Interfacing Grove Speech Recognizer with Arduino

A quick tutorial on how to interface the voice recognition module with few examples.

Mar 1, 2019

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home automation

voice

remote control

Components and supplies

Grove Speech Recognizer

Arduino UNO

Project description

Code

Lights + Random LEDs

arduino

Just a random LED sequence and Light voice controlled to know the module

1//A code to test with Grove Speech Recognizer
2//it turns on and off  lights (LEDs) on pin 7 and the (Mode 1/2) commands the 
3//other LEDs 
4
5#include  <SoftwareSerial.h>
6
7#define SOFTSERIAL_RX_PIN  2
8#define SOFTSERIAL_TX_PIN  3
9
10#define RED 8
11#define YEL 9
12#define GRE 10
13#define LIGHT 7
14
15short  m=0;
16
17SoftwareSerial softSerial(SOFTSERIAL_RX_PIN,SOFTSERIAL_TX_PIN);
18
19const  char *voiceBuffer[] = //Vocie commands you can keep this list to 
20{                           //know  your commands or remove it
21    "Turn on the light",
22    "Turn off the light",
23    "Play music",
24    "Pause",
25    "Next",
26    "Previous",
27    "Up",
28    "Down",
29    "Turn on the TV",
30    "Turn off the TV",
31    "Increase temperature",
32    "Decrease temperature",
33    "What's the  time",
34    "Open the door",
35    "Close the door",
36    "Left",
37    "Right",
38    "Stop",
39    "Start",
40    "Mode 1",
41    "Mode  2",
42    "Go",
43};
44
45void setup()
46{
47  Serial.begin(9600);
48  softSerial.begin(9600);
49  softSerial.listen();
50  pinMode(RED,OUTPUT);
51  pinMode(YEL,OUTPUT);
52  pinMode(GRE,OUTPUT);
53  pinMode(LIGHT,OUTPUT);
54}
55
56void  loop()
57{
58    int cmd;
59    if(softSerial.available())        //If something  is received
60    {
61        cmd = softSerial.read();     //The number of the  command is stored
62        Serial.println(voiceBuffer[cmd - 1]); //Shows the command  name
63    }
64    if(cmd==1)                 //To turn on the lights by its command
65    digitalWrite(LIGHT,HIGH);  //Turn on the lights which have "1" as number
66    
67    if(cmd==2)                //Turn them Off
68    digitalWrite(LIGHT,LOW);
69    
70    if(cmd==20)              //Mode 1 will execut once
71    Mode1();
72    
73    if(cmd==18){              //Turn off mode 2 by "Stop"
74    m=0;
75    digitalWrite(RED,LOW);
76    digitalWrite(YEL,LOW);
77    digitalWrite(GRE,LOW);
78    }
79    if(cmd==21)
80    m=1;
81
82    if(m==1)                 //Turn  on mode2 and keep it as long m=1
83    Mode2();       
84    
85}
86
87
88void  Mode1(){                   //Random LED sequence
89  digitalWrite(RED,HIGH);
90  digitalWrite(YEL,HIGH);
91  digitalWrite(GRE,HIGH);
92  delay(1000);
93  digitalWrite(RED,LOW);
94  delay(1000);
95  digitalWrite(YEL,LOW);
96  delay(1000);
97  digitalWrite(GRE,LOW);
98  delay(1000);
99  digitalWrite(RED,HIGH);
100  delay(1000);
101  digitalWrite(YEL,HIGH);
102  delay(1000);
103  digitalWrite(GRE,HIGH);
104  delay(2000);
105  digitalWrite(RED,LOW);
106  digitalWrite(YEL,LOW);
107  digitalWrite(GRE,LOW);
108}
109
110void Mode2(){  
111  digitalWrite(RED,HIGH);
112  digitalWrite(YEL,HIGH);
113  digitalWrite(GRE,HIGH);
114  delay(1000);
115  digitalWrite(RED,LOW);
116  digitalWrite(YEL,LOW);
117  digitalWrite(GRE,LOW);
118  delay(700);
119  digitalWrite(RED,HIGH);
120  digitalWrite(YEL,LOW);
121  digitalWrite(GRE,HIGH);
122  delay(500);
123  digitalWrite(RED,HIGH);
124  digitalWrite(YEL,LOW);
125  digitalWrite(GRE,LOW);
126  delay(300);
127}

