Autobraking Rc Car

Create your own phone controlled smart car !!!

Jun 14, 2021

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1 respects

Components and supplies

Mini Breadboard

Arduino UNO

Solderless Breadboard Half Size

Portable Charger

DC Gearbox Motor 3-6V

Battery Holder, 9V

9V battery (generic)

2 in. Medium Duty Gray TPR Swivel Plate Caster

Adafruit Dual H-Bridge Motor Driver

HC-05 Bluetooth Module

Jumper wires (generic)

Tools and machines

Hot glue gun (generic)

Apps and platforms

Arduino IDE

MIT App Inventor 2

Project description

Code

Remote Controlled car with emergency brake

arduino

Remember to disconnect the Bluetooth module when uploading code to the Arduino board.

1const int OrgEnable = 3;// yellow motor
2const int TealIn =4; // yellow  motor input 4
3const int PurpIn = 5;// yellow motor input 3
4const int Greenenb=  11; // grey motor 
5const int GreenA = 8; // grey motor input 1
6const int GreenB  =7;// grey motor input 2
7char command;
8
9int inches = 0;
10
11int cm =  0;
12
13#include <NewPing.h>
14#define TRIGGER_PIN 9
15#define ECHO_PIN 10
16#define  MAX_DISTANCE 200
17
18
19
20NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE);
21float  duration, distance;
22 
23  void setup()
24{
25  Serial.begin(9600);
26  pinMode(OrgEnable,  OUTPUT);
27  pinMode(TealIn, OUTPUT);
28  pinMode(PurpIn, OUTPUT);
29  pinMode(A5,INPUT);
30  
31  
32  digitalWrite(OrgEnable,LOW);
33  digitalWrite( TealIn, LOW);
34  digitalWrite( PurpIn, LOW);
35  
36  pinMode(Greenenb, OUTPUT);
37  pinMode(GreenA,  OUTPUT);
38  pinMode(GreenB, OUTPUT);
39  
40  digitalWrite(Greenenb,LOW);
41  digitalWrite( GreenA, LOW);
42  digitalWrite( GreenB, LOW);
43  
44}
45
46void  loop()
47{  
48// Send ping, get distance in cm
49  distance =  sonar.ping_cm();
50
51  Serial.print(distance);
52  
53  // Send results to Serial Monitor
54  Serial.print("Distance  = ");
55  
56  if (distance <= 12 ) 
57  {
58      digitalWrite(TealIn,LOW);  
59  
60    digitalWrite(PurpIn,LOW);
61    
62     // delay(10);
63    
64      digitalWrite(GreenA,LOW); 
65  
66    digitalWrite(GreenB,LOW);
67    
68    Serial.print(distance);
69    Serial.println(" cm");
70  }
71  else 
72  {
73    
74    Serial.println("Out of range");
75  }
76  delay(50);
77  
78if(Serial.available()){
79  
80  command = Serial.read();
81  Serial.println(command);
82  
83  FowardM1();
84  FowardM2();
85  delay(20);
86  Right();
87  delay(20);
88  OffM2();
89  delay(20);
90  left();
91  delay(20);
92  ReverseM1();
93  ReverseM2();
94  delay(20);
95  OffM1();
96  
97
98}
99  
100   }
101void FowardM1(){  //  motor 1 is M1
102  if (command==1){
103   digitalWrite(TealIn,HIGH);
104 
105  digitalWrite(PurpIn,LOW);
106  
107  // ramp up
108  for(int counter= 0;counter<=255;counter ++){
109  analogWrite(OrgEnable,counter);  // yellow motor on
110  analogWrite(Greenenb,counter);
111  }
112 }
113}
114
115void  FowardM2(){ // M2 is motor 2
116  
117  if (command==1){
118   digitalWrite(GreenA,HIGH);
119  
120  digitalWrite(GreenB,LOW);
121  // ramp up
122  for(int counter= 0;counter<=255;counter  ++){
123  analogWrite(OrgEnable,counter); // yellow motor on
124  analogWrite(Greenenb,counter);
125  }
126 }
127}
128
129void Right(){
130 if (command==4){
131   
132  digitalWrite(TealIn,HIGH);
133  
134  digitalWrite(PurpIn,LOW);
135  
136  // ramp up
137  for(int counter= 0;counter<=255;counter  ++){
138  analogWrite(OrgEnable,counter); // yellow motor on
139  analogWrite(Greenenb,counter);
140  }
141  delay(20);
142   digitalWrite(GreenA,LOW); 
143  
144digitalWrite(GreenB,LOW);
145  }
146}
147
148void OffM2(){
149 if (command==0){
150  digitalWrite(GreenA,LOW);  
151  
152digitalWrite(GreenB,LOW);
153  }
154}
155void left(){
156  if (command==3){
157   digitalWrite(GreenA,HIGH);
158 
159  digitalWrite(GreenB,LOW);
160  // ramp up
161  for(int counter= 0;counter<=255;counter ++){
162  analogWrite(OrgEnable,counter);  // yellow motor on
163  analogWrite(Greenenb,counter);
164  }
165    delay(20);
166    
167   digitalWrite(TealIn,LOW); 
168  
169digitalWrite(PurpIn,LOW);
170    
171  }
172}
173
174void ReverseM1 (){
175  if (command==2){
176 digitalWrite(TealIn,LOW);
177  
178 digitalWrite(PurpIn,HIGH); 
179   
180  for(int counter= 255;counter<=0;counter  --){
181  analogWrite(OrgEnable,counter); // yellow motor on
182  analogWrite(Greenenb,counter);
183  }
184}
185}
186
187void ReverseM2(){
188  if (command==2){
189   digitalWrite(GreenA,LOW);
190  
191 digitalWrite(GreenB,HIGH);
192  
193   for(int counter= 255;counter<=0;counter  --){
194  analogWrite(OrgEnable,counter); // yellow motor on
195  analogWrite(Greenenb,counter);
196  }
197 }
198}
199
200void OffM1(){
201 if (command==0){
202digitalWrite(TealIn,LOW);  
203  
204digitalWrite(PurpIn,LOW);
205  }
206}

