final project

const int Red_f_pin = 12;

const int Red_s_pin = 11;

const int Red_t_pin = 10;

const int trigPin = 7;

const int echoPin = 6;

const int Buzzer = 5;

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

 

void setup() {

  // put your setup code here, to run once:

 pinMode(Red_f_pin, OUTPUT);

 pinMode(Red_s_pin, OUTPUT);

 pinMode(Red_t_pin, OUTPUT);

 //pinMode(Buzzer, OUTPUT);

 

 lcd.init();

 lcd.backlight();

 

 Serial.begin(9600);

 pinMode(trigPin,OUTPUT);

 pinMode(echoPin,INPUT);

}

void loop() {

long duration, cm;

 

  digitalWrite(trigPin, LOW);

  delayMicroseconds(2);

  digitalWrite(trigPin, HIGH);

  delayMicroseconds(10);

  digitalWrite(trigPin, LOW);

 

  duration = pulseIn(echoPin, HIGH);

 

  cm = microsecondsToCentimeters(duration);

 

  //Serial.print(cm);

  //Serial.print("cm");

  //Serial.println();

  lcd.clear();

  lcd.setCursor(0,0);

  lcd.print(cm);

  lcd.setCursor(0,1);

  lcd.print("cm");

  delay (300);

 

  if(cm<10){

    digitalWrite(Red_f_pin, HIGH);

    digitalWrite(Red_s_pin, HIGH);

    digitalWrite(Red_t_pin, HIGH);

    //digitalWrite(Bazzer, HIGH);

    tone(Buzzer, 97.999, 500);

    delay(200);

    tone(Buzzer, 500.407, 500);

    delay(500);

 

  }else{

    digitalWrite(Red_f_pin, LOW);

    digitalWrite(Red_s_pin, LOW);

    digitalWrite(Red_t_pin, LOW);

    digitalWrite(Buzzer, LOW);    

  }

}

 

int microsecondsToInches(long microseconds) {

  return microseconds / 74 / 2;

}

 

long microsecondsToCentimeters(long microseconds) {

  return microseconds / 29 / 2;

 

}