//A code to test with Grove Speech Recognizer
//it turns on and off  lights (LEDs) on pin 7 and the (Mode 1/2) commands the 
//other LEDs 

#include  <SoftwareSerial.h>

#define SOFTSERIAL_RX_PIN  2
#define SOFTSERIAL_TX_PIN  3

#define RED 8
#define YEL 9
#define GRE 10
#define LIGHT 7

short  m=0;

SoftwareSerial softSerial(SOFTSERIAL_RX_PIN,SOFTSERIAL_TX_PIN);

const  char *voiceBuffer[] = //Vocie commands you can keep this list to 
{                           //know  your commands or remove it
    "Turn on the light",
    "Turn off the light",
    "Play music",
    "Pause",
    "Next",
    "Previous",
    "Up",
    "Down",
    "Turn on the TV",
    "Turn off the TV",
    "Increase temperature",
    "Decrease temperature",
    "What's the  time",
    "Open the door",
    "Close the door",
    "Left",
    "Right",
    "Stop",
    "Start",
    "Mode 1",
    "Mode  2",
    "Go",
};

void setup()
{
  Serial.begin(9600);
  softSerial.begin(9600);
  softSerial.listen();
  pinMode(RED,OUTPUT);
  pinMode(YEL,OUTPUT);
  pinMode(GRE,OUTPUT);
  pinMode(LIGHT,OUTPUT);
}

void  loop()
{
    int cmd;
    if(softSerial.available())        //If something  is received
    {
        cmd = softSerial.read();     //The number of the  command is stored
        Serial.println(voiceBuffer[cmd - 1]); //Shows the command  name
    }
    if(cmd==1)                 //To turn on the lights by its command
    digitalWrite(LIGHT,HIGH);  //Turn on the lights which have "1" as number
    
    if(cmd==2)                //Turn them Off
    digitalWrite(LIGHT,LOW);
    
    if(cmd==20)              //Mode 1 will execut once
    Mode1();
    
    if(cmd==18){              //Turn off mode 2 by "Stop"
    m=0;
    digitalWrite(RED,LOW);
    digitalWrite(YEL,LOW);
    digitalWrite(GRE,LOW);
    }
    if(cmd==21)
    m=1;

    if(m==1)                 //Turn  on mode2 and keep it as long m=1
    Mode2();       
    
}


void  Mode1(){                   //Random LED sequence
  digitalWrite(RED,HIGH);
  digitalWrite(YEL,HIGH);
  digitalWrite(GRE,HIGH);
  delay(1000);
  digitalWrite(RED,LOW);
  delay(1000);
  digitalWrite(YEL,LOW);
  delay(1000);
  digitalWrite(GRE,LOW);
  delay(1000);
  digitalWrite(RED,HIGH);
  delay(1000);
  digitalWrite(YEL,HIGH);
  delay(1000);
  digitalWrite(GRE,HIGH);
  delay(2000);
  digitalWrite(RED,LOW);
  digitalWrite(YEL,LOW);
  digitalWrite(GRE,LOW);
}

void Mode2(){  
  digitalWrite(RED,HIGH);
  digitalWrite(YEL,HIGH);
  digitalWrite(GRE,HIGH);
  delay(1000);
  digitalWrite(RED,LOW);
  digitalWrite(YEL,LOW);
  digitalWrite(GRE,LOW);
  delay(700);
  digitalWrite(RED,HIGH);
  digitalWrite(YEL,LOW);
  digitalWrite(GRE,HIGH);
  delay(500);
  digitalWrite(RED,HIGH);
  digitalWrite(YEL,LOW);
  digitalWrite(GRE,LOW);
  delay(300);
}

