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[Reply #15 on:]

am i correct like this? but why it not goes to state 1. remain at state zero after i push down button.

Code:

/////////////////////////////////////////////////////////////  
  if (currentState == 0 && buttonPressed == DOWN_BUTTON_MENU)
  {
    (currentState == 1);
    lcd.clear();
    lcd.setCursor(0,0);                       // set lcd.setCursor (column,row)
    lcd.print("Add Fingerprint");
  }
  
  else if (currentState == 1 && buttonPressed == DOWN_BUTTON_MENU)
  {
    (currentState == 2);
    lcd.clear();
    lcd.setCursor(0,0);                       // set lcd.setCursor (column,row)
    lcd.print("Delete");
    lcd.setCursor(0,1);                       // set lcd.setCursor (column,row)
    lcd.print("Fingerprint");
  }
  
  else if (currentState == 2 && buttonPressed == DOWN_BUTTON_MENU)
  {
    (currentState == 3);
    lcd.clear();
    lcd.setCursor(0,0);                       // set lcd.setCursor (column,row)
    lcd.print("Search");
    lcd.setCursor(0,1);                       // set lcd.setCursor (column,row)
    lcd.print("Fingerprint");
  }
  
  else if (currentState == 3 && buttonPressed == DOWN_BUTTON_MENU)
  {
    (currentState == 4);
    lcd.clear();
    lcd.setCursor(0,0);                       // set lcd.setCursor (column,row)
    lcd.print("Empty Database");
  }
  
  else if (currentState == 4 && buttonPressed == DOWN_BUTTON_MENU)
  {
    //(currentState == 0);
    lcd.clear();
    lcd.setCursor(0,0);                       // set lcd.setCursor (column,row)
    lcd.print("Search Database");
  }
///////////////////////////////////////////////////////////////////////////////

[Reply #16 on:]

Thanks,
Useful lessons for me too !

[Reply #17 on:]

(currentState == 1); does nothing.  Actually not quite true, but not what you want
currentState = 1; sets the currentState variable to 1

== compares 2 things
= sets the variable on the left to the value on the right.

[Reply #18 on:]

(currentState == 1); does nothing.  Actually not quite true, but not what you want
currentState = 1; sets the currentState variable to 1

== compares 2 things
= sets the variable on the left to the value on the right.

actually not quite true? i think my coding is like this. my initial state is zero by the way. currentState = 0; sets the currentState variable to 1

[Reply #19 on:]

In your code you have: (currentState == 1);

That won't do as you are intending. Assuming you want currentState to change to 1 you need to change it to: currentState = 1;

[Reply #20 on:]

In your code you have: (currentState == 1);

That won't do as you are intending. Assuming you want currentState to change to 1 you need to change it to: currentState = 1;

haha. thank you for that. now it is working. thanks buddy.