Arduino Bluetooth RC Car

This is our new Bluetooth RC car - based on our favorite Arduino Uno!

Aug 19, 2019

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Components and supplies

Ceramic Disc Capacitor, 22 pF

Pin header 1x5 Female

Buzzer

Resistor 10k ohm

16 pin dip socket

Capacitor 10 µF

Dual H-Bridge motor drivers L293D

ATmega328

HC-06 Bluetooth Module

28 pin dip socket

Arduino USB 2 Serial micro

Pin header 1x40 Male

16 MHz Crystal

screw terminal 2P 2.54mm

Tools and machines

Wire Stripper & Cutter, 18-10 AWG / 0.75-4mm² Capacity Wires

Solder Wire, Lead Free

Soldering iron (generic)

Apps and platforms

Arduino IDE

Project description

Code

Arduino Bluetooth Car

c_cpp

1/* Arduino Bluetooth Car<br> * Created by Vasilakis Michalis // updated:   31/7/2019
2 * More information at www.ardumotive.com
3 */
4#include 
5//Software   serial connection for bt module
6SoftwareSerial btSerial(A2,A3); // RX & TX
7
8//L293   Connection   
9const int motorA1  = 5;  // Pin  2 of L293
10const int motorA2   = 3;  // Pin  7 of L293
11const int motorB1  = 11; // Pin 10 of L293
12const   int motorB2  = 10;  // Pin 14 of L293
13//Leds connected to Arduino UNO Pin 12
14const   int front_lights  = 8;
15const int back_lights = 7;
16//Buzzer / Speaker to Arduino   UNO Pin 3
17const int buzzer = 2 ;   
18
19//Useful Variables
20int i=0;
21int   j=0;
22char state;
23
24void setup() {
25  // Initialize serial communication   at 9600 bits per second:
26  btSerial.begin(9600);
27  Serial.begin(9600); //   Only for debugging
28  // Set pins as outputs:
29  pinMode(motorA1, OUTPUT);
30   pinMode(motorA2, OUTPUT);
31  pinMode(motorB1, OUTPUT);
32  pinMode(motorB2,   OUTPUT);
33  pinMode(front_lights, OUTPUT);
34  pinMode(back_lights, OUTPUT);
35   delay(500);
36  //Stop all motors
37  digitalWrite(motorA1, LOW);
38  digitalWrite(motorA2,   LOW);
39  digitalWrite(motorB1, LOW);
40  digitalWrite(motorB2, LOW);
41}
42   
43void loop() {
44  //Save income data to variable 'state'
45    if(btSerial.available()   > 0){     
46      state = btSerial.read(); 
47      Serial.println(state);  
48     }	  
49  /***********************Forward****************************/
50   //If state is equal with letter 'F', car will go forward!
51    if (state ==   'F') {
52    	digitalWrite(motorA1, HIGH); digitalWrite(motorA2, 0);
53      digitalWrite(motorB1,   0);      digitalWrite(motorB2, 0); 
54      Serial.println("Moving Forward");
55     }
56  /**********************Forward Left************************/
57  //If   state is equal with letter 'G', car will go forward left
58    else if (state ==   'G') {
59    	digitalWrite(motorA1, HIGH); digitalWrite(motorA2, 0);  
60      digitalWrite(motorB1,   HIGH);    digitalWrite(motorB2, 0);
61      Serial.println("Moving Forward Left");   
62    }
63  /**********************Forward Right************************/
64   //If state is equal with letter 'I', car will go forward right
65    else if   (state == 'I') {
66      digitalWrite(motorA1, HIGH); digitalWrite(motorA2, 0);   
67      digitalWrite(motorB1, 0);      digitalWrite(motorB2, HIGH); 
68      Serial.println("Moving   Forward Right");
69    }
70  /***********************Backward****************************/
71   //If state is equal with letter 'B', car will go backward
72    else if (state   == 'B') {
73    	digitalWrite(motorA1, 0);   digitalWrite(motorA2, HIGH); 
74       digitalWrite(motorB1, 0);   digitalWrite(motorB2, 0); 
75      Serial.println("Moving   Backward");
76    }
77  /**********************Backward Left************************/
78   //If state is equal with letter 'H', car will go backward left
79    else if   (state == 'H') {
80    	digitalWrite(motorA1, 0);   digitalWrite(motorA2, HIGH);   
81      digitalWrite(motorB1, HIGH); digitalWrite(motorB2, 0);
82      Serial.println("Moving   Backward Left"); 
83    }
84  /**********************Backward Right************************/
85   //If state is equal with letter 'J', car will go backward right
86    else if   (state == 'J') {
87    	digitalWrite(motorA1, 0);   digitalWrite(motorA2, HIGH);   
88      digitalWrite(motorB1, 0);   digitalWrite(motorB2, HIGH); 
89      Serial.println("Moving   Backward Right");
90    }
91  /***************************Left*****************************/
92   //If state is equal with letter 'L', wheels will turn left
93    else if (state   == 'L') {
94    	digitalWrite(motorA1, 0);   digitalWrite(motorA2, 0); 
95      digitalWrite(motorB1,   HIGH); digitalWrite(motorB2, 0); 
96      Serial.println("Turn Left");
97    }
98   /***************************Right*****************************/
99  //If state   is equal with letter 'R', wheels will turn right
100    else if (state == 'R') {
101     	digitalWrite(motorA1, 0);   digitalWrite(motorA2, 0); 
102      digitalWrite(motorB1,   0);   digitalWrite(motorB2, HIGH); 
103      Serial.println("Turn Right");		
104     }
105  /************************Lights*****************************/
106  //If   state is equal with letter 'W/w', turn front leds on or of off
107    else if (state   == 'W') {
108      digitalWrite(front_lights, HIGH); 
109      Serial.println("Turning   front lights ON");
110    }
111    else if (state == 'w') {
112      digitalWrite(front_lights,   LOW); 
113      Serial.println("Turning front lights OFF");
114    }
115  /************************Lights*****************************/
116   //If state is equal with letter 'U/u', turn back leds on or of off
117    else   if (state == 'U') {
118      digitalWrite(back_lights, HIGH); 
119      Serial.println("Turning   rear lights ON");
120    }
121    else if (state == 'u') {
122      digitalWrite(back_lights,   LOW); 
123      Serial.println("Turning rear lights OFF");
124    }  
125  /**********************Horn   sound***************************/
126  //If state is equal with letter 'V', play   (or stop) horn sound
127    else if (state == 'V'){
128      tone(buzzer,500);
129       Serial.println("Playing horn sound");
130    }
131    else if (state ==   'v'){
132      noTone(buzzer);
133      Serial.println("Stop playing horn sound");
134     }
135  /************************Stop*****************************/
136  //If   state is equal with letter 'S', stop the car
137    else if (state == 'S'){
138         digitalWrite(motorA1, 0);  digitalWrite(motorA2, 0); 
139        digitalWrite(motorB1,   0);  digitalWrite(motorB2, 0);
140        Serial.println("STOP");
141    }  
142}