const int OrgEnable = 3;// yellow motor
const int TealIn =4; // yellow  motor input 4
const int PurpIn = 5;// yellow motor input 3
const int Greenenb=  11; // grey motor 
const int GreenA = 8; // grey motor input 1
const int GreenB  =7;// grey motor input 2
char command;

int inches = 0;

int cm =  0;

#include <NewPing.h>
#define TRIGGER_PIN 9
#define ECHO_PIN 10
#define  MAX_DISTANCE 200



NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE);
float  duration, distance;
 
  void setup()
{
  Serial.begin(9600);
  pinMode(OrgEnable,  OUTPUT);
  pinMode(TealIn, OUTPUT);
  pinMode(PurpIn, OUTPUT);
  pinMode(A5,INPUT);
  
  
  digitalWrite(OrgEnable,LOW);
  digitalWrite( TealIn, LOW);
  digitalWrite( PurpIn, LOW);
  
  pinMode(Greenenb, OUTPUT);
  pinMode(GreenA,  OUTPUT);
  pinMode(GreenB, OUTPUT);
  
  digitalWrite(Greenenb,LOW);
  digitalWrite( GreenA, LOW);
  digitalWrite( GreenB, LOW);
  
}

void  loop()
{  
// Send ping, get distance in cm
  distance =  sonar.ping_cm();

  Serial.print(distance);
  
  // Send results to Serial Monitor
  Serial.print("Distance  = ");
  
  if (distance <= 12 ) 
  {
      digitalWrite(TealIn,LOW);  
  
    digitalWrite(PurpIn,LOW);
    
     // delay(10);
    
      digitalWrite(GreenA,LOW); 
  
    digitalWrite(GreenB,LOW);
    
    Serial.print(distance);
    Serial.println(" cm");
  }
  else 
  {
    
    Serial.println("Out of range");
  }
  delay(50);
  
if(Serial.available()){
  
  command = Serial.read();
  Serial.println(command);
  
