// Define the pins for the potentiometer and pushbutton:
const int potentiometerPin = A0;
const int pushButtonPin = 2; // Change this to the pin you're using for the pushbutton

// Variables to store sensor readings:
int sensorValue = 0; // Current reading from the potentiometer
int storedValues[3] = {0}; // Array to store readings from the potentiometer
int storedIndex = 0; // Index for storing readings sequentially

void setup() {
  // Initialize serial communication at 9600 bits per second:
  Serial.begin(9600);
  
  // Set the pushbutton pin as input with internal pull-up resistor:
  pinMode(pushButtonPin, INPUT_PULLUP);
}

void loop() {
  // Read the input on analog pin A0 (the connection to the potentiometer's wiper):
  sensorValue = analogRead(potentiometerPin);
  
  // Check if the pushbutton is pressed (since using pull-up, it's active LOW):
  if (digitalRead(pushButtonPin) == LOW) {
    // Store the current potentiometer reading if the pushbutton is pressed:
    storedValues[storedIndex] = sensorValue;
    delay(500); // Debouncing delay
    storedIndex = (storedIndex + 1) % 3; // Update the index, loop back to 0 if reaches 3
  }

  // Print out the current potentiometer reading:
  Serial.print("Current Reading: ");
  Serial.println(sensorValue);

  // Print out the stored values:
  Serial.print("Stored Values: ");
  for (int i = 0; i < 3; ++i) {
    Serial.print(storedValues[i]);
    Serial.print(" ");
  }
  Serial.println();
  
  // Wait for a bit to avoid spamming the serial monitor:
  delay(100);
}