/* Arduino Bluetooth Car<br> * Created by Vasilakis Michalis // updated:   31/7/2019
 * More information at www.ardumotive.com
 */
#include 
//Software   serial connection for bt module
SoftwareSerial btSerial(A2,A3); // RX & TX

//L293   Connection   
const int motorA1  = 5;  // Pin  2 of L293
const int motorA2   = 3;  // Pin  7 of L293
const int motorB1  = 11; // Pin 10 of L293
const   int motorB2  = 10;  // Pin 14 of L293
//Leds connected to Arduino UNO Pin 12
const   int front_lights  = 8;
const int back_lights = 7;
//Buzzer / Speaker to Arduino   UNO Pin 3
const int buzzer = 2 ;   

//Useful Variables
int i=0;
int   j=0;
char state;

void setup() {
  // Initialize serial communication   at 9600 bits per second:
  btSerial.begin(9600);
  Serial.begin(9600); //   Only for debugging
  // Set pins as outputs:
  pinMode(motorA1, OUTPUT);
   pinMode(motorA2, OUTPUT);
  pinMode(motorB1, OUTPUT);
  pinMode(motorB2,   OUTPUT);
  pinMode(front_lights, OUTPUT);
  pinMode(back_lights, OUTPUT);
   delay(500);
  //Stop all motors
  digitalWrite(motorA1, LOW);
  digitalWrite(motorA2,   LOW);
  digitalWrite(motorB1, LOW);
  digitalWrite(motorB2, LOW);
}
   
