Robot Car Part 2 Swing sensor for scan area

HC-SR04  to Arduino Nano

Vcc  >>  5 VccTrig  >>  D13Echo >>  D12Gnd  >>  Gnd

Servo wiring to Arduino Nano

Red      >> 5Vcc

Brown  >> GND

Orange >> pin 9 

Code

#include <Servo.h>

Servo myservo;

const int pingPin = 13;

int inPin = 12;

void setup() {

myservo.attach(9);

Serial.begin(9600);

}

void loop()

{

long duration, cm;

pinMode(pingPin, OUTPUT);

digitalWrite(pingPin, LOW);

delayMicroseconds(2);

digitalWrite(pingPin, HIGH);

delayMicroseconds(5);

digitalWrite(pingPin, LOW);

pinMode(inPin, INPUT);

duration = pulseIn(inPin, HIGH);

cm = microsecondsToCentimeters(duration);

 if (cm < 10) {  

    //  servo

        myservo.write(0); 

        delay(1000);      

        myservo.write(90); 

        delay(1000);      

        myservo.write(270); 

        delay(1000);    

  // end servo

}

  else {

    myservo.write(90);

  }

Serial.print(cm);

Serial.print("cm");

Serial.println();

delay(100);

}

long microsecondsToCentimeters(long microseconds)

{

// The speed of sound is 340 m/s or 29 microseconds per centimeter.

// The ping travels out and back, so to find the distance of the

// object we take half of the distance travelled.

return microseconds / 29 / 2;

}