#define PHASE_A 2
#define PHASE_B 3
#define PHASE_C 4

float frequency = 50.0;  // Гц
unsigned long phase_delay;

void setup() {
  pinMode(PHASE_A, OUTPUT);
  pinMode(PHASE_B, OUTPUT);
  pinMode(PHASE_C, OUTPUT);
  Serial.begin(9600);
 
  // Задержка между переключениями фаз
  phase_delay = (1000000 / (frequency * 6));  // микросекунды
}

void loop() {
  // Последовательное переключение фаз
  digitalWrite(PHASE_A, HIGH);
  digitalWrite(PHASE_B, LOW);
  digitalWrite(PHASE_C, LOW);
  delayMicroseconds(phase_delay);
 
  digitalWrite(PHASE_A, HIGH);
  digitalWrite(PHASE_B, HIGH);
  digitalWrite(PHASE_C, LOW);
  delayMicroseconds(phase_delay);
 
  digitalWrite(PHASE_A, LOW);
  digitalWrite(PHASE_B, HIGH);
  digitalWrite(PHASE_C, LOW);
  delayMicroseconds(phase_delay);
 
  digitalWrite(PHASE_A, LOW);
  digitalWrite(PHASE_B, HIGH);
  digitalWrite(PHASE_C, HIGH);
  delayMicroseconds(phase_delay);
 
  digitalWrite(PHASE_A, LOW);
  digitalWrite(PHASE_B, LOW);
  digitalWrite(PHASE_C, HIGH);
  delayMicroseconds(phase_delay);
 
  digitalWrite(PHASE_A, HIGH);
  digitalWrite(PHASE_B, LOW);
  digitalWrite(PHASE_C, HIGH);
  delayMicroseconds(phase_delay);
}