Lights + Random LEDs

arduino

Just a random LED sequence and Light voice controlled to know the module

1//A code to test with Grove Speech Recognizer
2//it turns on and off   lights (LEDs) on pin 7 and the (Mode 1/2) commands the 
3//other LEDs 
4
5#include   <SoftwareSerial.h>
6
7#define SOFTSERIAL_RX_PIN  2
8#define SOFTSERIAL_TX_PIN   3
9
10#define RED 8
11#define YEL 9
12#define GRE 10
13#define LIGHT 7
14
15short   m=0;
16
17SoftwareSerial softSerial(SOFTSERIAL_RX_PIN,SOFTSERIAL_TX_PIN);
18
19const   char *voiceBuffer[] = //Vocie commands you can keep this list to 
20{                           //know   your commands or remove it
21    "Turn on the light",
22    "Turn off the light",
23     "Play music",
24    "Pause",
25    "Next",
26    "Previous",
27     "Up",
28    "Down",
29    "Turn on the TV",
30    "Turn off the TV",
31     "Increase temperature",
32    "Decrease temperature",
33    "What's the   time",
34    "Open the door",
35    "Close the door",
36    "Left",
37     "Right",
38    "Stop",
39    "Start",
40    "Mode 1",
41    "Mode   2",
42    "Go",
43};
44
45void setup()
46{
47  Serial.begin(9600);
48   softSerial.begin(9600);
49  softSerial.listen();
50  pinMode(RED,OUTPUT);
51   pinMode(YEL,OUTPUT);
52  pinMode(GRE,OUTPUT);
53  pinMode(LIGHT,OUTPUT);
54}
55
56void   loop()
57{
58    int cmd;
59    if(softSerial.available())        //If something   is received
60    {
61        cmd = softSerial.read();     //The number of the   command is stored
62        Serial.println(voiceBuffer[cmd - 1]); //Shows the command   name
63    }
64    if(cmd==1)                 //To turn on the lights by its command
65     digitalWrite(LIGHT,HIGH);  //Turn on the lights which have "1" as number
66     
67    if(cmd==2)                //Turn them Off
68    digitalWrite(LIGHT,LOW);
69     
70    if(cmd==20)              //Mode 1 will execut once
71    Mode1();
72     
73    if(cmd==18){              //Turn off mode 2 by "Stop"
74    m=0;
75     digitalWrite(RED,LOW);
76    digitalWrite(YEL,LOW);
77    digitalWrite(GRE,LOW);
78     }
79    if(cmd==21)
80    m=1;
81
82    if(m==1)                 //Turn   on mode2 and keep it as long m=1
83    Mode2();       
84    
85}
86
87
88void   Mode1(){                   //Random LED sequence
89  digitalWrite(RED,HIGH);
90   digitalWrite(YEL,HIGH);
91  digitalWrite(GRE,HIGH);
92  delay(1000);
93  digitalWrite(RED,LOW);
94   delay(1000);
95  digitalWrite(YEL,LOW);
96  delay(1000);
97  digitalWrite(GRE,LOW);
98   delay(1000);
99  digitalWrite(RED,HIGH);
100  delay(1000);
101  digitalWrite(YEL,HIGH);
102   delay(1000);
103  digitalWrite(GRE,HIGH);
104  delay(2000);
105  digitalWrite(RED,LOW);
106   digitalWrite(YEL,LOW);
107  digitalWrite(GRE,LOW);
108}
109
110void Mode2(){  
111   digitalWrite(RED,HIGH);
112  digitalWrite(YEL,HIGH);
113  digitalWrite(GRE,HIGH);
114   delay(1000);
115  digitalWrite(RED,LOW);
116  digitalWrite(YEL,LOW);
117  digitalWrite(GRE,LOW);
118   delay(700);
119  digitalWrite(RED,HIGH);
120  digitalWrite(YEL,LOW);
121  digitalWrite(GRE,HIGH);
122   delay(500);
123  digitalWrite(RED,HIGH);
124  digitalWrite(YEL,LOW);
125  digitalWrite(GRE,LOW);
126   delay(300);
127}

//A code to test with Grove Speech Recognizer
//it turns on and off   lights (LEDs) on pin 7 and the (Mode 1/2) commands the 
//other LEDs 

