ساخت Lap Timer FPV با IR Sensor و Arduino: اندازه‌گیری دور پرواز (فارسی)

قطعات لازم (BOM)

کد Arduino Lap Timer

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

const int IR_PIN   = 2;  // INT0 — سنسور IR
const int BUZZ_PIN = 8;
const int RST_BTN  = 9;

volatile bool triggered = false;
unsigned long lastTrigger = 0;
unsigned long lapTime = 0;
unsigned long bestLap = 999999;
int lapCount = 0;
bool armed = false;

void IRAM_ATTR onIR() {
  if (millis() - lastTrigger > 1000) {  // debounce 1s
    triggered = true;
  }
}

void setup() {
  pinMode(IR_PIN, INPUT_PULLUP);
  pinMode(BUZZ_PIN, OUTPUT);
  pinMode(RST_BTN, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(IR_PIN), onIR, FALLING);
  lcd.init(); lcd.backlight();
  lcd.setCursor(0,0); lcd.print("FPV Lap Timer");
  lcd.setCursor(0,1); lcd.print("Ready!");
  delay(2000);
}

void loop() {
  if (digitalRead(RST_BTN) == LOW) {
    lapCount = 0; bestLap = 999999; armed = false;
    lcd.clear(); lcd.print("Reset!"); delay(1000);
  }

  if (triggered) {
    triggered = false;
    unsigned long now = millis();
    if (!armed) {
      armed = true; lastTrigger = now;
      lcd.clear(); lcd.print("GO!");
    } else {
      lapTime = now - lastTrigger;
      lastTrigger = now; lapCount++;
      if (lapTime < bestLap) bestLap = lapTime;
      tone(BUZZ_PIN, 2000, 200);
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("Lap"); lcd.print(lapCount);
      lcd.print(": "); lcd.print(lapTime/1000.0, 2); lcd.print("s");
      lcd.setCursor(0,1);
      lcd.print("Best:"); lcd.print(bestLap/1000.0, 2); lcd.print("s");
    }
  }
}

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منابع بیشتر

• آپارات: FPV Lap Timer فارسی
• Oscar Liang: Lap Timer FPV Guide