fix+UX: BLE 중복수신 수정, peak detection 개선, UI 대폭 정리

BLE:
- GATT 다중연결 race condition 수정 (reconnectConnecting 플래그)
- onCharacteristicChanged API 레벨 분기 (dual callback 방지)
- DeviceScan: isConnected → isServiceReady 전환 (서비스 준비 후 화면전환)
- Placement: mpa/maa 500ms 딜레이 (power on 대기)
- Disconnect & Unbond 기능 추가 (msr? + removeBond + 저장정보 삭제)
- autoConnect 삭제 (HomeView)

Algorithm:
- 후위벽 피크 >= threshold 조건 추가 (false positive 차단)
- low-echo 분석범위 80샘플 제한 (뒤쪽 노이즈 무시)
- urineLen: post-ant-1 → post-ant 수정
- Placement: UrinAI fallback 제거 (PiezoEchoAnalyzer만 사용)
- 기기 프리셋 autoDetect index 7→8 수정 (VBT26040Nxx)
- dps 기본값 1.771 → 1.968

UI:
- 도넛차트: Home버튼 삭제, Auto/Catheter count/History 삭제
- 3버튼 레이아웃 (Catheterize/Auto/Spot)
- 배터리 아이콘 (60+초록/30+주황/빨강) + 설정 톱니바퀴 분리
- SensorSelect/Consent 페이지 스킵
- 온보딩: VesiScan-Basic, NIRS 페이지 삭제
- MaxVolume: Step 표시 삭제, mL 오른쪽 배치
- BackHandler 전체 재정리 (자연스러운 뒤로가기)
- BLE 신호 기준 완화 (Good≥-80, Fair≥-90)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/src/main/java/com/example/medilightv2android/AppState.kt

@@ -49,7 +49,6 @@ class AppState(private val context: Context) {
 
         currentScreen = when {
             !storage.hasCompletedOnboarding -> AppScreen.ONBOARDING
-            !storage.hasConsented -> AppScreen.CONSENT
             !storage.isRegistered -> AppScreen.REGISTRATION
             !storage.hasPin -> AppScreen.PIN_SETUP
             else -> AppScreen.PIN_ENTRY
@@ -58,7 +57,8 @@ class AppState(private val context: Context) {
 
     fun completeOnboarding() {
         storage.hasCompletedOnboarding = true
-        currentScreen = AppScreen.CONSENT
+        storage.hasConsented = true
+        currentScreen = AppScreen.REGISTRATION
     }
 
     fun completeConsent() {
@@ -93,7 +93,9 @@ class AppState(private val context: Context) {
     }
 
     fun startFromHome() {
-        currentScreen = AppScreen.SENSOR_SELECT
+        sensorMode = SensorMode.PIEZO
+        storage.sensorMode = SensorMode.PIEZO
+        currentScreen = AppScreen.DEVICE_SCAN
     }
 
     fun selectSensor(mode: SensorMode) {
@@ -103,7 +105,7 @@ class AppState(private val context: Context) {
     }
 
     fun backToSensorSelect() {
-        currentScreen = AppScreen.SENSOR_SELECT
+        currentScreen = AppScreen.HOME
     }
 
     fun deviceConnected() {

app/src/main/java/com/example/medilightv2android/MainActivity.kt

@@ -61,19 +61,25 @@ fun MedilightApp(modifier: Modifier = Modifier) {
     val context = LocalContext.current
     val appState = remember { AppState(context) }
 
