#include <Servo.h>
const int trigPin = 3;
const int echoPin = 2;
const int servoPin = 8;
const int segmentPins[] = {10, 9, 8, 6, 7, 11, 12}; // A-G сегменты
Servo myServo;
int freeSpaces;
unsigned long duration;
float distance;
void setup() {
  Serial.begin(9600);
  myServo.attach(servoPin);
  for (int i = 0; i < 7; i++) {
    pinMode(segmentPins[i], OUTPUT);
  }
  freeSpaces = random(1, 10);
  Serial.print("Свободные места: ");
  Serial.println(freeSpaces);
  displayNumber(freeSpaces);
  myServo.write(0); // Закрытый шлагбаум
}
void loop() {
  distance = measureDistance();
  if (distance < 30 && freeSpaces > 0) {
    openBarrier();
    freeSpaces--;
    displayNumber(freeSpaces);
    Serial.print("Свободные места: ");
    Serial.println(freeSpaces);
    delay(7000);
    closeBarrier();
  }
}
float measureDistance() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  return (duration * 0.034) / 2;
}
void displayNumber(int num) {
  bool segments[7] = {0};
  switch (num) {
    case 1: segments[1] = segments[2] = 1; break;
    case 2: segments[0] = segments[1] = segments[3] = segments[4] = segments[6] = 1; break;
    case 3: segments[0] = segments[1] = segments[2] = segments[3] = segments[6] = 1; break;
    case 4: segments[1] = segments[2] = segments[5] = segments[6] = 1; break;
    case 5: segments[0] = segments[2] = segments[3] = segments[5] = segments[6] = 1; break;
    case 6: segments[0] = segments[2] = segments[3] = segments[4] = segments[5] = segments[6] = 1; break;
    case 7: segments[0] = segments[1] = segments[2] = 1; break;
    case 8: segments[0] = segments[1] = segments[2] = segments[3] = segments[4] = segments[5] = segments[6] = 1; break;
    case 9: segments[0] = segments[1] = segments[2] = segments[3] = segments[5] = segments[6] = 1; break;
    default: break;
  }
  for (int i = 0; i < 7; i++) {
    digitalWrite(segmentPins[i], segments[i]);
  }
}
void openBarrier() {
  myServo.write(90);
}
void closeBarrier() {
  myServo.write(0);
}