#include   <SoftwareSerial.h>

#define SOFTSERIAL_RX_PIN  2
#define SOFTSERIAL_TX_PIN   3

#define RED 8
#define YEL 9
#define GRE 10
#define LIGHT 7

short   m=0;

SoftwareSerial softSerial(SOFTSERIAL_RX_PIN,SOFTSERIAL_TX_PIN);

const   char *voiceBuffer[] = //Vocie commands you can keep this list to 
{                           //know   your commands or remove it
    "Turn on the light",
    "Turn off the light",
     "Play music",
    "Pause",
    "Next",
    "Previous",
     "Up",
    "Down",
    "Turn on the TV",
    "Turn off the TV",
     "Increase temperature",
    "Decrease temperature",
    "What's the   time",
    "Open the door",
    "Close the door",
    "Left",
     "Right",
    "Stop",
    "Start",
    "Mode 1",
    "Mode   2",
    "Go",
};

void setup()
{
  Serial.begin(9600);
   softSerial.begin(9600);
  softSerial.listen();
  pinMode(RED,OUTPUT);
   pinMode(YEL,OUTPUT);
  pinMode(GRE,OUTPUT);
  pinMode(LIGHT,OUTPUT);
}

void   loop()
{
    int cmd;
    if(softSerial.available())        //If something   is received
    {
        cmd = softSerial.read();     //The number of the   command is stored
        Serial.println(voiceBuffer[cmd - 1]); //Shows the command   name
    }
    if(cmd==1)                 //To turn on the lights by its command
     digitalWrite(LIGHT,HIGH);  //Turn on the lights which have "1" as number
     
    if(cmd==2)                //Turn them Off
    digitalWrite(LIGHT,LOW);
     
    if(cmd==20)              //Mode 1 will execut once
    Mode1();
     
    if(cmd==18){              //Turn off mode 2 by "Stop"
    m=0;
     digitalWrite(RED,LOW);
    digitalWrite(YEL,LOW);
    digitalWrite(GRE,LOW);
     }
    if(cmd==21)
    m=1;

    if(m==1)                 //Turn   on mode2 and keep it as long m=1
    Mode2();       
    
}


void   Mode1(){                   //Random LED sequence
  digitalWrite(RED,HIGH);
   digitalWrite(YEL,HIGH);
  digitalWrite(GRE,HIGH);
  delay(1000);
  digitalWrite(RED,LOW);
   delay(1000);
  digitalWrite(YEL,LOW);
  delay(1000);
  digitalWrite(GRE,LOW);
   delay(1000);
  digitalWrite(RED,HIGH);
  delay(1000);
  digitalWrite(YEL,HIGH);
   delay(1000);
  digitalWrite(GRE,HIGH);
  delay(2000);
  digitalWrite(RED,LOW);
   digitalWrite(YEL,LOW);
  digitalWrite(GRE,LOW);
}

void Mode2(){  
   digitalWrite(RED,HIGH);
  digitalWrite(YEL,HIGH);
  digitalWrite(GRE,HIGH);
   delay(1000);
  digitalWrite(RED,LOW);
  digitalWrite(YEL,LOW);
  digitalWrite(GRE,LOW);
   delay(700);
  digitalWrite(RED,HIGH);
  digitalWrite(YEL,LOW);
  digitalWrite(GRE,HIGH);
   delay(500);
  digitalWrite(RED,HIGH);
  digitalWrite(YEL,LOW);
  digitalWrite(GRE,LOW);
   delay(300);
}

2WD Robot code

arduino

You can use this code to control a robot to advance, turn or stop, here the forward stops automatically after 2s you can remove it and stop it by "Stop" command

