#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 10, 9, 8, 7);
#define PIN_TRIG 3
#define PIN_ECHO 2

const int led = 4;
const int tonepin = 5;

// #define pirout 6
// int pirState = LOW;
// int val = 0;

void setup() {
  lcd.begin(16, 2);
  Serial.begin(115200);
  pinMode(PIN_TRIG, OUTPUT);
  pinMode(PIN_ECHO, INPUT);

  pinMode(led, OUTPUT);

  // pinMode(pirout, INPUT);
  lcd.print("Hello World!");
}

void loop() {
  // you can now interact with the LCD, e.g.:
  delay(2000);
  lcd.clear();
  // Start a new measurement:
  digitalWrite(PIN_TRIG, HIGH);
  delayMicroseconds(10);
  digitalWrite(PIN_TRIG, LOW);

  // Read the result:
  int duration = pulseIn(PIN_ECHO, HIGH);
  int distancecm = duration / 58;
  int distancein = duration / 148;

  Serial.print("Distance in CM: ");
  Serial.println(distancecm);
  Serial.print("Distance in inches: ");
  Serial.println(distancein);

  lcd.print("Distance(cm):");
  lcd.setCursor(0, 2);
  lcd.print(distancecm);
  if (distancecm <= 20) {
    tone(tonepin, 262, 250); // Plays 262Hz tone for 0.250 seconds
    digitalWrite(led, HIGH);
    delay(500);
    digitalWrite(led, LOW);
    delay(500);
    tone(tonepin, 262, 250); // Plays 262Hz tone for 0.250 seconds
    digitalWrite(led, HIGH);
    delay(500);
    digitalWrite(led, LOW);
    delay(1000);
  }
  // val = digitalRead(pirout);  // read input value
  // if (val == HIGH) {            // check if the input is HIGH
  //   digitalWrite(led, HIGH);  // turn LED ON
  //   if (pirState == LOW) {
  //     // we have just turned on
  //     Serial.println("Motion detected!");
  //     tone(tonepin, 262, 250);
  //     delay(1000);
  //     tone(tonepin, 262, 250);
  //     // We only want to print on the output change, not state
  //     pirState = HIGH;
  //   }
  // } else {
  //   digitalWrite(led, LOW); // turn LED OFF
  //   if (pirState == HIGH) {
  //     // we have just turned of
  //     Serial.println("Motion ended!");
  //     // We only want to print on the output change, not state
  //     pirState = LOW;
  //   }
  // }

}