  FowardM1();
  FowardM2();
  delay(20);
  Right();
  delay(20);
  OffM2();
  delay(20);
  left();
  delay(20);
  ReverseM1();
  ReverseM2();
  delay(20);
  OffM1();
  

}
  
   }
void FowardM1(){  //  motor 1 is M1
  if (command==1){
   digitalWrite(TealIn,HIGH);
 
  digitalWrite(PurpIn,LOW);
  
  // ramp up
  for(int counter= 0;counter<=255;counter ++){
  analogWrite(OrgEnable,counter);  // yellow motor on
  analogWrite(Greenenb,counter);
  }
 }
}

void  FowardM2(){ // M2 is motor 2
  
  if (command==1){
   digitalWrite(GreenA,HIGH);
  
  digitalWrite(GreenB,LOW);
  // ramp up
  for(int counter= 0;counter<=255;counter  ++){
  analogWrite(OrgEnable,counter); // yellow motor on
  analogWrite(Greenenb,counter);
  }
 }
}

void Right(){
 if (command==4){
   
  digitalWrite(TealIn,HIGH);
  
  digitalWrite(PurpIn,LOW);
  
  // ramp up
  for(int counter= 0;counter<=255;counter  ++){
  analogWrite(OrgEnable,counter); // yellow motor on
  analogWrite(Greenenb,counter);
  }
  delay(20);
   digitalWrite(GreenA,LOW); 
  
digitalWrite(GreenB,LOW);
  }
}

void OffM2(){
 if (command==0){
  digitalWrite(GreenA,LOW);  
  
digitalWrite(GreenB,LOW);
  }
}
void left(){
  if (command==3){
   digitalWrite(GreenA,HIGH);
 
  digitalWrite(GreenB,LOW);
  // ramp up
  for(int counter= 0;counter<=255;counter ++){
  analogWrite(OrgEnable,counter);  // yellow motor on
  analogWrite(Greenenb,counter);
  }
    delay(20);
    
   digitalWrite(TealIn,LOW); 
  
digitalWrite(PurpIn,LOW);
    
  }
}

void ReverseM1 (){
  if (command==2){
 digitalWrite(TealIn,LOW);
  
 digitalWrite(PurpIn,HIGH); 
   
  for(int counter= 255;counter<=0;counter  --){
  analogWrite(OrgEnable,counter); // yellow motor on
  analogWrite(Greenenb,counter);
  }
}
}

void ReverseM2(){
  if (command==2){
   digitalWrite(GreenA,LOW);
  
 digitalWrite(GreenB,HIGH);
  
   for(int counter= 255;counter<=0;counter  --){
  analogWrite(OrgEnable,counter); // yellow motor on
  analogWrite(Greenenb,counter);
  }
 }
}

void OffM1(){
 if (command==0){
digitalWrite(TealIn,LOW);  
  
digitalWrite(PurpIn,LOW);
  }
}

Remote Controlled car with emergency brake

arduino

Remember to disconnect the Bluetooth module when uploading code to the Arduino board.