1//This code is to use with Grove Speech recognizer and 2WD robot with
2//l298n  DC motor driver
3
4#include <SoftwareSerial.h>
5
6#define SOFTSERIAL_RX_PIN  2
7#define SOFTSERIAL_TX_PIN  3
8
9SoftwareSerial softSerial(SOFTSERIAL_RX_PIN,SOFTSERIAL_TX_PIN);
10
11int  in1 = 8;   //L298n pins and here I didn't add the speed control
12int in2 = 9;
13int  in3 = 10;
14int in4 = 11;
15
16void setup() {
17  
18 pinMode(in1, OUTPUT);
19  pinMode(in2, OUTPUT);
20 pinMode(in3, OUTPUT);
21 pinMode(in4, OUTPUT);
22
23  softSerial.begin(9600);
24 softSerial.listen();
25}
26
27void loop() {
28    int  cmd;
29    if(softSerial.available())
30    {
31        cmd = softSerial.read();
32   
33    }
34    
35    if(cmd==19){   //I removed the command list here I used  "Start"
36    Forward();    //Left Right and Stop and cmd==their number
37    delay(2000);  //I added a delay to stop it you can remove it and use a
38    Stop();     //voice  command to stop it
39    }
40
41    if(cmd==17){
42    Right();
43    delay(500);
44    Stop();
45    }
46
47    if(cmd==16){
48    Left();
49    delay(500);
50    Stop();
51    }
52       
53    if(cmd==18)
54    Stop();
55
56}
57
58//Classic  L298n Driver functions
59void Forward(){
60  digitalWrite(in1, LOW); 
61  digitalWrite(in2,  HIGH);
62  digitalWrite(in3, HIGH);
63  digitalWrite(in4, LOW);  
64}
65
66
67void  Left(){
68  digitalWrite(in1, LOW); 
69  digitalWrite(in2, HIGH);
70  digitalWrite(in3,  LOW);
71  digitalWrite(in4, LOW);  
72}
73
74void Right(){
75  digitalWrite(in1,  LOW); 
76  digitalWrite(in2, LOW);
77  digitalWrite(in3, HIGH);
78  digitalWrite(in4,  LOW);  
79}
80
81void Stop(){
82  digitalWrite(in1, LOW); 
83  digitalWrite(in2,  LOW);
84  digitalWrite(in3, LOW);
85  digitalWrite(in4, LOW);  
86}

//This code is to use with Grove Speech recognizer and 2WD robot with
//l298n  DC motor driver

#include <SoftwareSerial.h>

#define SOFTSERIAL_RX_PIN  2
#define SOFTSERIAL_TX_PIN  3

SoftwareSerial softSerial(SOFTSERIAL_RX_PIN,SOFTSERIAL_TX_PIN);

int  in1 = 8;   //L298n pins and here I didn't add the speed control
int in2 = 9;
int  in3 = 10;
int in4 = 11;

void setup() {
  
 pinMode(in1, OUTPUT);
  pinMode(in2, OUTPUT);
 pinMode(in3, OUTPUT);
 pinMode(in4, OUTPUT);

  softSerial.begin(9600);
 softSerial.listen();
}

void loop() {
    int  cmd;
    if(softSerial.available())
    {
        cmd = softSerial.read();
   
    }
    
    if(cmd==19){   //I removed the command list here I used  "Start"
    Forward();    //Left Right and Stop and cmd==their number
    delay(2000);  //I added a delay to stop it you can remove it and use a
    Stop();     //voice  command to stop it
    }

    if(cmd==17){
    Right();
    delay(500);
    Stop();
    }

    if(cmd==16){
    Left();
    delay(500);
    Stop();
    }
       
    if(cmd==18)
    Stop();

}

//Classic  L298n Driver functions
void Forward(){
  digitalWrite(in1, LOW); 
  digitalWrite(in2,  HIGH);
  digitalWrite(in3, HIGH);
  digitalWrite(in4, LOW);  
}


void  Left(){
  digitalWrite(in1, LOW); 
  digitalWrite(in2, HIGH);
  digitalWrite(in3,  LOW);
  digitalWrite(in4, LOW);  
}

void Right(){
  digitalWrite(in1,  LOW); 
  digitalWrite(in2, LOW);
  digitalWrite(in3, HIGH);
  digitalWrite(in4,  LOW);  
}

void Stop(){
  digitalWrite(in1, LOW); 
  digitalWrite(in2,  LOW);
  digitalWrite(in3, LOW);
  digitalWrite(in4, LOW);  
}

