DC Motors connected to l298n motor driver won't work

Other Hardware Robotics
1

I bought an arduino, l298n motor driver, ultrasonic sensor and all that stuff, i was so tired so i just took some code online, tested it and wen to bed, the next day i woke up, it worked, but then 7 hours later i come back home to edit the code for the ultrasonic sensor and to remove the cables connected to the motors and placing them back in, it does not work, i tried editing the code and everything, the serial monitor shows the ultrasonic sensor is working perfectly fine, the l298n motor driver lights up, but the dc motors won't move, i need help.

The code:

#include <SoftwareSerial.h>
#include <NewPing.h>


int TRIGGER_PIN = 10;
int ECHO_PIN = 11;


int ENA_PIN = 9;
int IN1_PIN = 8;
int IN2_PIN = 7;
int ENB_PIN = 3;
int IN3_PIN = 5;
int IN4_PIN = 4;

int MAX_DISTANCE = 200;

NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE);


void setup() {
  Serial.begin(9600);
  pinMode(ENA_PIN, OUTPUT);
  pinMode(IN1_PIN, OUTPUT);
  pinMode(IN2_PIN, OUTPUT);
  pinMode(ENB_PIN, OUTPUT);
  pinMode(IN3_PIN, OUTPUT);
  pinMode(IN4_PIN, OUTPUT);
}

void loop() {
  int distance = sonar.ping_cm();

  if (distance > 10) {
    Serial.print("Yes");
    digitalWrite(ENA_PIN, HIGH);
    digitalWrite(IN1_PIN, HIGH);
    digitalWrite(IN2_PIN, LOW);
    digitalWrite(ENB_PIN, HIGH);
    digitalWrite(IN3_PIN, HIGH);
    digitalWrite(IN4_PIN, LOW);
  } else {

    Serial.print("No");
    digitalWrite(ENA_PIN, HIGH);
    digitalWrite(IN1_PIN, LOW);
    digitalWrite(IN2_PIN, HIGH);
    digitalWrite(ENB_PIN, HIGH);
    digitalWrite(IN3_PIN, LOW);
    digitalWrite(IN4_PIN, HIGH);
  }
}
2

You never mention turning the power off to your project.

3

The power was on when i tested it

4

And it was on while you were removing and replacing the wires? If so, you can start your project over again because you killed the motor driver.

5

no it was off when i removed

6

My crystal ball is bad too.

7

my camera is bad

8

Recycle the dead 9V PP3 block battery and try using a 9-12V motor power supply, capable of a couple of Amperes. 6XAA will work.

1 Like
9

Hi, @ryanshamu

Have you tried the original working code?
Before you removed the cables.

Are you using a L298 IC or a module?

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

10

I am using the module

11

help

12

Hi,
Can you please post the original code that worked?

Can you please post a link to data/specs of the module?

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

1 Like
13

How are you powering this and can you post an annotated schematic showing exactly how you have wired it. This appears to be a hardware problem but without knowing what is there and how it is connected it is just guessing.

14 
int enA = 9;
int in1 = 8;
int in2 = 7;
// Motor B connections
int enB = 3;
int in3 = 5;
int in4 = 4;

void setup() {
	// Set all the motor control pins to outputs
	pinMode(enA, OUTPUT);
	pinMode(enB, OUTPUT);
	pinMode(in1, OUTPUT);
	pinMode(in2, OUTPUT);
	pinMode(in3, OUTPUT);
	pinMode(in4, OUTPUT);
	
	// Turn off motors - Initial state
	digitalWrite(in1, LOW);
	digitalWrite(in2, LOW);
	digitalWrite(in3, LOW);
	digitalWrite(in4, LOW);
}

void loop() {
	directionControl();
	delay(1000);
	speedControl();
	delay(1000);
}

// This function lets you control spinning direction of motors
void directionControl() {
	// Set motors to maximum speed
	// For PWM maximum possible values are 0 to 255
	analogWrite(enA, 255);
	analogWrite(enB, 255);

	// Turn on motor A & B
	digitalWrite(in1, HIGH);
	digitalWrite(in2, LOW);
	digitalWrite(in3, HIGH);
	digitalWrite(in4, LOW);
	delay(2000);
	
	// Now change motor directions
	digitalWrite(in1, LOW);
	digitalWrite(in2, HIGH);
	digitalWrite(in3, LOW);
	digitalWrite(in4, HIGH);
	delay(2000);
	
	// Turn off motors
	digitalWrite(in1, LOW);
	digitalWrite(in2, LOW);
	digitalWrite(in3, LOW);
	digitalWrite(in4, LOW);
}

// This function lets you control speed of the motors
void speedControl() {
	// Turn on motors
	digitalWrite(in1, LOW);
	digitalWrite(in2, HIGH);
	digitalWrite(in3, LOW);
	digitalWrite(in4, HIGH);
	
	// Accelerate from zero to maximum speed
	for (int i = 0; i < 256; i++) {
		analogWrite(enA, i);
		analogWrite(enB, i);
		delay(20);
	}
	
	// Decelerate from maximum speed to zero
	for (int i = 255; i >= 0; --i) {
		analogWrite(enA, i);
		analogWrite(enB, i);
		delay(20);
	}
	
	// Now turn off motors
	digitalWrite(in1, LOW);
	digitalWrite(in2, LOW);
	digitalWrite(in3, LOW);
	digitalWrite(in4, LOW);
}
15

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