51  else if (input == 'Y')       //CHECKS WHETER THE RECIEVED VALUE IS EQUAL TO 'Y'.
52    digitalWrite(led1, LOW);   //IF VALUE IS EQUAL TO 'Y' THEN ARDUINO BOARD SETS  "led1" TO LOW.
53
54  delay(100);
55}
56