Basic code

arduino

Simple code to test your module and it shows the command on the Serial Monitor

1//Code from http://wiki.seeedstudio.com/Grove-Speech_Recognizer/
2
3#include  <SoftwareSerial.h>
4
5#define SOFTSERIAL_RX_PIN  2
6#define SOFTSERIAL_TX_PIN  3
7
8SoftwareSerial softSerial(SOFTSERIAL_RX_PIN,SOFTSERIAL_TX_PIN);
9
10const  char *voiceBuffer[] =
11{
12    "Turn on the light",
13    "Turn off the light",
14    "Play music",
15    "Pause",
16    "Next",
17    "Previous",
18    "Up",
19    "Down",
20    "Turn on the TV",
21    "Turn off the TV",
22    "Increase temperature",
23    "Decrease temperature",
24    "What's the  time",
25    "Open the door",
26    "Close the door",
27    "Left",
28    "Right",
29    "Stop",
30    "Start",
31    "Mode 1",
32    "Mode  2",
33    "Go",
34};
35
36void setup()
37{
38    Serial.begin(9600);
39    softSerial.begin(9600);
40    softSerial.listen();
41}
42
43void loop()
44{
45    char cmd;
46
47    if(softSerial.available())
48    {
49        cmd = softSerial.read();
50        Serial.println(voiceBuffer[cmd - 1]);
51    }
52}

//Code from http://wiki.seeedstudio.com/Grove-Speech_Recognizer/

#include  <SoftwareSerial.h>

#define SOFTSERIAL_RX_PIN  2
#define SOFTSERIAL_TX_PIN  3

SoftwareSerial softSerial(SOFTSERIAL_RX_PIN,SOFTSERIAL_TX_PIN);

const  char *voiceBuffer[] =
{
    "Turn on the light",
    "Turn off the light",
    "Play music",
    "Pause",
    "Next",
    "Previous",
    "Up",
    "Down",
    "Turn on the TV",
    "Turn off the TV",
    "Increase temperature",
    "Decrease temperature",
    "What's the  time",
    "Open the door",
    "Close the door",
    "Left",
    "Right",
    "Stop",
    "Start",
    "Mode 1",
    "Mode  2",
    "Go",
};

void setup()
{
    Serial.begin(9600);
    softSerial.begin(9600);
    softSerial.listen();
}

void loop()
{
    char cmd;

    if(softSerial.available())
    {
        cmd = softSerial.read();
        Serial.println(voiceBuffer[cmd - 1]);
    }
}

2WD Robot code

arduino

You can use this code to control a robot to advance, turn or stop, here the forward stops automatically after 2s you can remove it and stop it by "Stop" command

1//This code is to use with Grove Speech recognizer and 2WD robot with
2//l298n
3  DC motor driver
4
5#include <SoftwareSerial.h>
6
7#define SOFTSERIAL_RX_PIN
8  2
9#define SOFTSERIAL_TX_PIN  3
10
11SoftwareSerial softSerial(SOFTSERIAL_RX_PIN,SOFTSERIAL_TX_PIN);
12
13int
14  in1 = 8;   //L298n pins and here I didn't add the speed control
15int in2 = 9;
16int
17  in3 = 10;
18int in4 = 11;
19
20void setup() {
21  
22 pinMode(in1, OUTPUT);
23
24  pinMode(in2, OUTPUT);
25 pinMode(in3, OUTPUT);
26 pinMode(in4, OUTPUT);
27
28
29  softSerial.begin(9600);
30 softSerial.listen();
31}
32
33void loop() {
34    int
35  cmd;
36    if(softSerial.available())
37    {
38        cmd = softSerial.read();
39
40   
41    }
42    
43    if(cmd==19){   //I removed the command list here I used
44  "Start"
45    Forward();    //Left Right and Stop and cmd==their number
46    delay(2000);
47  //I added a delay to stop it you can remove it and use a
48    Stop();     //voice
49  command to stop it
50    }
51
52    if(cmd==17){
53    Right();
54    delay(500);
55
56    Stop();
57    }
58
59    if(cmd==16){
60    Left();
61    delay(500);
62
63    Stop();
64    }
65       
66    if(cmd==18)
67    Stop();
68
69}
70
71//Classic
72  L298n Driver functions
73void Forward(){
74  digitalWrite(in1, LOW); 
75  digitalWrite(in2,
76  HIGH);
77  digitalWrite(in3, HIGH);
78  digitalWrite(in4, LOW);  
79}
80
81
82void
83  Left(){
84  digitalWrite(in1, LOW); 
85  digitalWrite(in2, HIGH);
86  digitalWrite(in3,
87  LOW);
88  digitalWrite(in4, LOW);  
89}
90
91void Right(){
92  digitalWrite(in1,
93  LOW); 
94  digitalWrite(in2, LOW);
95  digitalWrite(in3, HIGH);
96  digitalWrite(in4,
97  LOW);  
98}
99
100void Stop(){
101  digitalWrite(in1, LOW); 
102  digitalWrite(in2,
103  LOW);
104  digitalWrite(in3, LOW);
105  digitalWrite(in4, LOW);  
106}

