Hi Everyone,
I am making a simple 2w Obstacle Avoiding Robot using Arduino Uno, before assembling the Robot (car), i made a small code testing the motors and the motor driver (I used the l298n driver) and every thing worked smoothly, after assembling the robot and writing the code, i saw that the right motor isn't going backwards, I revised the code many times but didn't find anything to cause the motor not going backwards, I tried to invert the connections of the ports of the motor then it couldn't go forward. I searched in google but did't find anything that helped me in my problem, I don't know if you had or saw the same problem before but I hope you help me.
Here is my main code:
//LEFT MOTOR IS RIGHT MOTOR AND RIGHT MOTOR IS LEFT MOTOR
#include <Servo.h> //Servo motor library. This is standard library
#include <NewPing.h> //Ultrasonic sensor function library. You must install this library
//our L298N control pins
const int LeftMotorForward = 7;
const int LeftMotorBackward = 6;
const int RightMotorForward = 4;
const int RightMotorBackward = 5;
//sensor pins
#define trig_pin A1 //analog input 1
#define echo_pin A2 //analog input 2
#define maximum_distance 200
int distance = 100;
NewPing sonar(trig_pin, echo_pin, maximum_distance); //sensor function
Servo servo_motor; //our servo name
void setup(){
pinMode(RightMotorForward, OUTPUT);
pinMode(LeftMotorForward, OUTPUT);
pinMode(LeftMotorBackward, OUTPUT);
pinMode(RightMotorBackward, OUTPUT);
servo_motor.attach(10); //our servo pin
servo_motor.write(90);
delay(2000);
distance = readPing();
delay(100);
distance = readPing();
delay(100);
distance = readPing();
delay(100);
distance = readPing();
delay(100);
}
void loop(){
int distanceRight = 0;
int distanceLeft = 0;
delay(50);
if (distance <= 20){
moveStop();
delay(300);
moveBackward();
delay(400);
moveStop();
delay(300);
distanceRight = lookRight();
delay(300);
distanceLeft = lookLeft();
delay(300);
if (distance >= distanceLeft){
turnRight();
moveStop();
}
else{
turnLeft();
moveStop();
}
}
else{
moveForward();
}
distance = readPing();
}
int lookRight(){
servo_motor.write(0);
delay(500);
int distance = readPing();
delay(100);
servo_motor.write(90);
return distance;
}
int lookLeft(){
servo_motor.write(180);
delay(500);
int distance = readPing();
delay(100);
servo_motor.write(90);
return distance;
delay(100);
}
int readPing(){
delay(70);
int cm = sonar.ping_cm();
if (cm==0){
cm=250;
}
return cm;
}
void moveStop(){
digitalWrite(RightMotorForward, LOW);
digitalWrite(LeftMotorForward, LOW);
digitalWrite(RightMotorBackward, LOW);
digitalWrite(LeftMotorBackward, LOW);
}
void moveForward(){
digitalWrite(LeftMotorForward, LOW);
digitalWrite(RightMotorForward, LOW);
digitalWrite(LeftMotorBackward, HIGH);
digitalWrite(RightMotorBackward, HIGH);
}
void moveBackward(){
digitalWrite(LeftMotorBackward, LOW);
digitalWrite(RightMotorBackward, LOW);
digitalWrite(LeftMotorForward, HIGH);
digitalWrite(RightMotorForward, HIGH);
}
void turnRight(){
digitalWrite(LeftMotorForward, HIGH);
digitalWrite(RightMotorBackward, HIGH);
digitalWrite(LeftMotorBackward, LOW);
digitalWrite(RightMotorForward, LOW);
delay(500);
digitalWrite(LeftMotorForward, LOW);
digitalWrite(RightMotorForward, LOW);
digitalWrite(LeftMotorBackward, HIGH);
digitalWrite(RightMotorBackward, HIGH);
}
void turnLeft(){
digitalWrite(LeftMotorBackward, HIGH);
digitalWrite(RightMotorForward, HIGH);
digitalWrite(LeftMotorForward, LOW);
digitalWrite(RightMotorBackward, LOW);
delay(500);
digitalWrite(LeftMotorForward, LOW);
digitalWrite(RightMotorForward, LOW);
digitalWrite(LeftMotorBackward, HIGH);
digitalWrite(RightMotorBackward, HIGH);
}
Links For Circuit Components:
*Arduino Uno: Amazon.com
*L298N Motor: Driverhttps://www.amazon.com/Qunqi-Controller-Module-Stepper-Arduino/dp/B014KMHSW6
*Motors: Amazon.com
*Servo Motors: Amazon.com
*Ultrasonic Sensor: Amazon.com
Other Components:
*Ultrasonic Holder
*Universal Wheel (Caster Wheel)
- Alkaline AA Batteries
