// Define the Arduino pins for controlling the 6 transistors (2 per phase)
#define U1 3   // High side of phase U
#define U2 4   // Low side of phase U
#define V1 5   // High side of phase V
#define V2 6   // Low side of phase V
#define W1 9   // High side of phase W
#define W2 10  // Low side of phase W

// Define the PWM frequency range
#define MAX_FREQUENCY 1000 // Max PWM frequency (Hz)
#define MIN_FREQUENCY 10   // Min PWM frequency (Hz)

int potPin = A0;  // Pin for the potentiometer (used for speed control)
int potValue = 0;  // Variable to hold the potentiometer value
unsigned long lastTime = 0;
unsigned long period = 1000;  // Default period (1 second)

void setup() {
  // Set the transistor pins as OUTPUT
  pinMode(U1, OUTPUT);
  pinMode(U2, OUTPUT);
  pinMode(V1, OUTPUT);
  pinMode(V2, OUTPUT);
  pinMode(W1, OUTPUT);
  pinMode(W2, OUTPUT);
  
  // Initialize serial communication for debugging
  Serial.begin(9600);
}

void loop() {
  // Read the potentiometer value (0 to 1023)
  potValue = analogRead(potPin);
  
  // Map the potentiometer value to a frequency range (MIN_FREQUENCY to MAX_FREQUENCY)
  int frequency = map(potValue, 0, 1023, MIN_FREQUENCY, MAX_FREQUENCY);
  
  // Calculate the period based on the frequency (period = 1/frequency)
  period = 1000 / frequency;  // Convert frequency to period in milliseconds

  // Print the frequency for debugging
  Serial.print("Frequency: ");
  Serial.println(frequency);
  
  // Generate the 3-phase control signal
  unsigned long currentTime = millis();
  
  if (currentTime - lastTime >= period) {
    lastTime = currentTime;

    // First phase: U
    digitalWrite(U1, HIGH);  // High side of phase U
    digitalWrite(U2, LOW);   // Low side of phase U

    digitalWrite(V1, LOW);   // Low side of phase V
    digitalWrite(V2, HIGH);  // High side of phase V

    digitalWrite(W1, LOW);   // Low side of phase W
    digitalWrite(W2, HIGH);  // High side of phase W

    delay(period / 3);  // Wait for 1/3rd of the period for the next phase
    
    // Second phase: U
    digitalWrite(U1, LOW);   // Low side of phase U
    digitalWrite(U2, HIGH);  // High side of phase U

    digitalWrite(V1, HIGH);  // High side of phase V
    digitalWrite(V2, LOW);   // Low side of phase V

    digitalWrite(W1, LOW);   // Low side of phase W
    digitalWrite(W2, HIGH);  // High side of phase W

    delay(period / 3);  // Wait for 1/3rd of the period for the next phase

    // Third phase: U
    digitalWrite(U1, LOW);   // Low side of phase U
    digitalWrite(U2, HIGH);  // High side of phase U

    digitalWrite(V1, LOW);   // Low side of phase V
    digitalWrite(V2, HIGH);  // High side of phase V

    digitalWrite(W1, HIGH);  // High side of phase W
    digitalWrite(W2, LOW);   // Low side of phase W

    delay(period / 3);  // Wait for 1/3rd of the period for the next phase
  }
}