#include <SoftwareSerial.h>
#define RX 5
#define TX 6

SoftwareSerial mySerial(5,6); // rx, tx
#define echoPin 2
#define trigPin 3 
#define LEDPin 13 

int maximumRange = 200; 
int minimumRange = 0; 
long duration, distance; 

int redPin = 8;
int greenPin = 9;
int bluePin = 10;

void setup() {
 mySerial.begin (9600);
 pinMode(trigPin, OUTPUT);
 pinMode(echoPin, INPUT);
 pinMode(LEDPin, OUTPUT); 
 
 pinMode(redPin, OUTPUT);
 pinMode(greenPin, OUTPUT);
 pinMode(bluePin, OUTPUT);
    
}

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

 digitalWrite(trigPin, HIGH);
 delayMicroseconds(10); 
 
 digitalWrite(trigPin, LOW);
 duration = pulseIn(echoPin, HIGH);
 
 distance = duration/58.2;
 
 if(distance>=60){  
 setColor(255, 0, 0);  // red
  delay(100);
 }
  if (distance<60 && distance>=50){
  setColor(0, 255, 0);  // green
  delay(100);
  }
  if (distance<50 && distance>=40){
  setColor(0, 0, 255);  // blue
  delay(100);
  }
  if (distance<40 && distance>=30){
  setColor(255, 255, 0);  // yellow
  delay(100);
  }
  if (distance<30 && distance>=20){
  setColor(80, 0, 80);  // purple
  delay(100);
  }
  if (distance<20 && distance>=0){
  setColor(0, 255, 255);  // aqua
  delay(100);
  }
 
 else {
 digitalWrite(LEDPin, LOW); 
 }
  mySerial.println(distance);
 delay(100);
}
void setColor(int red, int green, int blue)
{
analogWrite(redPin, red);
analogWrite(greenPin, green);
analogWrite(bluePin, blue);
}