// FOR ARDUINO NANO
#define PIN_OUTPUT 3 // Pin for Output Signal
#define LED_CONTROL 5 // Pin for LED, to show info what controller is doing
#define PIN_BUTTON 2 //Button for simple controlling

/*
   PWM-Pins on Arduino Nano:
   3,9,10,11 with 490 Hz
   5,6 with 980 Hz
   Change PWM frequency: https://www.etechnophiles.com/how-to-change-the-pwm-frequency-of-arduino-nano/
*/


// FOR DIGISPARK
//#define PIN_OUTPUT 3 // Pin for Output Signal
//#define LED_CONTROL 0 // Pin for LED, to show info what controller is doing
//#define PIN_BUTTON 2 //Button for simple controlling

/*
   Digispark: https://digistump.com/wiki/digispark/tutorials/connecting
*/

void setup() {
  delay(2000);
  // Set PinModes

  // PWM FREQUENCY FOR ARDUINO NANO ONLY!!!!!
  // PWM FREQUENCY FOR PIN 3 & 11
  // TCCR2B = TCCR2B & B11111000 | B00000001; // for PWM frequency of 31372.55 Hz
  // TCCR2B = TCCR2B & B11111000 | B00000010; // for PWM frequency of 3921.16 Hz
  // TCCR2B = TCCR2B & B11111000 | B00000011; // for PWM frequency of 980.39 Hz
  // TCCR2B = TCCR2B & B11111000 | B00000100; // for PWM frequency of 490.20 Hz (The DEFAULT)
  // TCCR2B = TCCR2B & B11111000 | B00000101; // for PWM frequency of 245.10 Hz
  // TCCR2B = TCCR2B & B11111000 | B00000110; // for PWM frequency of 122.55 Hz
  // TCCR2B = TCCR2B & B11111000 | B00000111; // for PWM frequency of 30.64 Hz

  // PWM FREQUENCY FOR PIN 5 & 6
  // TCCR0B = TCCR0B & B11111000 | B00000001; // for PWM frequency of 62500.00 Hz
  // TCCR0B = TCCR0B & B11111000 | B00000010; // for PWM frequency of 7812.50 Hz
  // TCCR0B = TCCR0B & B11111000 | B00000011; // for PWM frequency of 976.56 Hz (The DEFAULT)
  // TCCR0B = TCCR0B & B11111000 | B00000100; // for PWM frequency of 244.14 Hz
  // TCCR0B = TCCR0B & B11111000 | B00000101; // for PWM frequency of 61.04 Hz

  // PWM FREQUENCY FOR PIN 9 & 10
  // TCCR1B = TCCR1B & B11111000 | B00000001; // for PWM frequency of 31372.55 Hz
  // TCCR1B = TCCR1B & B11111000 | B00000010; // for PWM frequency of 3921.16 Hz
  // TCCR1B = TCCR1B & B11111000 | B00000011; // for PWM frequency of 490.20 Hz (The DEFAULT)
  // TCCR1B = TCCR1B & B11111000 | B00000100; // for PWM frequency of 122.55 Hz
  // TCCR1B = TCCR1B & B11111000 | B00000101; // for PWM frequency of 30.64 Hz

  // DIGISPARK DEFAULT PWM FREQUENXY IS
  // PIN0 504
  // PIN1 504
  // PIN4 1007 (USB), can NOT be used

  pinMode(PIN_OUTPUT, OUTPUT);
  pinMode(LED_CONTROL, OUTPUT);
  pinMode(PIN_BUTTON, INPUT);

  // Check Button is not pressed
  while (digitalRead(PIN_BUTTON) != LOW) {
    blink_control(2, 250);
    delay(250);
  }
  delay(500);
  blink_control(2, 1000);
  delay(2000);

  // Set pin states
  digitalWrite(PIN_OUTPUT, LOW);
  digitalWrite(LED_CONTROL, LOW);

  // Initialize Mode START
  blink_control(3, 300);
  delay(1000);
  // Test output function
  doSomething();

  // Initialize Mode END
  delay(500);
  digitalWrite(LED_CONTROL, HIGH);
  delay(1000);
  digitalWrite(LED_CONTROL, LOW);
  delay(200);
}

uint8_t modulator = 10; // 1 out of '15' will trigger
uint16_t timer = 200; // delay for random generator

// mean trigger time = "modulator * timer / 1000"

void loop() {
  if ((random(modulator) + 1) % modulator == 0) {
    doSomething();
  } else {
    delay(timer);
  }
  while(digitalRead(PIN_BUTTON) == HIGH) {
    doSomething();
  }
}


/*          CUSTOM FUNCTIONS         */
void doSomething() {
  // blink_control(1, 300);
  stroboPop();
}

void stroboPop() {
  uint16_t stroboFlashCount = random(7,13);
  
  uint16_t lowHz = uint16_t(1000/15);       // 66 ms | 15 Hz
  uint16_t highHz = uint16_t(1000/25);      // 40 ms | 25 Hz
  uint16_t dtime = random(highHz, lowHz);   // Random dtime between 15 & 25 Hz
  
  for(uint8_t n = 0; n < stroboFlashCount; n++) {
    digitalWrite(PIN_OUTPUT, HIGH);
    delay(uint16_t(dtime*0.1));
    digitalWrite(PIN_OUTPUT, LOW);
    delay(uint16_t(dtime*0.9));    
  }
}

void carHorn() {

}

void blink_control(uint8_t count, uint16_t dtime) {
  for (uint8_t n = 0; n < count; n++) {
    digitalWrite(LED_CONTROL, HIGH);
    delay(dtime / 2);
    digitalWrite(LED_CONTROL, LOW);
    delay(dtime / 2);
  }
}