// Charlieplex 30 LED - 4 Ring Test Code
// 6 pins control 30 LEDs

const int numPins = 6;
const int pins[numPins] = {2, 3, 4, 5, 6, 7}; // P1-P6

// LED matrix: [anode_pin, cathode_pin]
const int ledMap[30][2] = {
  {0, 1},  // LED1:  P1->P2
  {0, 2},  // LED2:  P1->P3
  {0, 3},  // LED3:  P1->P4
  {0, 4},  // LED4:  P1->P5
  {0, 5},  // LED5:  P1->P6
  {1, 0},  // LED6:  P2->P1
  {1, 2},  // LED7:  P2->P3
  {1, 3},  // LED8:  P2->P4
  {1, 4},  // LED9:  P2->P5
  {1, 5},  // LED10: P2->P6
  {2, 0},  // LED11: P3->P1
  {2, 1},  // LED12: P3->P2
  {2, 3},  // LED13: P3->P4
  {2, 4},  // LED14: P3->P5
  {2, 5},  // LED15: P3->P6
  {3, 0},  // LED16: P4->P1
  {3, 1},  // LED17: P4->P2
  {3, 2},  // LED18: P4->P3
  {3, 4},  // LED19: P4->P5
  {3, 5},  // LED20: P4->P6
  {4, 0},  // LED21: P5->P1
  {4, 1},  // LED22: P5->P2
  {4, 2},  // LED23: P5->P3
  {4, 3},  // LED24: P5->P4
  {4, 5},  // LED25: P5->P6
  {5, 0},  // LED26: P6->P1
  {5, 1},  // LED27: P6->P2
  {5, 2},  // LED28: P6->P3
  {5, 3},  // LED29: P6->P4
  {5, 4}   // LED30: P6->P5
};

void setup() {
  // Initialize all pins as inputs (high impedance)
  for (int i = 0; i < numPins; i++) {
    pinMode(pins[i], INPUT);
  }
}

void loop() {
  // Test 1: Light each LED one at a time
  for (int led = 0; led < 30; led++) {
    lightLED(led);
    delay(100);
  }
  
  delay(500);
  
  // Test 2: Light all LEDs in each ring
  // Ring 1 (LED1-3)
  for (int i = 0; i < 200; i++) {
    for (int led = 0; led < 3; led++) {
      lightLED(led);
      delayMicroseconds(500);
    }
  }
  
  // Ring 2 (LED4-9)
  for (int i = 0; i < 200; i++) {
    for (int led = 3; led < 9; led++) {
      lightLED(led);
      delayMicroseconds(500);
    }
  }
  
  // Ring 3 (LED10-18)
  for (int i = 0; i < 200; i++) {
    for (int led = 9; led < 18; led++) {
      lightLED(led);
      delayMicroseconds(500);
    }
  }
  
  // Ring 4 (LED19-30)
  for (int i = 0; i < 200; i++) {
    for (int led = 18; led < 30; led++) {
      lightLED(led);
      delayMicroseconds(500);
    }
  }
  
  delay(500);
  
  // Test 3: Spinning effect
  for (int round = 0; round < 10; round++) {
    for (int led = 0; led < 30; led++) {
      lightLED(led);
      delay(30);
    }
  }
  
  delay(1000);
}

void lightLED(int led) {
  // Turn all pins to input (high impedance)
  for (int i = 0; i < numPins; i++) {
    pinMode(pins[i], INPUT);
  }
  
  // Set anode HIGH and cathode LOW
  int anodePin = ledMap[led][0];
  int cathodePin = ledMap[led][1];
  
  pinMode(pins[anodePin], OUTPUT);
  pinMode(pins[cathodePin], OUTPUT);
  digitalWrite(pins[anodePin], HIGH);
  digitalWrite(pins[cathodePin], LOW);
}