gistfile1.txt

#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;

unsigned long interval=2000; // the time we need to wait
unsigned long startMillis=0; // millis() returns an unsigned long.
const unsigned long period = 1000;  //the value is a number of millisecond
const unsigned long runInterval;  //the value is a number of millisecond
 
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

startMillis = millis();

}


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 

unsigned long currentMillis = millis(); // grab current time

// check the time elapsed against our interval - if less, run the code, if more, move
// back to default lights. 

 if (distance < 40) {

  currentMillis = millis();  //get the current "time" (actually the number of milliseconds since the program started)

  currentMillis + period == runInterval; 
  
  if (currentMillis < runInterval) {  //test whether the period has elapsed

        fill_solid(leds, NUM_LEDS, CRGB::Blue); 
        FastLED.show();   
        startMillis = currentMillis; 

      }
 }
 else { 
  
  fill_solid(leds, NUM_LEDS, CRGB::Black);

  FastLED.show(); 
  
 }
 }