The L298n motor can't move when I activate the severo motor

Projects Discussion and Showcase Product Design
1

The L298n motor works well when the program is no code with severo motor but the motor doesn't move while the severo motor code is in the program

#include <Ultrasonic.h>
#include <Servo.h>   //

Servo myservo;  // ???

//IRsencor
int DigitalPin =7;
int AnalogPin =A1;

//uira
const int trigPin = 5;             //Trig Pin
const int echoPin = 6;             //Echo Pin

long duration, cm, inches;
int BackwardSpeed = 50;
//Ultrasonic ultrasonic(8,9); // (Trig PIN,Echo PIN)//

//motor
int m1p1 =8;
int m1p2 =9;

int m2p1 =12;
int m2p2 =13;

const int pwm1 =10;
const int pwm2 =11;

void motorStop(){
  digitalWrite( m1p1 , LOW);
  digitalWrite( m1p2 , LOW);
  digitalWrite( m2p1 , LOW);
  digitalWrite( m2p2 , LOW);
  analogWrite(10, 0);
  analogWrite(11, 0);
}

void Backward(){
  digitalWrite( m1p1 , LOW);
  digitalWrite( m1p2 , HIGH);
  digitalWrite( m2p1 , HIGH);
  digitalWrite( m2p2 , LOW);
  analogWrite(10, 200);
  analogWrite(11, 200);
}

void forward(){
  digitalWrite( m1p1 , HIGH);
  digitalWrite( m1p2 , LOW);
  digitalWrite( m2p1 , LOW);
  digitalWrite( m2p2 , HIGH);
  analogWrite(10, 150);
  analogWrite(11, 200);
}

void Fforward(){
 digitalWrite( m1p1 , HIGH);
  digitalWrite( m1p2 , LOW);
  digitalWrite( m2p1 , LOW);
  digitalWrite( m2p2 , HIGH);
  analogWrite(10, 200);
  analogWrite(11, 250);
}

void left()
{
  digitalWrite( m1p1 , HIGH);
  digitalWrite( m1p2 , LOW);
  digitalWrite( m2p1 , LOW);
  digitalWrite( m2p2 , LOW);
  analogWrite(10, 150);
  analogWrite(11, 0);
}
void right()
{
  digitalWrite( m1p1 , LOW);
  digitalWrite( m1p2 , LOW);
  digitalWrite( m2p1 , LOW);
  digitalWrite( m2p2 , HIGH);
  analogWrite(10, 0);
  analogWrite(11, 150);
}

void setup() {
  delay(500);

    myservo.attach(3);  // 
    pinMode(m1p1, OUTPUT);
    pinMode(m1p2, OUTPUT);
    pinMode(m2p1, OUTPUT);
    pinMode(m2p2, OUTPUT);

    pinMode(pwm1, OUTPUT);
    pinMode(pwm2, OUTPUT);

    pinMode(DigitalPin, INPUT); // 
    pinMode(AnalogPin, INPUT); // 

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

    //
  digitalWrite( m1p1 , HIGH);
  digitalWrite( m2p2 , HIGH);
  digitalWrite( m1p2 , LOW);
  digitalWrite( m2p1 , LOW);
  
  
  analogWrite(10, 170);
  analogWrite(11, 200);
  delay (4000);
  digitalWrite( m1p1 , LOW);
  digitalWrite( m1p2 , LOW);
  digitalWrite( m2p1 , LOW);
  digitalWrite( m2p2 , LOW);
  analogWrite(10, 0);
  analogWrite(11, 0);
  myservo.write(180); //
  delay (1000);
}



void loop() {
  //IR
  boolean D_val = digitalRead(DigitalPin); // 
  int A_val = analogRead(AnalogPin);
  //if(A_val >400 )//

  //ultra
  digitalWrite(trigPin, LOW);
  delayMicroseconds(5);
  digitalWrite(trigPin, HIGH);     // 
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  pinMode(echoPin, INPUT);          // 
  duration = pulseIn(echoPin, HIGH);   // 
 
  cm = (duration/2) / 29.1;         //   
  Serial.println(cm);
  
     //
if (cm>30 && A_val>400)
  {
    forward ();


  }
else if (10<cm<30 &&A_val>400)
{
Fforward ();
}
else if (cm<10 &&A_val>400)
{

//myservo.write(120);
Fforward ();
delay(2000);
}
else if (A_val<400 && cm>30)
{
motorStop();
delay (10);
Backward();
delay(1000);
left();
delay (2000);
forward();
delay (1000);

}
else if (A_val<400 && cm<30)
{
  motorStop();
delay (10);
Backward();
delay(1000);
left();
delay (2000);
forward();
delay (1000);
}
  else
  {
    motorStop();
  }
}
2

When using the servo lib on UNO R3 ( or any 328P based board) you cannot use analog wite at pins 9 and 10. You must switch to an other pwm pin. See reference of servo.h:

On boards other than the Mega, use of the library disables analogWrite() (PWM) functionality on pins 9 and 10

3

so can the pwm pins t3,5,6or11 still work?

thanks!

4

Yes, only pins 9 and 10 are affected.

5

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