Car in Action - Part 2

Car in Action - Part 1

Servo Motors in Robotics

Servo Motor and Ultrasonic Sensor in Action - Toll Gate Project

Arduino Code:

#include <Servo.h>

int redLed = 13;

int triggerPin = 3;

int echoPin = 4;

int servoPin1 = 7;

int servoPin2 = 10;

int yellowLed = 2;

Servo myServo1;

Servo myServo2;

void setup() {

  // put your setup code here, to run once:

  Serial.begin(9600);

  pinMode(redLed, OUTPUT);

  pinMode(yellowLed, OUTPUT);

  pinMode(triggerPin, OUTPUT);

  pinMode(echoPin, INPUT);

  myServo1.attach(servoPin1);

  myServo2.attach(servoPin2);

}

void loop() {

  // put your main code here, to run repeatedly:

  long duration, distance;

  digitalWrite(triggerPin, LOW);

  delayMicroseconds(2);

  digitalWrite(triggerPin, HIGH);

  delayMicroseconds(10);

  digitalWrite(triggerPin, LOW);

  

  duration = pulseIn(echoPin, HIGH);

  distance = (duration/2) / 29.1;

  Serial.print("Distance: ");

  Serial.println(distance);

  if (distance < 20) {

    digitalWrite(redLed,LOW);

    digitalWrite(yellowLed, HIGH);

    myServo1.write(90);

    myServo2.write(90);

   } 

  else {

    digitalWrite(redLed,HIGH);

    digitalWrite(yellowLed, LOW);

    myServo1.write(0);

    myServo2.write(180);

  }

}

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Servo Motor and Arduino Basics

Arduino Sketch:

#include <Servo.h>

Servo myServo;

int servoPin = 9;

// the setup routine runs once when you press reset:
void setup() {
  // initialize the digital pin as an output.
  myServo.attach(servoPin);
}

// the loop routine runs over and over again forever:
void loop() {
  //Moving forward in the increments of 45 degrees, upto 180 degree
  myServo.write(45);
  delay(1000);
  myServo.write(90);
  delay(1000);
  myServo.write(135);
  delay(1000);
  myServo.write(180);
  delay(1000);

  //Moving backward in the deccrements of 45 degrees, upto 0 degree
  myServo.write(135);
  delay(1000);
  myServo.write(90);
  delay(1000);
  myServo.write(45);
  delay(1000);
  myServo.write(0);
  delay(1000);

}

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How to use Ultrasonic Sensor?

Arduino Sketch Code is as below:

// Pin 13 has an LED connected on most Arduino boards.
// give it a name:
int sig = 7;
int led = 3;

// the setup routine runs once when you press reset:
void setup() {
  // initialize the digital pin as an output.
  Serial.begin(9600);
  pinMode(led, OUTPUT);
}

// the loop routine runs over and over again forever:
void loop() {
  pinMode(sig, OUTPUT);
  digitalWrite(sig, LOW);   // turn the LED on (HIGH is the voltage level)
  delayMicroseconds(2);               // wait for a second
  digitalWrite(sig, HIGH);    // turn the LED off by making the voltage LOW
  delayMicroseconds(5);               // wait for a second
  digitalWrite(sig, LOW);

  pinMode(sig, INPUT);
  long duration = pulseIn(sig, HIGH);
  int distance = duration / 74 / 2;

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

  if (distance <50){
    tone(8, 1000, 500);
    digitalWrite(led, HIGH);
    delay(100);
  }

  digitalWrite(led, LOW);
  delay(100);

}

Note: I am using circuits.io for simulating the task,