void loop() {
  //Save income data to variable 'state'
    if(btSerial.available()   > 0){     
      state = btSerial.read(); 
      Serial.println(state);  
     }	  
  /***********************Forward****************************/
   //If state is equal with letter 'F', car will go forward!
    if (state ==   'F') {
    	digitalWrite(motorA1, HIGH); digitalWrite(motorA2, 0);
      digitalWrite(motorB1,   0);      digitalWrite(motorB2, 0); 
      Serial.println("Moving Forward");
     }
  /**********************Forward Left************************/
  //If   state is equal with letter 'G', car will go forward left
    else if (state ==   'G') {
    	digitalWrite(motorA1, HIGH); digitalWrite(motorA2, 0);  
      digitalWrite(motorB1,   HIGH);    digitalWrite(motorB2, 0);
      Serial.println("Moving Forward Left");   
    }
  /**********************Forward Right************************/
   //If state is equal with letter 'I', car will go forward right
    else if   (state == 'I') {
      digitalWrite(motorA1, HIGH); digitalWrite(motorA2, 0);   
      digitalWrite(motorB1, 0);      digitalWrite(motorB2, HIGH); 
      Serial.println("Moving   Forward Right");
    }
  /***********************Backward****************************/
   //If state is equal with letter 'B', car will go backward
    else if (state   == 'B') {
    	digitalWrite(motorA1, 0);   digitalWrite(motorA2, HIGH); 
       digitalWrite(motorB1, 0);   digitalWrite(motorB2, 0); 
      Serial.println("Moving   Backward");
    }
  /**********************Backward Left************************/
   //If state is equal with letter 'H', car will go backward left
    else if   (state == 'H') {
    	digitalWrite(motorA1, 0);   digitalWrite(motorA2, HIGH);   
      digitalWrite(motorB1, HIGH); digitalWrite(motorB2, 0);
      Serial.println("Moving   Backward Left"); 
    }
  /**********************Backward Right************************/
   //If state is equal with letter 'J', car will go backward right
    else if   (state == 'J') {
    	digitalWrite(motorA1, 0);   digitalWrite(motorA2, HIGH);   
      digitalWrite(motorB1, 0);   digitalWrite(motorB2, HIGH); 
      Serial.println("Moving   Backward Right");
    }
  /***************************Left*****************************/
   //If state is equal with letter 'L', wheels will turn left
    else if (state   == 'L') {
    	digitalWrite(motorA1, 0);   digitalWrite(motorA2, 0); 
      digitalWrite(motorB1,   HIGH); digitalWrite(motorB2, 0); 
      Serial.println("Turn Left");
    }
   /***************************Right*****************************/
  //If state   is equal with letter 'R', wheels will turn right
    else if (state == 'R') {
     	digitalWrite(motorA1, 0);   digitalWrite(motorA2, 0); 
      digitalWrite(motorB1,   0);   digitalWrite(motorB2, HIGH); 
      Serial.println("Turn Right");		
     }
  /************************Lights*****************************/
  //If   state is equal with letter 'W/w', turn front leds on or of off
    else if (state   == 'W') {
      digitalWrite(front_lights, HIGH); 
      Serial.println("Turning   front lights ON");
    }
    else if (state == 'w') {
      digitalWrite(front_lights,   LOW); 
      Serial.println("Turning front lights OFF");
    }
  /************************Lights*****************************/
   //If state is equal with letter 'U/u', turn back leds on or of off
    else   if (state == 'U') {
      digitalWrite(back_lights, HIGH); 
      Serial.println("Turning   rear lights ON");
    }
    else if (state == 'u') {
      digitalWrite(back_lights,   LOW); 
      Serial.println("Turning rear lights OFF");
    }  
  /**********************Horn   sound***************************/
  //If state is equal with letter 'V', play   (or stop) horn sound
    else if (state == 'V'){
      tone(buzzer,500);
       Serial.println("Playing horn sound");
    }
    else if (state ==   'v'){
      noTone(buzzer);
      Serial.println("Stop playing horn sound");
     }
  /************************Stop*****************************/
  //If   state is equal with letter 'S', stop the car
    else if (state == 'S'){
         digitalWrite(motorA1, 0);  digitalWrite(motorA2, 0); 
        digitalWrite(motorB1,   0);  digitalWrite(motorB2, 0);
        Serial.println("STOP");
    }  
}

