Toggle state w button while ignoring other code...

Projects Programming
1

I have an LCD using I2C. I have the text turning on and off every 1.5 seconds or so. I wanted to connect a momentary button that would toggle the backlight when pressed and keep it on for 3 seconds after being pressed and then shut off again. I want this to be independent of the message turning on and off on the screen.

I have read through the blink without delay stuff hoping it would help me but I don't know how to incorporate a button in that context, if that's even remotely close to what I should be thinking. I just started w arduino so I'm clueless. Here is my code. I know it's not going to work correctly this way but I just don't know how to fix it.

#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
/**********************************************************/
// initialize the library with the numbers of the interface pins
LiquidCrystal_I2C lcd(0x27,16,2); // set the LCD address to 0x27 for a 16 chars and 2 line display

const int buttonPin = 2;
int buttonState = 0;
/*********************************************************/

void setup()
{
  lcd.init(); //initialize the lcd
  //lcd.backlight(); //open the backlight
  pinMode(buttonPin, INPUT);
}


void loop()
{
  buttonState = digitalRead(buttonPin);
  if (buttonState == HIGH)  {
   lcd.backlight();
   delay(3000);
  }
  
  else{
    lcd.noBacklight();
  }
    
  lcd.setCursor(3,0);
  lcd.print("Welcome To");
  lcd.setCursor(4,1);
  lcd.print("Room 222");
  delay(1500);
  lcd.clear();
  delay(1200);
}
2

I have read through the blink without delay stuff hoping it would help me but I don't know how to incorporate a button in that context,

BWoD is the way to go.

Save the millis() value at the time that the start action (button press) happens. Then, each time through loop(), check whether the required wait period has elapsed by subtracting the start time from the millis() value now. If the period has elapsed then act accordingly. If not, then go round loop() again, perhaps taking other actions and/or reading inputs, but don't block the free running of loop().

Have a look at Using millis() for timing. A beginners guide for some extended examples.