About button

Projects Programming
1

hello guys, i need help.
i know it is a very basic and simple, but im totaly newbie about arduino coding.
what i want is when you press the button, the response on lcd is "button is: (pressed)" for 20 seconds before disappeared the word (pressed) but if you press button again it result to clear the pressed dispaly without waiting the 20 seconds countdown.

this is the example

#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd = LiquidCrystal_I2C(0x27, 16, 2);

int ButtonState;
int oldButtonState;
int ledpin2=A1;
int StartButt=7;



void setup(){
 lcd.init();
 lcd.backlight();

pinMode(StartButt,INPUT);
pinMode(ledpin2,OUTPUT);

}
void loop(){
  ButtonState=digitalRead(StartButt);
  lcd.setCursor(0,0);
 lcd.print("Button is:");


if(ButtonState!=oldButtonState){
if  (ButtonState == HIGH) {
lcd.setCursor(0,1);
 lcd.print("Pressed:");
 delay(20000); 
 lcd.clear(); 
}
}
else
if  (ButtonState == HIGH) {

 delay(100); 
 lcd.clear();
}
}

code.

2

To detect the button press event, you need to detect the state change. You can see a similar examples: button toggles relay, and then replace relay code by LCD code

3

where do you set oldButtonState?

do you always want to do

    lcd.print("Button is:");

regardless of whether there is a button press