Arduino Bluetooth Car

c_cpp

1/* Arduino Bluetooth Car<br> * Created by Vasilakis Michalis // updated:  31/7/2019
2 * More information at www.ardumotive.com
3 */
4#include 
5//Software  serial connection for bt module
6SoftwareSerial btSerial(A2,A3); // RX & TX
7
8//L293  Connection   
9const int motorA1  = 5;  // Pin  2 of L293
10const int motorA2  = 3;  // Pin  7 of L293
11const int motorB1  = 11; // Pin 10 of L293
12const  int motorB2  = 10;  // Pin 14 of L293
13//Leds connected to Arduino UNO Pin 12
14const  int front_lights  = 8;
15const int back_lights = 7;
16//Buzzer / Speaker to Arduino  UNO Pin 3
17const int buzzer = 2 ;   
18
19//Useful Variables
20int i=0;
21int  j=0;
22char state;
23
24void setup() {
25  // Initialize serial communication  at 9600 bits per second:
26  btSerial.begin(9600);
27  Serial.begin(9600); //  Only for debugging
28  // Set pins as outputs:
29  pinMode(motorA1, OUTPUT);
30  pinMode(motorA2, OUTPUT);
31  pinMode(motorB1, OUTPUT);
32  pinMode(motorB2,  OUTPUT);
33  pinMode(front_lights, OUTPUT);
34  pinMode(back_lights, OUTPUT);
35  delay(500);
36  //Stop all motors
37  digitalWrite(motorA1, LOW);
38  digitalWrite(motorA2,  LOW);
39  digitalWrite(motorB1, LOW);
40  digitalWrite(motorB2, LOW);
41}
42  
43void loop() {
44  //Save income data to variable 'state'
45    if(btSerial.available()  > 0){     
46      state = btSerial.read(); 
47      Serial.println(state);  
48    }	  
49  /***********************Forward****************************/
50  //If state is equal with letter 'F', car will go forward!
51    if (state ==  'F') {
52    	digitalWrite(motorA1, HIGH); digitalWrite(motorA2, 0);
53      digitalWrite(motorB1,  0);      digitalWrite(motorB2, 0); 
54      Serial.println("Moving Forward");
55    }
56  /**********************Forward Left************************/
57  //If  state is equal with letter 'G', car will go forward left
58    else if (state ==  'G') {
59    	digitalWrite(motorA1, HIGH); digitalWrite(motorA2, 0);  
60      digitalWrite(motorB1,  HIGH);    digitalWrite(motorB2, 0);
61      Serial.println("Moving Forward Left");  
62    }
63  /**********************Forward Right************************/
64  //If state is equal with letter 'I', car will go forward right
65    else if  (state == 'I') {
66      digitalWrite(motorA1, HIGH); digitalWrite(motorA2, 0);  
67      digitalWrite(motorB1, 0);      digitalWrite(motorB2, HIGH); 
68      Serial.println("Moving  Forward Right");
69    }
70  /***********************Backward****************************/
71  //If state is equal with letter 'B', car will go backward
72    else if (state  == 'B') {
73    	digitalWrite(motorA1, 0);   digitalWrite(motorA2, HIGH); 
74      digitalWrite(motorB1, 0);   digitalWrite(motorB2, 0); 
75      Serial.println("Moving  Backward");
76    }
77  /**********************Backward Left************************/
78  //If state is equal with letter 'H', car will go backward left
79    else if  (state == 'H') {
80    	digitalWrite(motorA1, 0);   digitalWrite(motorA2, HIGH);  
81      digitalWrite(motorB1, HIGH); digitalWrite(motorB2, 0);
82      Serial.println("Moving  Backward Left"); 
83    }
84  /**********************Backward Right************************/
85  //If state is equal with letter 'J', car will go backward right
86    else if  (state == 'J') {
87    	digitalWrite(motorA1, 0);   digitalWrite(motorA2, HIGH);  
88      digitalWrite(motorB1, 0);   digitalWrite(motorB2, HIGH); 
89      Serial.println("Moving  Backward Right");
90    }
91  /***************************Left*****************************/
92  //If state is equal with letter 'L', wheels will turn left
93    else if (state  == 'L') {
94    	digitalWrite(motorA1, 0);   digitalWrite(motorA2, 0); 
95      digitalWrite(motorB1,  HIGH); digitalWrite(motorB2, 0); 
96      Serial.println("Turn Left");
97    }
98  /***************************Right*****************************/
99  //If state  is equal with letter 'R', wheels will turn right
100    else if (state == 'R') {
101    	digitalWrite(motorA1, 0);   digitalWrite(motorA2, 0); 
102      digitalWrite(motorB1,  0);   digitalWrite(motorB2, HIGH); 
103      Serial.println("Turn Right");		
104    }
105  /************************Lights*****************************/
106  //If  state is equal with letter 'W/w', turn front leds on or of off
107    else if (state  == 'W') {
108      digitalWrite(front_lights, HIGH); 
109      Serial.println("Turning  front lights ON");
110    }
111    else if (state == 'w') {
112      digitalWrite(front_lights,  LOW); 
113      Serial.println("Turning front lights OFF");
114    }
115  /************************Lights*****************************/
116  //If state is equal with letter 'U/u', turn back leds on or of off
117    else  if (state == 'U') {
118      digitalWrite(back_lights, HIGH); 
119      Serial.println("Turning  rear lights ON");
120    }
121    else if (state == 'u') {
122      digitalWrite(back_lights,  LOW); 
123      Serial.println("Turning rear lights OFF");
124    }  
125  /**********************Horn  sound***************************/
126  //If state is equal with letter 'V', play  (or stop) horn sound
127    else if (state == 'V'){
128      tone(buzzer,500);
129      Serial.println("Playing horn sound");
130    }
131    else if (state ==  'v'){
132      noTone(buzzer);
133      Serial.println("Stop playing horn sound");
134    }
135  /************************Stop*****************************/
136  //If  state is equal with letter 'S', stop the car
137    else if (state == 'S'){
138        digitalWrite(motorA1, 0);  digitalWrite(motorA2, 0); 
139        digitalWrite(motorB1,  0);  digitalWrite(motorB2, 0);
140        Serial.println("STOP");
141    }  
142}

