#include <Wire.h>
#include <Adafruit_SSD1306.h>

// --- Настройка OLED ---
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET    -1
Adafruit_SSD1306 oled(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

float distance;

void setup() {
  Serial.begin(115200);

  if(!oled.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }

  oled.clearDisplay();
  oled.setTextSize(2);
  oled.setTextColor(SSD1306_WHITE);
  oled.setCursor(0,0);
  oled.println("Starting...");
  oled.display();

  randomSeed(analogRead(0)); // случайность
}

float readDistance() {
  distance = random(50, 151); // 50-150 см
  return distance;
}

void loop() {
  distance = readDistance();

  oled.clearDisplay();
  oled.setCursor(0,10);
  oled.println("Distance:");
  oled.setCursor(0,40);
  oled.print(distance);
  oled.println(" cm");
  oled.display();

  delay(500);
}