Sensor Verileriyle Adımlı Sayıcı: Accelerometer Okuma ve Filtreleme

1import android.hardware.Sensor
2import android.hardware.SensorEvent
3import android.hardware.SensorEventListener
4import android.hardware.SensorManager
5import kotlin.math.sqrt
6
7class StepCounter(private val onStepDetected: () -> Unit): SensorEventListener {
8private var lastMagnitude = 0f
9private var stepCount = 0
10private val threshold = 25f // Adım eşiği
11private val buffer = mutableListOf<Float>()
12private val bufferSize = 5
13
14override fun onSensorChanged(event: SensorEvent) {
15if (event.sensor.type == Sensor.TYPE_ACCELEROMETER) {
16val x = event.values[0]
17val y = event.values[1]
18val z = event.values[2]
19
20// Bileşke ivme hesapla
21val magnitude = sqrt(x*x + y*y + z*z)
22
23// Hareketli ortalama ile filtreleme
24buffer.add(magnitude)
25if (buffer.size > bufferSize) buffer.removeAt(0)
26val smoothed = buffer.average().toFloat()
27
28// Tepe tespiti: değer eşikten büyük ve önceki değerden fazla
29if (smoothed > threshold && smoothed > lastMagnitude) {
30stepCount++
31onStepDetected()
32}
33lastMagnitude = smoothed
34}
35}
36
37override fun onAccuracyChanged(sensor: Sensor?, accuracy: Int) {}
38
39fun getStepCount() = stepCount
40}

1import android.content.Context
2import android.hardware.SensorManager
3import androidx.appcompat.app.AppCompatActivity
4import android.os.Bundle
5import android.widget.TextView
6
7class MainActivity: AppCompatActivity() {
8private lateinit var sensorManager: SensorManager
9private lateinit var stepCounter: StepCounter
10private lateinit var stepText: TextView
11
12override fun onCreate(savedInstanceState: Bundle?) {
13super.onCreate(savedInstanceState)
14setContentView(R.layout.activity_main)
15
16stepText = findViewById(R.id.step_text)
17sensorManager = getSystemService(Context.SENSOR_SERVICE) as SensorManager
18
19stepCounter = StepCounter {
20stepText.text = "Adımlar: ${stepCounter.getStepCount()}"
21}
22
23val accelerometer = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER)
24sensorManager.registerListener(stepCounter, accelerometer, SensorManager.SENSOR_DELAY_NORMAL)
25}
26
27override fun onDestroy() {
28super.onDestroy()
29sensorManager.unregisterListener(stepCounter)
30}
31}