#include <LiquidCrystal_I2C.h> // include the library for the LCD screen
#include <IRremote.h> // include the library for IR remote and receiver 
#include <Servo.h> // Include Servo library

/*
Zainab Khan
PuttingitallTogether.ino
Thursday, April 10, 2025
This program uses an IR remote to turn a servo in increments of 15 degrees
it also has a Ultra Sonic Distance sensor that displays a different message
on an lcd screen depending on how far away an object is
*/

LiquidCrystal_I2C lcd (0x27, 16, 2); // I2C address is 0x27, 16 columns, 2 rows

int trigPin = 3; // trigPin is connected to pin 3, sends out signal 
int echoPin = 2; // echoPin is connected to pin 2, receives signal 

int servoPin = 9; // servo moter is connected to pin 9
Servo myServo; // Create a servo object to control the servo

int receiverPin = 12; // receiver is connected to pin 12
int commandValue = 0; // a  variable to hold the IR command number of the remote
IRrecv receiver(receiverPin); // creating a receiver object that is connected to receiverPin (pin 12)

int angle = 0; // variable to hold the angle of the servo

void setup() {
  pinMode(trigPin, OUTPUT); // setting trigPin as output
  pinMode(echoPin, INPUT); // setting echoPin as input

  lcd.init(); //initialize the lcd screen
  lcd.backlight(); // turn on the backlight 

  myServo.attach(servoPin); // Attach the servo motor to pin 9

  receiver.enableIRIn(); // enables IR receiver

  Serial.begin(9600);

} // end of void setup

void loop() {

  if (receiver.decode()){ // if remote is used
    translateIR(); // call translateIR function
    receiver.resume(); // read for signals again
  } // end of if 


  // start a new measurment 
  digitalWrite(trigPin, HIGH); // turns on sensor
  delayMicroseconds(10); // delay in microseconds 
  digitalWrite(trigPin, LOW); //turns off sensor
 
  int duration = pulseIn(echoPin, HIGH); // measuring the time it takes for the signal to return
  
  int centimeter = duration/58; // converts duration reading to centimeters

  lcd.setCursor (0,1); // move cursor to first column on bottom row 
  lcd.print(centimeter); 
  lcd.print(" cm away  ");

  delay(1000); // delay of 1 second 

  if (centimeter < 50){ // checks if centimeter is less than 50
    lcd.setCursor (0,0); // move cursor to first column on top row
    lcd.print("You're close!");
    lcd.print("                  ");
  } // end of if 

  else if (centimeter < 100){ // checks if centimeter is less than 100
    lcd.setCursor (0,0); // move cursor to first column on top row
    lcd.print("Medium distance");
    lcd.print("                  ");
  } // end of else if

  else { // checks if centimeter is any number that isnt less than 100 and less than 50 (any number greater than 100)
    lcd.setCursor (0,0); // move cursor to first column on top row
    lcd.print("More than 1m");
    lcd.print("                  ");
  } // end of else
  

} // end of void loop

int translateIR(){ // function for IR inputs and outputs
  commandValue = receiver.decodedIRData.command; // decode and store the command value
 
  if(commandValue == 144){ // checking if commandValue is equal to 144
     angle = angle + 15; // update angle to equal angle + 15
     myServo.write(angle); // Servo moves according to ubdated angle
     delay(15); // delay of 15 milliseconds 
  } // end of if for forward
 
  else if(commandValue == 224){ // checking if commandValue is equal to 224
     angle = angle - 15; // update angle to equal angle - 15
     myServo.write(angle); // Servo moves according to ubdated angle
     delay(15); // delay of 15 milliseconds 
  } // end of if for backward
  
  if(angle == 195){ // checking if angle is equal to 195
    angle = 180; // update angle to 180
    myServo.write(angle); // Servo moves according to ubdated angle
    delay(15);  // delay of 15 milliseconds 
  } // end of if for angle greater than 180
  
  if (angle == -15){ // checking if angle is equal to -15
    angle = 0; // update angle to 0
    myServo.write(angle); // Servo moves according to ubdated angle
    delay(15);  // delay of 15 milliseconds 
  } // end of if for angle less than 0

} // end of function translateIR