Push Button Issues

Using Arduino Programming Questions
#1

So, im making a game, and i have a start button. the game is SUPPOSED to wait for you to press it, but then it skips it and continues. I havent finished the code, so im aware there is a loop in an awkward position, but IT BUGS THE HECK OUT OF ME! Ive tried 7 different designs of code. PLZ help.

Heres my code:

#include <LiquidCrystal.h>

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

void setup() {
lcd.begin(16, 2);
lcd.clear();
pinMode(A0, OUTPUT);
pinMode(A2, OUTPUT);
pinMode(A4, OUTPUT);
pinMode(A1, INPUT);
pinMode(A3, INPUT);
pinMode(A5, INPUT);
}

void loop() {
lcd.setCursor(0, 0);
lcd.print(“H”);
delay(200);
lcd.print(“e”);
delay(200);
lcd.print(“l”);
delay(200);
lcd.print(“l”);
delay(200);
lcd.print(“o”);
delay(200);
lcd.print("!");
delay(3000);
lcd.clear();
lcd.print(“P”);
delay(200);
lcd.print(“r”);
delay(200);
lcd.print(“e”);
delay(200);
lcd.print(“s”);
delay(200);
lcd.print(“s”);
delay(200);
lcd.print(" ");
lcd.print(“Y”);
delay(200);
lcd.print(“e”);
delay(200);
lcd.print(“l”);
delay(200);
lcd.print(“l”);
delay(200);
lcd.print(“o”);
delay(200);
lcd.print(“w”);
while (digitalRead(A5) == LOW) {
}
lcd.clear();
}

#2

So you want to wait for the button to be pressed? Go low?
THEN clear the screen?

  while (digitalRead(A5) == LOW) {
    //Do nothing
  }
  lcd.clear();

Or more simply (but slightly harder to understand for a beginner)...

  while (digitalRead(A5) == LOW);
  lcd.clear();

Note the ; is very important and the end of the while. It terminates the while when you don't have a set of braces { } to indicate what to repeat.

Crucially it is NOT the same as...

  while (digitalRead(A5) == LOW)
  lcd.clear();

Which, reading between the lines, I suspect you may have tried at some point.

Learn to use tags around your code when posting!

#3

Hi,
Welcome to the forum.

Please read the post at the start of any forum , entitled "How to use this Forum".
OR
http://forum.arduino.cc/index.php/topic,148850.0.html.
Then look down to item #7 about how to post your code.
It will be formatted in a scrolling window that makes it easier to read.

Can you please post a copy of your circuit, in CAD or a picture of a hand drawn circuit in jpg, png?

How have you got your button wired, do you have pullup or pulldown resistors?

Thanks.. Tom.. :slight_smile:

#4

As Tom says:

TomGeorge:
Hi,
Welcome to the forum.

Please read the post at the start of any forum , entitled "How to use this Forum".
OR
http://forum.arduino.cc/index.php/topic,148850.0.html.
Then look down to item #7 about how to post your code.
It will be formatted in a scrolling window that makes it easier to read.

Can you please post a copy of your circuit, in CAD or a picture of a hand drawn circuit in jpg, png?

How have you got your button wired, do you have pullup or pulldown resistors?

Thanks.. Tom.. :slight_smile:

Configure your inputs like this:

pinMode(A5, INPUT_PULLUP);
#5