Arduino stops working after i run the project once or twice

Using Arduino Project Guidance
1

Hi! I'm pretty new to arduino and this is my first project, I'm trying to upload my code to the robot and it just stops working few mins after i upload it. i'm trying to build a obstacle avoidance robot who on sensing obstacle stops moving forwards, i have four wheels connected to 2 motors, 2 wheels for either side and l298n motor driver connected to motors, arduino uno, an ultrasonic sensor,i have 6 motor pins connected to 2 to 9 digital ports use 3 and 9 for pwm, and ultrasonic sensor pins are connected in 2 and 3, car starts running at 125 speed 2 sec after switch is on, stops if there is a obstacle near 5 cm,

here's my code

// Pin configuration
const int trigPin = 2;  // Connect Trig pin of the ultrasonic sensor to digital pin 2-black
const int echoPin = 3;  // Connect Echo pin of the ultrasonic sensor to digital pin 3

const int motor1A = 4;  // Motor 1 input A - connect to digital pin 4-white
const int motor1B = 5;  // Motor 1 input B - connect to digital pin 5-gray
const int motor2A = 6;  // Motor 2 input A - connect to digital pin 6-purple
const int motor2B = 7;  // Motor 2 input B - connect to digital pin 7-blue

const int thresholdDistance = 20;  // Set the threshold distance for obstacle detection

void setup() {
  // Motor control pins as output
  pinMode(motor1A, OUTPUT);
  pinMode(motor1B, OUTPUT);
  pinMode(motor2A, OUTPUT);
  pinMode(motor2B, OUTPUT);

  // Ultrasonic sensor pins
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);

  Serial.begin(9600);
}

void loop() {
  // Measure distance using the ultrasonic sensor
  long duration, distance;
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = duration * 0.034 / 2;

  Serial.print("Distance: ");
  Serial.println(distance);

  // Check if there is an obstacle within the threshold distance
  if (distance < thresholdDistance) {
    // Stop the motors if obstacle detected
    stopMotors();
  } else {
    // Move the robot forward if no obstacle
    moveForward();
  }
}

void moveForward() {
  digitalWrite(motor1A, HIGH);
  digitalWrite(motor1B, LOW);
  digitalWrite(motor2A, HIGH);
  digitalWrite(motor2B, LOW);
}

void stopMotors() {
  digitalWrite(motor1A, LOW);
  digitalWrite(motor1B, LOW);
  digitalWrite(motor2A, LOW);
  digitalWrite(motor2B, LOW);
}
//2 motor motor 1 ka pin ab hoga motor aage 125 speed
3

I'd add: what do you mean exactly with "stops working few mins after i upload it"? The robot stops and doesn't move anymore? Or keeps going, regardless of any obstacle? And when that happens, what you get on the serial monitor?

4

I think that @hirajvii tried to use code tags; hence I've fixed them.

@hirajvii, code tags for a block of code are 3 back ticks (```); they also need to be on their own line.

```
code here
```

5

@hirajvii I think you need to understand how ultrasonic sensors work.
In your code you put inside the loop() the reading (the "ping" signal and waiting for an echo return) but this will happen thousands of times per second! It means the sensor will rapidly send and receive so many echo signals per second, that it returns almost immediately, giving you very low values or even zero, so "stopMotors()" will be called every time.

So, the first thing I can suggest you is to add a "delay(500);" at the end of the loop() to send not more than 2 "ping" per second, and let us know.

But for the future, please always better describe what happens (what should do and what it doesn't) and what the code prints if some Serial.print() are used for debug purposes (as usually done).

6

Hi, @hirajvii
Welcome to t he forum.

You might be better to use the NewPing library to do your ultrasonic measurement.

Tom.. :grinning: :+1: :coffee: :australia:

7

Yeah, but it doesn't solve the issue, neither if the SR04 is a faulty one, nor with such thousands of pings per second he's doing.. :wink:

8

i just upload it, it works for a few seconds and just stops moving, even when there's no obstacle. moreover i have a switch in the robot, if i turn off the switch and turn it on again it never moves again, i have to reupload the code everytime to try to get it work

9

thanks for the reply! i'll try it again after correcting it and let you know!!

10

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