// Learn about the ESP32 WiFi simulation in
// https://docs.wokwi.com/guides/esp32-wifi

#include <Wire.h>
#include <LiquidCrystal_I2C.h>

// Set the LCD address (refer to the datasheet for your specific module)
LiquidCrystal_I2C lcd(0x27, 20, 4);
int counter = 0;

// External LED circuit to test code
int ledPin = 4;
const int channel = 0;
const int frequency = 1000;
const int resolution = 8;

// constants won't change. Used here to set pin numbers:
const int ledPin2 =  16;      // the number of the LED pin

// Variables will change:
int ledState = LOW;             // ledState used to set the LED
long previousMillis = 0;        // will store last time LED was updated

// the follow variables is a long because the time, measured in miliseconds,
// will quickly become a bigger number than can be stored in an int.
long interval = 1000;           // interval at which to blink (milliseconds)

void setup() {

  // set the digital pin as output:
  pinMode(ledPin2, OUTPUT);

  ledcSetup(channel, frequency, resolution);
  ledcAttachPin(ledPin, channel);


  // put your setup code here, to run once:
  lcd.init();  // Initialize the LCD - for WOKWI, this must be lcd.init()instead. For Arduino IDE, use lcd.begin.
  lcd.backlight();  // Turn on the LCD backlight
  lcd.setCursor(0, 0);  // Set the cursor to the first column of the first row
  lcd.print("Ken loves Lynda!!");  // Print a message
  lcd.setCursor(0, 1);  // Set the cursor to the first column of the first row
  lcd.print("He thinks about her");  // Print a message
  lcd.setCursor(0, 2);  // Set the cursor to the first column of the first row
  lcd.print("this many times/day:");  // Print a message

}

void loop() {
  // put your main code here, to run repeatedly:

  lcd.setCursor(0, 3);
  lcd.print("Count:");
  lcd.print(counter);
  delay(10);
  //lcd.clear();
  counter++;

  for (int fadeValue = 0; fadeValue <= 255; fadeValue += 5) {
    ledcWrite(channel, fadeValue);
    Serial.print("Fade Value:");
    Serial.println(fadeValue);
    delay(30);
  }


  for (int fadeValue = 255; fadeValue >= 0; fadeValue -= 5) {
    ledcWrite(channel, fadeValue);
    Serial.print("Fade Value:");
    Serial.println(fadeValue);
    delay(30);
  }


  // check to see if it's time to blink the LED; that is, if the 
  // difference between the current time and last time you blinked 
  // the LED is bigger than the interval at which you want to 
  // blink the LED.
  unsigned long currentMillis = millis();
 
  if(currentMillis - previousMillis > interval) {
    // save the last time you blinked the LED 
    previousMillis = currentMillis;   

    // if the LED is off turn it on and vice-versa:
    if (ledState == LOW)
      ledState = HIGH;
    else
      ledState = LOW;

    // set the LED with the ledState of the variable:
    digitalWrite(ledPin2, ledState);
  }


}