Code Source

#include <Adafruit_CircuitPlayground.h>
/*
VR and Reality Bridge
Andrew Atkin
GDES-3015-001 Wearable Computing
OCAD University
Created on March 16th 2017
Based on:
Carolina Uscategui - https://gist.github.com/CarolinaUscategui/6d99255a2ce6d6c9d69153587622021d
GDES 3015 - Wearable Computing

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https://www.arduino.cc/en/Tutorial/Ping
I put all the ultrasonic distance code into a single function called ultrasoundPing so I can call it more easily in my main for loop
By calling ultrasoundPing at the beginning of every loop I no longer need to wait for an entire LED sequence to fire before the delay
changes. Instead, it is more responsive now and the delay can change within a sequence.
*/

// defines pins numbers
const int trigPin = 12; //part of the sensor
const int echoPin = 13;//part of sensor
const int vibratePin = 11;//

// defines variables
long duration;
int distance;
int safetyDistance;

void setup() {

//
pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output; the sound and light
pinMode(echoPin, INPUT); // Sets the echoPin as an Input; measurement
pinMode(vibratePin, OUTPUT);//Vibration Motor
Serial.begin(9600); // Starts the serial communication 9.6
}

void loop() {
// Clears the trigPin
digitalWrite(trigPin, LOW);
delayMicroseconds(2);

// Sets the trigPin on HIGH state for 10 micro seconds
digitalWrite(trigPin, HIGH);
delayMicroseconds(10); //literally no delay too keep it constant
digitalWrite(trigPin, LOW);

// Reads the echoPin, returns the sound wave travel time in microseconds
duration = pulseIn(echoPin, HIGH);

// Calculating the distance
distance = duration * 0.034 / 2; 

//the speed of sound is 340m/s , but the echo pin needs to bouse off that sound wave so /2 double the distace

safetyDistance = distance;
if (safetyDistance <= 5) {
digitalWrite(vibratePin, HIGH);//if there is motion produce a output (turn on)

}
else {
digitalWrite(vibratePin, LOW); // or else of nothing is occuring be at a state of nothing
}

// Prints the distance on the Serial Monitor
Serial.print("Distance: ");
Serial.println(distance);
}