Making Magic with Easy Arduino Project using LED Strip and Ultrasonic Sensor

Items Needed:

1. WS2812 Addressable RGB Strip LED – 1 Meter
2. HC-SR04 – Ultrasonic Sensor
3. Arduino UNO with Cable
4. BreadBoard
5. Jumper Wires Male to Male

Code:

#include <FastLED.h>
#define LED_PIN     7
#define NUM_LEDS    30

#define T1 10 // pin 10 is trigger for sensor 1
#define E1 9 //// pin 9 is echo for sensor 1

int val=0;
CRGB leds[NUM_LEDS];

long DistanceSensor (int, int); //trigger echo

void setup() {

//delay(10000);
Serial.begin(9600);
   pinMode(E1, INPUT); //echo sensor 1
   pinMode(T1, OUTPUT); //trigger sensor 1
  
  FastLED.addLeds<WS2812, LED_PIN, GRB>(leds, NUM_LEDS);
  
  for(int i=0;i<30; i++)
  {
      leds[i] = CRGB(0, 0, 0);
    
  }



  FastLED.show();
}
void loop()
{
  
  long distance = DistanceSensor(T1, E1);
  if(distance < 7)
  {
    TurnONOFFLEDS(0);
  }
  else{
    int number = (distance - 7)/3 + 1;
    TurnONOFFLEDS(number);
  }
}


void TurnONOFFLEDS(int number)
{
   for(int i=0;i<number; i++)
   {
      leds[i] = CRGB(0, 0, 255);
    
   }
   FastLED.show();
   for(int i=number;i<30; i++)
   {
      leds[i] = CRGB(0, 0, 0);
    
   }
   FastLED.show();
}


long microsecondsToCentimeters(long microseconds) {

  return microseconds / 29 / 2;
}

long DistanceSensor (int trigger, int echo)
{
  long duration, cm;

    digitalWrite(trigger, HIGH);
    delayMicroseconds(5);
    digitalWrite(trigger, LOW);
    delayMicroseconds(5);

 
  duration = pulseIn(echo, HIGH);

  
  cm = microsecondsToCentimeters(duration);

  /*Serial.print(cm);
  Serial.print("cm");
  Serial.println();

  return cm;
}