#define NUM_PINS_1_TO_7 7
#define NUM_PINS_8_TO_11 4

const int pins_1_to_7[NUM_PINS_1_TO_7] = {4, 0, 2, 15, 13, 12, 14};
const int pins_8_to_11[NUM_PINS_8_TO_11] = {27, 26, 25, 33};

const int freq_pin_1_to_7 = 285714; // Hz
const int freq_pin_8_to_11 = 1000000; // Hz

void setup() {
  // Set pin modes
  for (int i = 0; i < NUM_PINS_1_TO_7; ++i) {
    pinMode(pins_1_to_7[i], OUTPUT);
  }
  for (int i = 0; i < NUM_PINS_8_TO_11; ++i) {
    pinMode(pins_8_to_11[i], OUTPUT);
  }
}

void loop() {
  // Delay calculations
  int delay_pin_1_to_7 = 1000000 / freq_pin_1_to_7; // in microseconds
  int delay_pin_8_to_11 = 1000000 / freq_pin_8_to_11; // in microseconds
  
  // Loop through pins 1 to 7
  for (int i = 0; i < NUM_PINS_1_TO_7; ++i) {
    // Activate current pin
    digitalWrite(pins_1_to_7[i], HIGH);
    delayMicroseconds(delay_pin_1_to_7); // Delay for 1 cycle
    
    // Deactivate all other pins
    for (int j = 0; j < NUM_PINS_1_TO_7; ++j) {
      if (j != i) {
        digitalWrite(pins_1_to_7[j], LOW);
      }
    }
    
    // Delay for pin 1 to 7 frequency
    delayMicroseconds(delay_pin_1_to_7);
  }
  
  // Loop through pins 8 to 11
  for (int i = 0; i < NUM_PINS_8_TO_11; ++i) {
    // Activate current pin
    digitalWrite(pins_8_to_11[i], HIGH);
    delayMicroseconds(delay_pin_8_to_11); // Delay for 1 cycle
    
    // Deactivate all other pins
    for (int j = 0; j < NUM_PINS_8_TO_11; ++j) {
      if (j != i) {
        digitalWrite(pins_8_to_11[j], LOW);
      }
    }
    
    // Delay for pin 8 to 11 frequency
    delayMicroseconds(delay_pin_8_to_11);
  }
}