Added a new Example : Servo Stop

examples/ServoStop/ServoStop.ino

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+/*
+  Set servo position to 0 when the ultrasonic sensor detects any object closer
+  than 17cm. Otherwise, set servo position to 90.
+
+
+  You can see the detailed description at https://github.com/arduino-libraries/Servo/blob/master/examples/ServoStop/ServoStop.md  
+
+  The circuit:
+  - Ultrasonic Trig pin to digital pin 3 on arduino
+  - Ultrasonic Echo pin to digital pin 2 on arduino
+  - Servo pin to digital pin 4 on arduino
+
+  Example originally added on 21-03-2020
+  by Madhur Dixit https://github.com/Chester-King
+
+*/
+
+
+#include <Servo.h>
+byte trigPin = 3;
+byte echoPin = 2;
+byte servoPin = 4;
+
+Servo myservo;  // create servo object to control a servo
+int pos = 0; // variable to store the servo position
+void setup() {
+  Serial.begin(9600); //opens serial port, sets data rate to 9600 bps
+  pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
+  pinMode(echoPin, INPUT); // Sets the echoPin as an Input
+  myservo.attach(servoPin);  // attaches the servo on pin 4 to the Servo object
+}
+
+void loop() {
+  unsigned long duration;
+  unsigned int distance;
+
+  // Sets the trigPin on HIGH state for 10 micro seconds
+  digitalWrite(trigPin, HIGH);
+  delayMicroseconds(10);
+  digitalWrite(trigPin, LOW);
+
+  // Reads the echoPin, returns the sound wave travel time in microseconds
+  duration = pulseIn(echoPin, HIGH);
+
+  // Calculating the distance
+  distance = (duration / 2) / 29.1;
+
+  // Prints the distance on the Serial Monitor
+  Serial.print("Distance: ");
+  Serial.print(distance);
+  Serial.println(" cm");
+
+  // Checks if the distance between the object is less than 17cm
+  if (distance < 17) {
+    myservo.write(0);   // if the distance between the object is less than 17cm then tell servo to go to position 0
+  } else {
+    myservo.write(90);   // if the distance between the object is greater than or equal to 17cm then tell servo to go to position 90
+  }
+}

examples/ServoStop/ServoStop.md

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+# ServoStop
+
+## Sketch Objective
+
+Set servo position to 0 when the ultrasonic sensor detects any object closer
+than 17cm. Otherwise, set servo position to 90.
+by Madhur Dixit https://github.com/Chester-King
+
+## Sketch Details and Working
+
+**Connections:**
+
+- Trig Pin on Ultrasonic sensor to GPIO 3 on Arduino
+- Echo Pin on Ultrasonic sensor to GPIO 2 on Arduino
+- Servo to GPIO 4 on Arduino
+- Connect the Vcc of the Ultrasonic and Servo to 5V of Arduino
+- Connect the Gnd of the Ultrasonic and Servo to Gnd of Arduino
+- Upload the code to Arduino
+
+## Result
+
+Whenever any Object comes in 17cm Proximity of the Ultrasonic sensor the servo will set to the position 0 until the object leaves the ultrasonic sensor proximity.
+
+## Required Circuit
+
+You can see the required Circuit [here](https://github.com/arduino-libraries/Servo/blob/master/examples/ServoStop/ServoStop.png)