/* Arduino Bluetooth Car<br> * Created by Vasilakis Michalis // updated:  31/7/2019
 * More information at www.ardumotive.com
 */
#include 
//Software  serial connection for bt module
SoftwareSerial btSerial(A2,A3); // RX & TX

//L293  Connection   
const int motorA1  = 5;  // Pin  2 of L293
const int motorA2  = 3;  // Pin  7 of L293
const int motorB1  = 11; // Pin 10 of L293
const  int motorB2  = 10;  // Pin 14 of L293
//Leds connected to Arduino UNO Pin 12
const  int front_lights  = 8;
const int back_lights = 7;
//Buzzer / Speaker to Arduino  UNO Pin 3
const int buzzer = 2 ;   

//Useful Variables
int i=0;
int  j=0;
char state;

void setup() {
  // Initialize serial communication  at 9600 bits per second:
  btSerial.begin(9600);
  Serial.begin(9600); //  Only for debugging
  // Set pins as outputs:
  pinMode(motorA1, OUTPUT);
  pinMode(motorA2, OUTPUT);
  pinMode(motorB1, OUTPUT);
  pinMode(motorB2,  OUTPUT);
  pinMode(front_lights, OUTPUT);
  pinMode(back_lights, OUTPUT);
  delay(500);
  //Stop all motors
  digitalWrite(motorA1, LOW);
  digitalWrite(motorA2,  LOW);
  digitalWrite(motorB1, LOW);
  digitalWrite(motorB2, LOW);
}
  
