Prime Finder rev_01

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    - Project: Prime Finder
    - Source Code NOT compiled for: ESP32 DevKit V1
    - Source Code created on: 2025-12-08 15:16:38

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
    /* Turn on an light emitting diode led when pushing a */
    /* pressbuttom. */
/****** END SYSTEM REQUIREMENTS *****/


/* START CODE */

/****** DEFINITION OF LIBRARIES ******/
#include <EasyButton.h>

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);

/***** DEFINITION OF DIGITAL INPUT PINS *****/
const uint8_t mybutton_PushButton_PIN_D4 = 4;
const uint8_t ledPin = 2; // Arduino pin for the LED

/****** DEFINITION OF LIBRARIES CLASS INSTANCES*****/

unsigned long startTime;
unsigned long duration = 30000; // 30 seconds
unsigned long currentNumber = 2;
unsigned long maxPrime = 2;

// Instance of the button.
EasyButton myButton(mybutton_PushButton_PIN_D4);

// Pin configuration for LED
void setup() {
  Serial.begin(115200);
  startTime = millis();
  pinMode(mybutton_PushButton_PIN_D4, INPUT_PULLUP);
  pinMode(ledPin, OUTPUT);
  myButton.begin();
  // Attach callback for button press
  myButton.onPressed([](){ digitalWrite(ledPin, HIGH); }); // Turn on LED on press
  // Attach callback for button release
  myButton.onReleased([](){ digitalWrite(ledPin, LOW); }); // Turn off LED on release
}

// Prime number calculation and LED control loop
void loop() {
  // Turn LED on when button is pressed
  myButton.read();

  if (millis() - startTime < duration) {
    if (isPrime(currentNumber)) {
      maxPrime = currentNumber;
    }
    currentNumber++;
  } else {
    Serial.print("Highest prime found in 30 seconds: ");
    Serial.println(maxPrime);
    while (true) {} // Stop the program
  }
}

// Check if number is prime
bool isPrime(unsigned long n) {
  if (n < 2) return false;
  if (n % 2 == 0 && n != 2) return false;
  for (unsigned long i = 3; i * i <= n; i += 2) {
    if (n % i == 0) return false;
  }
  return true;
}

/* END CODE */