//1+2+3+4+5+6+7+8
#include <Wire.h>   
#include <LiquidCrystal_I2C.h> 
LiquidCrystal_I2C lcd(0x27, 20, 4);
const int ledPin = 10;
const int ledPinPwm = 9;
const int trigPin = 7;               
const int echoPin = 6; 
const float distanceMin = 100;
float distance;

float measureDistance(int trigPin, int echoPin){
  digitalWrite(trigPin, HIGH);                 
  delayMicroseconds(10);                        
  digitalWrite(trigPin, LOW);                   

  long impulseTime = pulseIn(echoPin, HIGH);        
  return impulseTime/58.0;                     
}

void setup() {
  Serial.begin(9600);
  pinMode(ledPin, OUTPUT);
  pinMode(ledPinPwm, OUTPUT);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  
  lcd.begin(16, 2);
  lcd.clear();
  lcd.home();
  lcd.print("Lucja Waligora");
  delay(2000);
}

void showLcd(){ 
  lcd.setCursor(0,0);
  lcd.print("Odl: ");
  lcd.print(distance);
  lcd.print("   ");
  
  String text = distance < distanceMin ? "Za blisko" : "         ";
  lcd.setCursor(0,1);
  lcd.print(text);
}

void showSerial(){
  Serial.print("Odleglosc: ");
  Serial.println(distance);
}

void loop() {
  distance = measureDistance(trigPin, echoPin);
  showSerial();
  showLcd();
  
  if(distance < distanceMin){
  	digitalWrite(ledPin, HIGH);
    analogWrite(ledPinPwm, 128);
  }
  else{
    digitalWrite(ledPin, LOW);
    analogWrite(ledPinPwm, 0);
  } 
  delay(20);
}