1const int OrgEnable = 3;// yellow motor
2const int TealIn =4; // yellow
3  motor input 4
4const int PurpIn = 5;// yellow motor input 3
5const int Greenenb=
6  11; // grey motor 
7const int GreenA = 8; // grey motor input 1
8const int GreenB
9  =7;// grey motor input 2
10char command;
11
12int inches = 0;
13
14int cm =
15  0;
16
17#include <NewPing.h>
18#define TRIGGER_PIN 9
19#define ECHO_PIN 10
20#define
21  MAX_DISTANCE 200
22
23
24
25NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE);
26float
27  duration, distance;
28 
29  void setup()
30{
31  Serial.begin(9600);
32  pinMode(OrgEnable,
33  OUTPUT);
34  pinMode(TealIn, OUTPUT);
35  pinMode(PurpIn, OUTPUT);
36  pinMode(A5,INPUT);
37
38  
39  
40  digitalWrite(OrgEnable,LOW);
41  digitalWrite( TealIn, LOW);
42
43  digitalWrite( PurpIn, LOW);
44  
45  pinMode(Greenenb, OUTPUT);
46  pinMode(GreenA,
47  OUTPUT);
48  pinMode(GreenB, OUTPUT);
49  
50  digitalWrite(Greenenb,LOW);
51
52  digitalWrite( GreenA, LOW);
53  digitalWrite( GreenB, LOW);
54  
55}
56
57void
58  loop()
59{  
60// Send ping, get distance in cm
61  distance =  sonar.ping_cm();
62
63
64  Serial.print(distance);
65  
66  // Send results to Serial Monitor
67  Serial.print("Distance
68  = ");
69  
70  if (distance <= 12 ) 
71  {
72      digitalWrite(TealIn,LOW);
73  
74  
75    digitalWrite(PurpIn,LOW);
76    
77     // delay(10);
78    
79
80      digitalWrite(GreenA,LOW); 
81  
82    digitalWrite(GreenB,LOW);
83    
84
85    Serial.print(distance);
86    Serial.println(" cm");
87  }
88  else 
89
90  {
91    
92    Serial.println("Out of range");
93  }
94  delay(50);
95
96  
97if(Serial.available()){
98  
99  command = Serial.read();
100  Serial.println(command);
101
102  
103  FowardM1();
104  FowardM2();
105  delay(20);
106  Right();
107  delay(20);
108
109  OffM2();
110  delay(20);
111  left();
112  delay(20);
113  ReverseM1();
114  ReverseM2();
115
116  delay(20);
117  OffM1();
118  
119
120}
121  
122   }
123void FowardM1(){  //
124  motor 1 is M1
125  if (command==1){
126   digitalWrite(TealIn,HIGH);
127 
128  digitalWrite(PurpIn,LOW);
129
130  
131  // ramp up
132  for(int counter= 0;counter<=255;counter ++){
133  analogWrite(OrgEnable,counter);
134  // yellow motor on
135  analogWrite(Greenenb,counter);
136  }
137 }
138}
139
140void
141  FowardM2(){ // M2 is motor 2
142  
143  if (command==1){
144   digitalWrite(GreenA,HIGH);
145
146  
147  digitalWrite(GreenB,LOW);
148  // ramp up
149  for(int counter= 0;counter<=255;counter
150  ++){
151  analogWrite(OrgEnable,counter); // yellow motor on
152  analogWrite(Greenenb,counter);
153
154  }
155 }
156}
157
158void Right(){
159 if (command==4){
160   
161  digitalWrite(TealIn,HIGH);
162
163  
164  digitalWrite(PurpIn,LOW);
165  
166  // ramp up
167  for(int counter= 0;counter<=255;counter
168  ++){
169  analogWrite(OrgEnable,counter); // yellow motor on
170  analogWrite(Greenenb,counter);
171
172  }
173  delay(20);
174   digitalWrite(GreenA,LOW); 
175  
176digitalWrite(GreenB,LOW);
177
178  }
179}
180
181void OffM2(){
182 if (command==0){
183  digitalWrite(GreenA,LOW);
184  
185  
186digitalWrite(GreenB,LOW);
187  }
188}
189void left(){
190  if (command==3){
191
192   digitalWrite(GreenA,HIGH);
193 
194  digitalWrite(GreenB,LOW);
195  // ramp up
196
197  for(int counter= 0;counter<=255;counter ++){
198  analogWrite(OrgEnable,counter);
199  // yellow motor on
200  analogWrite(Greenenb,counter);
201  }
202    delay(20);
203
204    
205   digitalWrite(TealIn,LOW); 
206  
207digitalWrite(PurpIn,LOW);
208    
209
210  }
211}
212
213void ReverseM1 (){
214  if (command==2){
215 digitalWrite(TealIn,LOW);
216
217  
218 digitalWrite(PurpIn,HIGH); 
219   
220  for(int counter= 255;counter<=0;counter
221  --){
222  analogWrite(OrgEnable,counter); // yellow motor on
223  analogWrite(Greenenb,counter);
224
225  }
226}
227}
228
229void ReverseM2(){
230  if (command==2){
231   digitalWrite(GreenA,LOW);
232
233  
234 digitalWrite(GreenB,HIGH);
235  
236   for(int counter= 255;counter<=0;counter
237  --){
238  analogWrite(OrgEnable,counter); // yellow motor on
239  analogWrite(Greenenb,counter);
240
241  }
242 }
243}
244
245void OffM1(){
246 if (command==0){
247digitalWrite(TealIn,LOW);
248  
249  
250digitalWrite(PurpIn,LOW);
251  }
252}

