Distance sensor - minimum reading

distance_sensor_minimum_read

#include <FastLED.h>

#define NUM_LEDS 200
#define datapin 6
#define LED_TYPE WS2811

CRGB leds[NUM_LEDS];

const int trigPin = 10;
const int echoPin = 11;
// defines variables
long duration;
int distance;

int oldValue;
int lightingVal;

void setup() {

  FastLED.addLeds<WS2811, datapin>(leds, NUM_LEDS);

  pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
  pinMode(echoPin, INPUT); // Sets the echoPin as an Input
  Serial.begin(9600); // Starts the serial communication

}


void loop() {

  //distance code

  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  // 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 * 0.034 / 2;
  // Prints the distance on the Serial Monitor
  //Serial.print("Distance: ");
  //Serial.println(distance);


  // main code


  EVERY_N_MILLISECONDS (50)
  {
    distance = oldValue;

  }

  if (distance < oldValue) {

    distance = lightingVal;

  }

  else {

    lightingVal = oldValue;
    Serial.println(lightingVal); 

    }
}