//This code is to use with Grove Speech recognizer and 2WD robot with
//l298n
  DC motor driver

#include <SoftwareSerial.h>

#define SOFTSERIAL_RX_PIN
  2
#define SOFTSERIAL_TX_PIN  3

SoftwareSerial softSerial(SOFTSERIAL_RX_PIN,SOFTSERIAL_TX_PIN);

int
  in1 = 8;   //L298n pins and here I didn't add the speed control
int in2 = 9;
int
  in3 = 10;
int in4 = 11;

void setup() {
  
 pinMode(in1, OUTPUT);

  pinMode(in2, OUTPUT);
 pinMode(in3, OUTPUT);
 pinMode(in4, OUTPUT);


  softSerial.begin(9600);
 softSerial.listen();
}

void loop() {
    int
  cmd;
    if(softSerial.available())
    {
        cmd = softSerial.read();

   
    }
    
    if(cmd==19){   //I removed the command list here I used
  "Start"
    Forward();    //Left Right and Stop and cmd==their number
    delay(2000);
  //I added a delay to stop it you can remove it and use a
    Stop();     //voice
  command to stop it
    }

    if(cmd==17){
    Right();
    delay(500);

    Stop();
    }

    if(cmd==16){
    Left();
    delay(500);

    Stop();
    }
       
    if(cmd==18)
    Stop();

}

//Classic
  L298n Driver functions
void Forward(){
  digitalWrite(in1, LOW); 
  digitalWrite(in2,
  HIGH);
  digitalWrite(in3, HIGH);
  digitalWrite(in4, LOW);  
}


void
  Left(){
  digitalWrite(in1, LOW); 
  digitalWrite(in2, HIGH);
  digitalWrite(in3,
  LOW);
  digitalWrite(in4, LOW);  
}

void Right(){
  digitalWrite(in1,
  LOW); 
  digitalWrite(in2, LOW);
  digitalWrite(in3, HIGH);
  digitalWrite(in4,
  LOW);  
}

void Stop(){
  digitalWrite(in1, LOW); 
  digitalWrite(in2,
  LOW);
  digitalWrite(in3, LOW);
  digitalWrite(in4, LOW);  
}

Downloadable files

Basic Wiring

Here's how you can test your module with the basic code, the speaker is optional

Basic Wiring

Basic Wiring

Here's how you can test your module with the basic code, the speaker is optional

Basic Wiring

With LEDs

Here's my 1st examples just lighting LEDs with voice commands I considered the 2 Leds on 7 as my lights and the other ones just lights on and off with a random code

With LEDs

2WD Robot

To control a 2WD robot

2WD Robot

To control a 2WD robot

2WD Robot

With LEDs

Here's my 1st examples just lighting LEDs with voice commands I considered the 2 Leds on 7 as my lights and the other ones just lights on and off with a random code

With LEDs

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Code

Downloadable files