Detect specific ble device around my Arduino nano 33 BLE

[painggg]

Hello,

I'm beginner in Arduino dev, but I'm a developer.

For a project, I'm trying to write some code for Arduino nano 33 BLE. I'd like to turn on some lights (LEDs) when a specific device is in range of the arduino. I'm trying to catch a device named w6-1 in my example.

Here is the code:

#include <ArduinoBLE.h>
#include <Adafruit_NeoPixel.h>

#define NUM_LEDS 60
#define DATA_PIN 2

Adafruit_NeoPixel strip = Adafruit_NeoPixel(NUM_LEDS, DATA_PIN, NEO_GRB + NEO_KHZ800);

void setup() {
  Serial.begin(9600);
  strip.begin();
  strip.show(); 

  if (!BLE.begin()) {
    Serial.println("Failed starting BLE!");
    while (1);
  }

  BLE.setLocalName("Nano33BLE");
  BLE.advertise();
  Serial.println("Bluetooth activated, waiting connection...");
}

void loop() {
  // Seach for w6-1 device
  BLE.scanForName("w6-1"); 

  // Check if a device is found
  BLEDevice device = BLE.available();
  if (device) {
    Serial.print("Device w6-1 detected at ");
    Serial.print(millis());
    Serial.println(" ms, turning on LEDs");
    lightLEDs(5); // Allumer les LEDs pendant 5 secondes
  }

  // Redémarrez le scan après avoir traité la détection
  BLE.stopScan();
}

void lightLEDs(int duration) {
  for (int i = 0; i < NUM_LEDS; i++) {
    strip.setPixelColor(i, strip.Color(255, 0, 0)); // Rouge
  }
  strip.show();
  delay(duration * 1000); // wait 'duration' seconds

  strip.clear();
  strip.show();
}

My problem is that it does not seems to be acurate. For example, my w6-1 device is on my desk beside the arduino. So I guess I'd be able to see the lights turn it on very often. But it is not the case. There are on at some times, but the time between 2 is not the same.

Here are some logs with time when the lights are on:

Device w6-1 detected at 14939 ms, turning on LEDs
Device w6-1 detected at 45939 ms, turning on LEDs
Device w6-1 detected at 93936 ms, turning on LEDs
Device w6-1 detected at 160937 ms, turning on LEDs
Device w6-1 detected at 186947 ms, turning on LEDs
Device w6-1 detected at 213951 ms, turning on LEDs
Device w6-1 detected at 281949 ms, turning on LEDs
Device w6-1 detected at 343958 ms, turning on LEDs
Device w6-1 detected at 559966 ms, turning on LEDs
Device w6-1 detected at 679973 ms, turning on LEDs
Device w6-1 detected at 699976 ms, turning on LEDs
Device w6-1 detected at 885982 ms, turning on LEDs
Device w6-1 detected at 981993 ms, turning on LEDs
Device w6-1 detected at 996991 ms, turning on LEDs
Device w6-1 detected at 1004991 ms, turning on LEDs
Device w6-1 detected at 1091000 ms, turning on LEDs
Device w6-1 detected at 1107991 ms, turning on LEDs
Device w6-1 detected at 1116993 ms, turning on LEDs
Device w6-1 detected at 1132999 ms, turning on LEDs
Device w6-1 detected at 1189995 ms, turning on LEDs
Device w6-1 detected at 1212997 ms, turning on LEDs
Device w6-1 detected at 1247002 ms, turning on LEDs
Device w6-1 detected at 1292002 ms, turning on LEDs

Do you have any ideas about what could be wrong with my code?