Voice Controlled LED's using Arduino and Bluetooth

Controlling LEDs with voice command seems to be a difficult task, but it’s easy and you can quickly build it.

Nov 29, 2021

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voice control

led

mobile apps

Components and supplies

Breadboard (generic)

Jumper wires (generic)

5 mm LED: Green

Resistor 220 ohm

HC-05 Bluetooth Module

Arduino UNO

5 mm LED: Red

Project description

Code

c_cpp

The project code

1#include <SoftwareSerial.h>
2String value;
3int TxD = 11;
4int RxD   = 10;
5int servoposition;
6SoftwareSerial bluetooth(TxD, RxD);
7
8void setup()   {
9  pinMode(2, OUTPUT);
10  pinMode(3, OUTPUT);
11  Serial.begin(9600);       //   start serial communication at 9600bps
12  bluetooth.begin(9600);
13}
14
15void   loop() {
16  Serial.println(value);
17 if (bluetooth.available())
18   {
19     value = bluetooth.readString();
20
21    if (value == "all LED turn on"){
22     digitalWrite(2, HIGH);
23    digitalWrite(3, HIGH);  
24      }
25
26    if   (value == "all LED turn off"){
27      digitalWrite(2, LOW); 
28      digitalWrite(3,   LOW);       
29      }
30
31    if (value == "turn on Red LED"){
32    digitalWrite(2,   HIGH); 
33      }
34
35    if (value == "turn on green LED"){
36      digitalWrite(3,   HIGH);       
37      }
38      
39    if (value == "turn off red LED"){
40     digitalWrite(2, LOW); 
41      }
42
43    if (value == "turn off green LED"){
44       digitalWrite(3, LOW);       
45      }
46
47 }
48
49}
50

#include <SoftwareSerial.h>
String value;
int TxD = 11;
int RxD   = 10;
int servoposition;
SoftwareSerial bluetooth(TxD, RxD);

void setup()   {
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  Serial.begin(9600);       //   start serial communication at 9600bps
  bluetooth.begin(9600);
}

void   loop() {
  Serial.println(value);
 if (bluetooth.available())
   {
     value = bluetooth.readString();

    if (value == "all LED turn on"){
     digitalWrite(2, HIGH);
    digitalWrite(3, HIGH);  
      }

    if   (value == "all LED turn off"){
      digitalWrite(2, LOW); 
      digitalWrite(3,   LOW);       
      }

    if (value == "turn on Red LED"){
    digitalWrite(2,   HIGH); 
      }

    if (value == "turn on green LED"){
      digitalWrite(3,   HIGH);       
      }
      
    if (value == "turn off red LED"){
     digitalWrite(2, LOW); 
      }

    if (value == "turn off green LED"){
       digitalWrite(3, LOW);       
      }

 }

}

Code

c_cpp

The project code

1#include <SoftwareSerial.h>
2String value;
3int TxD = 11;
4int RxD  = 10;
5int servoposition;
6SoftwareSerial bluetooth(TxD, RxD);
7
8void setup()  {
9  pinMode(2, OUTPUT);
10  pinMode(3, OUTPUT);
11  Serial.begin(9600);       //  start serial communication at 9600bps
12  bluetooth.begin(9600);
13}
14
15void  loop() {
16  Serial.println(value);
17 if (bluetooth.available())
18   {
19    value = bluetooth.readString();
20
21    if (value == "all LED turn on"){
22    digitalWrite(2, HIGH);
23    digitalWrite(3, HIGH);  
24      }
25
26    if  (value == "all LED turn off"){
27      digitalWrite(2, LOW); 
28      digitalWrite(3,  LOW);       
29      }
30
31    if (value == "turn on Red LED"){
32    digitalWrite(2,  HIGH); 
33      }
34
35    if (value == "turn on green LED"){
36      digitalWrite(3,  HIGH);       
37      }
38      
39    if (value == "turn off red LED"){
40    digitalWrite(2, LOW); 
41      }
42
43    if (value == "turn off green LED"){
44      digitalWrite(3, LOW);       
45      }
46
47 }
48
49}
50

#include <SoftwareSerial.h>
String value;
int TxD = 11;
int RxD  = 10;
int servoposition;
SoftwareSerial bluetooth(TxD, RxD);

void setup()  {
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  Serial.begin(9600);       //  start serial communication at 9600bps
  bluetooth.begin(9600);
}

void  loop() {
  Serial.println(value);
 if (bluetooth.available())
   {
    value = bluetooth.readString();

    if (value == "all LED turn on"){
    digitalWrite(2, HIGH);
    digitalWrite(3, HIGH);  
      }

    if  (value == "all LED turn off"){
      digitalWrite(2, LOW); 
      digitalWrite(3,  LOW);       
      }

    if (value == "turn on Red LED"){
    digitalWrite(2,  HIGH); 
      }

    if (value == "turn on green LED"){
      digitalWrite(3,  HIGH);       
      }
      
    if (value == "turn off red LED"){
    digitalWrite(2, LOW); 
      }

    if (value == "turn off green LED"){
      digitalWrite(3, LOW);       
      }

 }

}

Downloadable files

Schematic design

The project circuit diagram

Schematic design

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