const int OrgEnable = 3;// yellow motor
const int TealIn =4; // yellow
  motor input 4
const int PurpIn = 5;// yellow motor input 3
const int Greenenb=
  11; // grey motor 
const int GreenA = 8; // grey motor input 1
const int GreenB
  =7;// grey motor input 2
char command;

int inches = 0;

int cm =
  0;

#include <NewPing.h>
#define TRIGGER_PIN 9
#define ECHO_PIN 10
#define
  MAX_DISTANCE 200



NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE);
float
  duration, distance;
 
  void setup()
{
  Serial.begin(9600);
  pinMode(OrgEnable,
  OUTPUT);
  pinMode(TealIn, OUTPUT);
  pinMode(PurpIn, OUTPUT);
  pinMode(A5,INPUT);

  
  
  digitalWrite(OrgEnable,LOW);
  digitalWrite( TealIn, LOW);

  digitalWrite( PurpIn, LOW);
  
  pinMode(Greenenb, OUTPUT);
  pinMode(GreenA,
  OUTPUT);
  pinMode(GreenB, OUTPUT);
  
  digitalWrite(Greenenb,LOW);

  digitalWrite( GreenA, LOW);
  digitalWrite( GreenB, LOW);
  
}

void
  loop()
{  
// Send ping, get distance in cm
  distance =  sonar.ping_cm();


  Serial.print(distance);
  
  // Send results to Serial Monitor
  Serial.print("Distance
  = ");
  
  if (distance <= 12 ) 
  {
      digitalWrite(TealIn,LOW);
  
  
    digitalWrite(PurpIn,LOW);
    
     // delay(10);
    

      digitalWrite(GreenA,LOW); 
  
    digitalWrite(GreenB,LOW);
    

    Serial.print(distance);
    Serial.println(" cm");
  }
  else 

  {
    
    Serial.println("Out of range");
  }
  delay(50);

  
if(Serial.available()){
  
  command = Serial.read();
  Serial.println(command);

  
  FowardM1();
  FowardM2();
  delay(20);
  Right();
  delay(20);

  OffM2();
  delay(20);
  left();
  delay(20);
  ReverseM1();
  ReverseM2();

  delay(20);
  OffM1();
  

}
  
   }
void FowardM1(){  //
  motor 1 is M1
  if (command==1){
   digitalWrite(TealIn,HIGH);
 
  digitalWrite(PurpIn,LOW);

  
  // ramp up
  for(int counter= 0;counter<=255;counter ++){
  analogWrite(OrgEnable,counter);
  // yellow motor on
  analogWrite(Greenenb,counter);
  }
 }
}

void
  FowardM2(){ // M2 is motor 2
  
  if (command==1){
   digitalWrite(GreenA,HIGH);

  
  digitalWrite(GreenB,LOW);
  // ramp up
  for(int counter= 0;counter<=255;counter
  ++){
  analogWrite(OrgEnable,counter); // yellow motor on
  analogWrite(Greenenb,counter);

  }
 }
}

void Right(){
 if (command==4){
   
  digitalWrite(TealIn,HIGH);

  
  digitalWrite(PurpIn,LOW);
  
