Simple Arduino IR trigger for cameras Sony a6300 a6200 etc

sonyIRTrigger.ino

#include <IRremote.hpp>

#define IR_LED_PIN 9
#define BUTTON_PIN 2

const unsigned long SONY_SHUTTER_CODE = 0xB4B8F;
const int BITS = 20;

unsigned long lastButtonPress = 0;
const unsigned long debounceDelay = 50; // 50 ms debounce

void setup() {
  IrSender.begin(IR_LED_PIN);
  pinMode(BUTTON_PIN, INPUT_PULLUP); // Use internal pull-up resistor
}

void loop() {
  // Read button (active LOW)
  if (digitalRead(BUTTON_PIN) == LOW) {
    unsigned long now = millis();
    if (now - lastButtonPress > debounceDelay) {
      triggerShutter();
      lastButtonPress = now;
    }
  }
}

void triggerShutter() {
  for (int i = 0; i < 3; i++) {
    IrSender.sendSony(SONY_SHUTTER_CODE, BITS);
    delay(40);
  }
}