Arduino Ultra sonic sensor car

Using Arduino Motors, Mechanics, Power and CNC
1

I'm trying to make a car that avoid obstacles as it comes up to them and for some reason I cant get the motors to move

20211202_083711
20211202_0837111920×3950 450 KB

int trigPin = 9;
int echoPin = 10;

int revleft4 = 4;
int fwdleft5 = 5;
int revright6 = 6;
int fwdright7 = 7;

long duration, distance;

void setup() {

delay(random(500,2000));
Serial.begin(9600);
pinMode(revleft4, OUTPUT);
pinMode(fwdleft5, OUTPUT);
pinMode(revright6, OUTPUT);
pinMode(fwdright7, OUTPUT);

pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
}

void loop() {

digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
duration = pulseIn(echoPin, HIGH);
distance = duration / 58.2;
delay(10);
if (distance > 19)
{
digitalWrite(fwdright7, HIGH);
digitalWrite(revright6, LOW);
digitalWrite(fwdleft5, HIGH);
digitalWrite(revleft4, LOW);
}

if (distance < 18)
{
digitalWrite(fwdright7, LOW);
digitalWrite(revright6, LOW);
digitalWrite(fwdleft5, LOW);
digitalWrite(revleft4, LOW);
delay(500);
digitalWrite(fwdright7, LOW);
digitalWrite(revright6, HIGH);
digitalWrite(fwdleft5, LOW);
digitalWrite(revleft4, HIGH);
delay(500);
digitalWrite(fwdright7, LOW);
digitalWrite(revright6, LOW);
digitalWrite(fwdleft5, LOW);
digitalWrite(revleft4, LOW);
delay(100);
digitalWrite(fwdright7, HIGH);
digitalWrite(revright6, LOW);
digitalWrite(revleft4, LOW);
digitalWrite(fwdleft5, LOW);
delay(500);
}

}

2

20211202_083647
20211202_0836471920×3950 774 KB

3

20211202_083654
20211202_0836541920×3950 418 KB

4

20211202_083703
20211202_0837031920×3950 323 KB

5

20211202_094403
20211202_0944031920×3950 240 KB

6

Missing something? (apart from code tags!)

What happened to the code you had before, that only ran the motors?
Does that still work?

8 
int trigPin = 9;      // trig pin of HC-SR04
int echoPin = 10;     // Echo pin of HC-SR04

int revleft4 = 4;       //REVerse motion of Left motor
int fwdleft5 = 5;       //ForWarD motion of Left motor
int revright6 = 6;      //REVerse motion of Right motor
int fwdright7 = 7;      //ForWarD motion of Right motor

long duration, distance;

void setup() {
  
  delay(random(500,2000));   // delay for random time
  Serial.begin(9600);
  pinMode(revleft4, OUTPUT);      // set Motor pins as output
  pinMode(fwdleft5, OUTPUT);
  pinMode(revright6, OUTPUT);
  pinMode(fwdright7, OUTPUT);
  
  pinMode(trigPin, OUTPUT);         // set trig pin as output
  pinMode(echoPin, INPUT);          //set echo pin as input to capture reflected waves
}

void loop() {

  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);   
  digitalWrite(trigPin, HIGH);     // send waves for 10 us
  delayMicroseconds(10);
  duration = pulseIn(echoPin, HIGH); // receive reflected waves
  distance = duration / 58.2;   // convert to distance
  delay(10);
  if (distance > 19)            
  {
    digitalWrite(fwdright7, HIGH);                    // move forward
    digitalWrite(revright6, LOW);
    digitalWrite(fwdleft5, HIGH);                                
    digitalWrite(revleft4, LOW);                                                       
  }

  if (distance < 18)
  {
    digitalWrite(fwdright7, LOW);  //Stop                
    digitalWrite(revright6, LOW);
    digitalWrite(fwdleft5, LOW);                                
    digitalWrite(revleft4, LOW);
    delay(500);
    digitalWrite(fwdright7, LOW);      //movebackword         
    digitalWrite(revright6, HIGH);
    digitalWrite(fwdleft5, LOW);                                
    digitalWrite(revleft4, HIGH);
    delay(500);
    digitalWrite(fwdright7, LOW);  //Stop                
    digitalWrite(revright6, LOW);
    digitalWrite(fwdleft5, LOW);                                
    digitalWrite(revleft4, LOW);  
    delay(100);  
    digitalWrite(fwdright7, HIGH);       
    digitalWrite(revright6, LOW);   
    digitalWrite(revleft4, LOW);                                 
    digitalWrite(fwdleft5, LOW);  
    delay(500);
  }

}```
9

I figured it out apperently my brand new 9v battery didnt have enough power to supply swapped it out and it worked well

10

...and after a short while, neither will the new one.

Put it back in the smoke detector, and use AAs instead.

11

@lucas_ingalls, your topic has been moved to a more suitable location on the forum. Installation and Troubleshooting is not for problems with (nor for advise on) your project :wink: See About the Installation & Troubleshooting category.

12

This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.