circuit-
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Hc-sr04 vcc pin conect- Arduino pin 5v+
Hc-sr04 trigger pin -Arduino pin13
Hc-sr04 echo pin -Arduino pin12
Gdn-Gnd
servo yallow wire connect -Arduino Pwm pin9
servo Red wire connrect -Arduino pin 5v+
servo Black or Brown wire connect -Gnd
Programming-
#include <Servo.h>
Servo myservo;
const int pingPin = 13;//pin13 से ultrasonic sound sensor की triggers pin को connect करें
int inPin = 12;//pin 12 से echo pin connect
int Limit = 10;
int pos=0;
void setup() {
Serial.begin(9600); // initialize serial communication
myservo.attach(9);//Pwm pin9 से servo का yallow wire connect
}
void loop()
{
//raw duration in milliseconds, cm is the
//converted amount into a distance
long duration, cm;
//sending the signal, starting with LOW for a clean signal
digitalWrite(pingPin, LOW);
delayMicroseconds(2);
digitalWrite(pingPin, HIGH);
delayMicroseconds(5);
digitalWrite(pingPin, LOW);
//setting up the input pin, and receiving the duration in
//microseconds for the sound to bounce off the object infront
pinMode(inPin, INPUT);
duration = pulseIn(inPin, HIGH);
// convert the time into a distance
cm = microsecondsToCentimeters(duration);
//printing the current readings to ther serial monitor
Serial.print(cm);
Serial.print(“cm”);
Serial.println();
//यदि ultrasound ping sensor के सामने कोई बस्तु की distance limit=10cm से कम है
//तो condition true होगी और servo motor statement से रन होगी
if (cm > Limit)
{
for(pos = 0; pos <= 180; pos += 1)
{
myservo.write(pos);
delay(15);
}
for(pos = 180; pos>=0; pos-=1)
{
myservo.write(pos);
delay(15);
}
}
else
{
}
delay(100);
}
long microsecondsToCentimeters(long microseconds)
{
//ultrasound wave की speed 340 m/s or 29 microseconds/centimeter है
return microseconds / 29 / 2;
}