New to arduino - 4 button in correct order to display on LCD

Projects General Guidance
1

Hello,

I just recently learned of Arduino and I want to tackle a project. That being said, I've read the basics and am a novice coder but I want to dive into this. I am trying to do a few things.

4 buttons need to be input in the proper sequence to trigger an event - display a 4 digit number on LCD
If the sequence is input incorrect trigger a different event - display on the LCD a different message

With each button press that is correct I want an LED to stay lit
If an incorrect button is pushed LED's turn off

I want the code entering process to reset itself if nothing happens for 10 seconds

Lastly I want the display to shut off after 1 minute

So far here is what I have for code, this is for 1 button working it probably isnt even simplified the best way possible, layout to follow........

Using an ELEGOO UNO R3

int ledPin = 5;
int switchPin = 2;
boolean lastButton = LOW;
boolean ledOn = false;
boolean currentButton = LOW;

// put your setup code here, to run once:

void setup()
{

//initialize pins as outputs
pinMode(switchPin, INPUT);
pinMode(ledPin, OUTPUT);
}

boolean debounce(boolean last)
{
boolean current = digitalRead(switchPin);
if (last != current)
{
delay(5);
current = digitalRead(switchPin);
}
return current;
}
// put your main code here, to run repeatedly:
void loop()
{
currentButton = debounce(lastButton);
if (lastButton == LOW && currentButton == HIGH)
{
ledOn = !ledOn;
//!inverts the last call so if it was true now false
}
lastButton = currentButton;
digitalWrite(ledPin, ledOn);
}

4 button schem.jpg
4 button schem.jpg1086×674 156 KB

2

Please read the forum sticky post to find out how to post your code correctly, and edit your post above to fix it.

3

Also look into the finite state machine, as that's what you need.

Basically, if the button order is 1, 2, 3, 4, you'd get something like this:

unsigned int lastPressed = 0;

void loop() {
  if (digitalRead(button1) == LOW) { // You probably need to debounce your buttons or it's registered a second time as false press - you may simply use lastPressed for this and ignore presses for 25 ms or so.
    if (programState == 0) programState = 1 // Next step.
    else programState = 0; // wrong button; back to zero.
    lastPressed = millis(); // record when we had a button pressed.
  }
  if (digitalRead(button2) == LOW) {
    if (programState == 1) programState = 2 // Next step.
    else programState = 0; // wrong button; back to zero.
    lastPressed = millis(); // record when we had a button pressed.
  }
  // Same for the other buttons.

  if (millis() - lastPressed) > 10000 programSate = 0; // reset after 10 seconds of no button presses.


  // Set LEDs based on the stage you're in.

}