  // ramp up
  for(int counter= 0;counter<=255;counter
  ++){
  analogWrite(OrgEnable,counter); // yellow motor on
  analogWrite(Greenenb,counter);

  }
  delay(20);
   digitalWrite(GreenA,LOW); 
  
digitalWrite(GreenB,LOW);

  }
}

void OffM2(){
 if (command==0){
  digitalWrite(GreenA,LOW);
  
  
digitalWrite(GreenB,LOW);
  }
}
void left(){
  if (command==3){

   digitalWrite(GreenA,HIGH);
 
  digitalWrite(GreenB,LOW);
  // ramp up

  for(int counter= 0;counter<=255;counter ++){
  analogWrite(OrgEnable,counter);
  // yellow motor on
  analogWrite(Greenenb,counter);
  }
    delay(20);

    
   digitalWrite(TealIn,LOW); 
  
digitalWrite(PurpIn,LOW);
    

  }
}

void ReverseM1 (){
  if (command==2){
 digitalWrite(TealIn,LOW);

  
 digitalWrite(PurpIn,HIGH); 
   
  for(int counter= 255;counter<=0;counter
  --){
  analogWrite(OrgEnable,counter); // yellow motor on
  analogWrite(Greenenb,counter);

  }
}
}

void ReverseM2(){
  if (command==2){
   digitalWrite(GreenA,LOW);

  
 digitalWrite(GreenB,HIGH);
  
   for(int counter= 255;counter<=0;counter
  --){
  analogWrite(OrgEnable,counter); // yellow motor on
  analogWrite(Greenenb,counter);

  }
 }
}

void OffM1(){
 if (command==0){
digitalWrite(TealIn,LOW);
  
  
digitalWrite(PurpIn,LOW);
  }
}

Downloadable files

Schematic

Attaching the jumper cables: Connect 5v on the arduino to the breadboard Connect GND on the arduino to the breadboard Connect enable1,2 to digital pin 11 Connect input 1 to digital pin 8 Connect output 1 to the negative of the hobby gearmotor Connect GND(4) to ground on the breadboard Connect output 2 to positive of the hobby gearmotor Connect input 2 to digital pin 7 Connect Vcc 2 to 9v battery Connect enable 3,4 to digital pin 3 Connect input 3 to digital pin 4 Connect output 3 to the positive of the second hobby gearmotor Connect GND(13) to ground on the breadboard Connect output 4 to the negative of the second hobby gearmotor Connect Vcc 1 to 5v on the breadboard Connect input 4 to digital pin 5 Connecting the Bluetooth module: Connect Vcc to the power on the breadboard Connect GND to the ground on the breadboard Connect RXD to digital pin 1 Connect TXD to digital pin 0 Connecting the Ultrasonic Range Finder: Connect GND to ground on the breadboard Connect 5v to power on the breadboard Connect echo to digital pin 10 Connect trig to digital pin 9

Schematic

MIT App

Setting up the app: To set up this app follow the block commands shown in the diagram

MIT App

Final result

1)Glue the hobby gear motors to the bottom of the base of the car 2)Drill the caster wheel to the back of the base 3)Attach all the breadboards and arduino to the base

Final result

Style

Even though this is not an essential component of this project I chose to paint the wooden base that I decided to use. I did this to add my aspect to this project.

Style

Sketch

It is good draw a project for a physical visualization and to label each component for clarity.

Sketch

Style

Even though this is not an essential component of this project I chose to paint the wooden base that I decided to use. I did this to add my aspect to this project.

Style

Prototype

Before building the final product of your project it is important to prototype the project. Through building this project on a smaller scale or a cheaper material you can adequately size and organize each part of the project.

Prototype

Final result

1)Glue the hobby gear motors to the bottom of the base of the car 2)Drill the caster wheel to the back of the base 3)Attach all the breadboards and arduino to the base

Final result

MIT App

Setting up the app: To set up this app follow the block commands shown in the diagram

MIT App

Schematic

Sketch

It is good draw a project for a physical visualization and to label each component for clarity.

Sketch

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omar4017

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