Between reading, looking at others' work and asking for help... I'm hoping to take this very simply application to the next step.

I am currently able to capture each number as I dial them with an old rotary phone dial. Each value is printed to serial and, when #5 is dialed, an LED is lit until a new number is dialed.

What I don't know how to do is to have it listen for a combination of numbers and take an action. Let's say I want to dial 34 and light a light but not have it light for just 3 or 4. In fact, I'd really like to be able to register a set of numbers, like a phone directory, for different actions but am trying to take a baby steps iterative approach.

I'm not trying to make it overly complex so I can learn along the way. Thank you if you have any help or feedback. Most of this is based on an Arduino rotary dial tutorial.

int needToPrint = 0;
int count;
int dialPin = 2;
int lastState = LOW;
int trueState = LOW;
long lastStateChangeTime = 0;
int cleared = 0;
int ledPin = 12; // LED pin for indication

// Constants
const int dialHasFinishedRotatingAfterMs = 100;
const int debounceDelay = 20;

void setup() {
  Serial.begin(9600);
  pinMode(dialPin, INPUT);
  pinMode(ledPin, OUTPUT);
}

void loop() {
  int reading = digitalRead(dialPin);

  if ((millis() - lastStateChangeTime) > dialHasFinishedRotatingAfterMs) {
    if (needToPrint) {
      if (count >= 1 && count <= 10) {
        Serial.print("Number ");
        Serial.println(count);
      }

      // Check if the detected number is 5
      if (count == 5) {
        digitalWrite(ledPin, HIGH); // Turn on the LED on pin 12
      } else {
        digitalWrite(ledPin, LOW); // Turn off the LED on pin 12 for other numbers
      }

      needToPrint = 0;
      count = 0;
      cleared = 0;
    }
  }

  if (reading != lastState) {
    lastStateChangeTime = millis();
  }

  if ((millis() - lastStateChangeTime) > debounceDelay) {
    if (reading != trueState) {
      trueState = reading;
      if (trueState == HIGH) {
        count  ;
        needToPrint = 1;
      }
    }
  }

  lastState = reading;
}

​