void loop() {
  //Save income data to variable 'state'
    if(btSerial.available()  > 0){     
      state = btSerial.read(); 
      Serial.println(state);  
    }	  
  /***********************Forward****************************/
  //If state is equal with letter 'F', car will go forward!
    if (state ==  'F') {
    	digitalWrite(motorA1, HIGH); digitalWrite(motorA2, 0);
      digitalWrite(motorB1,  0);      digitalWrite(motorB2, 0); 
      Serial.println("Moving Forward");
    }
  /**********************Forward Left************************/
  //If  state is equal with letter 'G', car will go forward left
    else if (state ==  'G') {
    	digitalWrite(motorA1, HIGH); digitalWrite(motorA2, 0);  
      digitalWrite(motorB1,  HIGH);    digitalWrite(motorB2, 0);
      Serial.println("Moving Forward Left");  
    }
  /**********************Forward Right************************/
  //If state is equal with letter 'I', car will go forward right
    else if  (state == 'I') {
      digitalWrite(motorA1, HIGH); digitalWrite(motorA2, 0);  
      digitalWrite(motorB1, 0);      digitalWrite(motorB2, HIGH); 
      Serial.println("Moving  Forward Right");
    }
  /***********************Backward****************************/
  //If state is equal with letter 'B', car will go backward
    else if (state  == 'B') {
    	digitalWrite(motorA1, 0);   digitalWrite(motorA2, HIGH); 
      digitalWrite(motorB1, 0);   digitalWrite(motorB2, 0); 
      Serial.println("Moving  Backward");
    }
  /**********************Backward Left************************/
  //If state is equal with letter 'H', car will go backward left
    else if  (state == 'H') {
    	digitalWrite(motorA1, 0);   digitalWrite(motorA2, HIGH);  
      digitalWrite(motorB1, HIGH); digitalWrite(motorB2, 0);
      Serial.println("Moving  Backward Left"); 
    }
  /**********************Backward Right************************/
  //If state is equal with letter 'J', car will go backward right
    else if  (state == 'J') {
    	digitalWrite(motorA1, 0);   digitalWrite(motorA2, HIGH);  
      digitalWrite(motorB1, 0);   digitalWrite(motorB2, HIGH); 
      Serial.println("Moving  Backward Right");
    }
  /***************************Left*****************************/
  //If state is equal with letter 'L', wheels will turn left
    else if (state  == 'L') {
    	digitalWrite(motorA1, 0);   digitalWrite(motorA2, 0); 
      digitalWrite(motorB1,  HIGH); digitalWrite(motorB2, 0); 
      Serial.println("Turn Left");
    }
  /***************************Right*****************************/
  //If state  is equal with letter 'R', wheels will turn right
    else if (state == 'R') {
    	digitalWrite(motorA1, 0);   digitalWrite(motorA2, 0); 
      digitalWrite(motorB1,  0);   digitalWrite(motorB2, HIGH); 
      Serial.println("Turn Right");		
    }
  /************************Lights*****************************/
  //If  state is equal with letter 'W/w', turn front leds on or of off
    else if (state  == 'W') {
      digitalWrite(front_lights, HIGH); 
      Serial.println("Turning  front lights ON");
    }
    else if (state == 'w') {
      digitalWrite(front_lights,  LOW); 
      Serial.println("Turning front lights OFF");
    }
  /************************Lights*****************************/
  //If state is equal with letter 'U/u', turn back leds on or of off
    else  if (state == 'U') {
      digitalWrite(back_lights, HIGH); 
      Serial.println("Turning  rear lights ON");
    }
    else if (state == 'u') {
      digitalWrite(back_lights,  LOW); 
      Serial.println("Turning rear lights OFF");
    }  
  /**********************Horn  sound***************************/
  //If state is equal with letter 'V', play  (or stop) horn sound
    else if (state == 'V'){
      tone(buzzer,500);
      Serial.println("Playing horn sound");
    }
    else if (state ==  'v'){
      noTone(buzzer);
      Serial.println("Stop playing horn sound");
    }
  /************************Stop*****************************/
  //If  state is equal with letter 'S', stop the car
    else if (state == 'S'){
        digitalWrite(motorA1, 0);  digitalWrite(motorA2, 0); 
        digitalWrite(motorB1,  0);  digitalWrite(motorB2, 0);
        Serial.println("STOP");
    }  
}

Downloadable files

PCB Schematic

Order it from pcbway.com and get 10pcs PCB for free! Instructions on how to order it can be found in the video that we have in first step. You can also make your changes here: https://easyeda.com/mi.vasilakis/My_PCB-9fb30c4a0c7e459cb9484f305015f0c8

PCB Schematic

Circuit Schematic

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