// === Eduardo Avila ====
// === Replace this text with your Name ====
// Module #6 project

//setup to use LCD
#include <LiquidCrystal_I2C.h> //lcd
LiquidCrystal_I2C lcd(0x27,16,2); 

//North South LEDs pin configuration
const int red_LED1 = 14;  // The red LED1 is wired to ESP32 board pin GPIO14
const int yellow_LED1 =12;  // The yellow LED1 is wired to ESP32 board pin GPIO12
const int green_LED1 = 13; // The green LED1 is wired to ESP32 board pin GPIO13

//East West LEDs pin configuration
const int red_LED2 = 25;  // The red LED2 is wired to Mega board pin GPIO25
const int yellow_LED2 = 26; // The yellow LED2 is wired to Mega board pin GPIO 26
const int green_LED2 = 27; // The green LED2 is wired to Mega board pin GPIO 27

//setup crosswalk value and button variables
const int Xw_button = 19; //Cross Walk button
bool Xw_value = false;  //flag

//setup buzzer pin assignment
const int bzr=32; // GPIO32 to connect the Buzzer

//Define what happens when interrupt is activated
void IRAM_ATTR crosswalkB() 
{ // Cross Walk button interrupt handler
     Xw_value = true;
}

// the setup function runs once when you press reset or power the board 
void setup() 
{
//setup crosswalk button as input and attach the Interrupt
pinMode(Xw_button, INPUT_PULLUP); // 0=pressed, 1 = unpressed button 
attachInterrupt(Xw_button, crosswalkB, RISING);

//setup serial speed
Serial.begin(115200);

lcd.init(); // initialize the lcd lcd.backlight();
lcd.setCursor(0,0); // 
lcd.print(" === CEIS114 ===");

//buzzer set to output
pinMode(bzr,OUTPUT);
tone(bzr, 0);

// NS pin direction set to output
pinMode(red_LED1, OUTPUT); // initialize digital pin 14 (Red LED1) as an output.
pinMode(yellow_LED1, OUTPUT); // initialize digital pin 12 (yellow LED1) as an output.
pinMode(green_LED1, OUTPUT);  // initialize digital pin 13 (green LED1) as an output.
//EW pin direction set to output 
pinMode(red_LED2, OUTPUT); // initialize digital pin 25(Red LED2) as an output.
pinMode(yellow_LED2, OUTPUT); // initialize digital pin 26 (yellow LED2) as an output.
pinMode(green_LED2, OUTPUT); // initialize digital pin 27 (green LED2) as an output.
}// end of setup

// this loop function runs over and over again forever – keeps the main program always running
void loop() 
{//while Crosswalk button pressed
while (Xw_value == true )
{ // if crosswalk button (X-button) pressed

delay(500);
digitalWrite(yellow_LED1 , LOW);  // This should turn off the YELLOW LED1
digitalWrite(green_LED1, LOW);  // This should turn off the GREEN LED1
digitalWrite(yellow_LED2 , LOW); // This should turn off the YELLOW LED2
digitalWrite(green_LED2, LOW);  // This should turn off the GREEN LED2
 
for (int i=10; i>0; i--)
{ 
//message to Serial Monitor
Serial.print(" Count = "); 
Serial.print(i);
Serial.println(" == Walk == ");

//message to LCD
lcd.setCursor(0,1); // set the cursor to column 1, line 2
lcd.print(" == Walk == "); //  Walk  characters to the LCD.
lcd.print(i); // Print the count to the LCD
lcd.print(" ="); //  Walk  characters to the LCD.

//flash led during walk countdown
digitalWrite(red_LED1, HIGH);  // This should turn on the RED LED1 
digitalWrite(red_LED2, HIGH);  // This should turn on the RED LED2 
tone(bzr, 200);
delay(500);  //wait 0.5 seconds

digitalWrite(red_LED1, LOW);  // This should turn off the RED LED1 
digitalWrite(red_LED2, LOW);  // This should turn off the RED LED2 
tone(bzr, 250); 
delay(500);  //wait 0.5 seconds
} // End of counter
tone(bzr, 0);
//reset before leaving the loop
Xw_value = false;

} // End of while Crosswalk Button pressed


//while Crosswalk button is not pressed
while (Xw_value == false )
{
lcd.setCursor(0,1); // set the cursor to column 1, line 2
lcd.print(" = Do Not Walk ="); // Do Not Walk characters to the LCD.

Serial.println(" == Do Not Walk == ");

// The next three lines of code turn on the red LED1 
digitalWrite(red_LED1, HIGH); // This should turn on the RED LED1
digitalWrite(yellow_LED1 , LOW);  // This should turn off the YELLOW LED1
digitalWrite(green_LED1, LOW);  // This should turn off the GREEN LED1
delay(1000); //Extended time for Red light#1 before the Green of the other side turns ON

// The next three lines of code turn on the red LED2 
digitalWrite(red_LED2, LOW);  // This should turn off the RED LED2
digitalWrite(yellow_LED2 , LOW); // This should turn off the YELLOW LED2
digitalWrite(green_LED2, HIGH); // This should turn on the GREEN LED2
delay(1000);  // wait for 1 second

// The next three lines of code turn on the red LED1
digitalWrite(red_LED1, HIGH); // This should turn on the RED LED1
digitalWrite(yellow_LED1 , LOW);  // This should turn off the YELLOW LED1
digitalWrite(green_LED1, LOW);  // This should turn off the GREEN LED1

// The next three lines of code turn on the red LED2
 
digitalWrite(red_LED2, LOW);  // This should turn off the RED LED2
digitalWrite(yellow_LED2 , HIGH); // This should turn on the YELLOW LED2
digitalWrite(green_LED2, LOW);  // This should turn off the GREEN LED2
delay(1000);  // wait for 1 second

// The next three lines of code turn on the red LED2
digitalWrite(red_LED2, HIGH); // This should turn on the RED LED2
digitalWrite(yellow_LED2 , LOW); // This should turn off the YELLOW LED2
digitalWrite(green_LED2, LOW);  // This should turn off the GREEN LED2
delay(1000); //Extended time for Red light#2 before the Green of the other side turns 

// The next three lines of code turn on the yellow LED1
digitalWrite(red_LED1, LOW);  // This should turn off the RED LED1
digitalWrite(yellow_LED1 , LOW);  // This should turn off the YELLOW LED1
digitalWrite(green_LED1, HIGH); // This should turn on the GREEN LED1
delay(1000);  // wait for 1 second

// The next three lines of code turn on the yellow LED1 
digitalWrite(red_LED1, LOW);  // This should turn off the RED LED1
digitalWrite(yellow_LED1 , HIGH); // This should turn on the YELLOW LED1
digitalWrite(green_LED1, LOW);  // This should turn off the GREEN LED1

// The next three lines of code turn on the red LED2
digitalWrite(red_LED2, HIGH); // This should turn on the RED LED2
digitalWrite(yellow_LED2 , LOW); // This should turn off the YELLOW LED2
digitalWrite(green_LED2, LOW);  // This should turn off the GREEN LED2
delay(1000);  // wait for 1 second
}//End of While NOT
}//End of program