-    // Android 뒤로가기 = 앱 내 뒤로가기
+    // Android 뒤로가기 = 바로 전 화면
-    BackHandler(enabled = appState.currentScreen != AppScreen.HOME) {
+    BackHandler(enabled = appState.currentScreen != AppScreen.HOME
+            && appState.currentScreen != AppScreen.PIN_ENTRY) {
         when (appState.currentScreen) {
-            AppScreen.SENSOR_SELECT -> appState.currentScreen = AppScreen.HOME
+            // 메인 플로우: Home → DeviceScan → Personalization → Placement → Monitoring
-            AppScreen.DEVICE_SCAN -> appState.currentScreen = AppScreen.SENSOR_SELECT
+            AppScreen.DEVICE_SCAN -> appState.currentScreen = AppScreen.HOME
             AppScreen.PIEZO_PERSONALIZATION -> appState.currentScreen = AppScreen.DEVICE_SCAN
-            AppScreen.PLACEMENT_GUIDE -> appState.goHome()
+            AppScreen.PLACEMENT_GUIDE -> appState.currentScreen = AppScreen.PIEZO_PERSONALIZATION
             AppScreen.PIEZO_MONITORING -> appState.currentScreen = AppScreen.PLACEMENT_GUIDE
-            AppScreen.VIVAMYO_MONITORING -> appState.goHome()
+            // 모니터링 하위 화면 → 모니터링
             AppScreen.MEASUREMENT_HISTORY -> appState.currentScreen = AppScreen.PIEZO_MONITORING
             AppScreen.VOIDING_DIARY -> appState.currentScreen = AppScreen.PIEZO_MONITORING
             AppScreen.REMINDER_SETTINGS -> appState.currentScreen = AppScreen.PIEZO_MONITORING
             AppScreen.URINE_CAMERA -> appState.currentScreen = AppScreen.PIEZO_MONITORING
+            // 기타
+            AppScreen.SENSOR_SELECT -> appState.currentScreen = AppScreen.HOME
+            AppScreen.VIVAMYO_MONITORING -> appState.currentScreen = AppScreen.HOME
+            AppScreen.NIRS_CALIBRATION -> appState.currentScreen = AppScreen.DEVICE_SCAN
+            // 온보딩/등록 (뒤로가기 막지 않되 Home으로)
             else -> appState.currentScreen = AppScreen.HOME
         }
     }

app/src/main/java/com/example/medilightv2android/ble/BleManager.kt

@@ -166,6 +166,12 @@ class BleManager private constructor(private val context: Context) {
     // Connection
     fun connect(bleDevice: BleDevice) {
         stopScan()
+        cancelAutoReconnect()
+        reconnectScanCallback?.let { cb ->
+            try { bluetoothAdapter?.bluetoothLeScanner?.stopScan(cb) } catch (_: Exception) {}
+            reconnectScanCallback = null
+        }
+        reconnectConnecting = false
         logd { "Connecting to ${bleDevice.name} (${bleDevice.address})" }
 
         // Clean up any existing GATT connection
@@ -241,6 +247,55 @@ class BleManager private constructor(private val context: Context) {
         bluetoothGatt?.disconnect()
     }
 
+    fun disconnectAndUnbond() {
+        isUserDisconnect = true
+        cancelAutoReconnect()
+        stopWatchdog()
+        stopBatteryPolling()
+        connectionTimer?.let { handler.removeCallbacks(it) }
+        connectionTimer = null
+
+        // 기기에 본딩 삭제 + 재부팅 명령 (msr?)
+        sendRaw(CRC16.buildCommandASCII("msr", " "))
+        debugLogger.info("TX msr? unbond & reboot device")
+
+        val device = bluetoothGatt?.device
+
+        // 기기가 재부팅되므로 약간 대기 후 GATT 정리
+        handler.postDelayed({
+            bluetoothGatt?.let { gatt ->
+                try { gatt.disconnect(); gatt.close() } catch (_: Exception) {}
+            }
+            bluetoothGatt = null
+            txCharacteristic = null
+            rxCharacteristic = null
+            isConnected.value = false
+            isServiceReady.value = false
+            connectedDeviceName.value = ""
+            batteryLevel.value = 0
+            lastConnectedAddress = null
+
+            // Android 측 본딩 정보도 삭제
+            device?.let { dev ->
+                try {
+                    val method = dev.javaClass.getMethod("removeBond")
+                    method.invoke(dev)
+                    logd { "removeBond called for ${dev.address}" }
+                } catch (e: Exception) {
+                    logw { "removeBond failed: ${e.message}" }
+                }
+            }
+
+            // 저장된 기기 정보 삭제
+            try {
+                val prefs = context.getSharedPreferences("medilight_prefs", Context.MODE_PRIVATE)
+                prefs.edit().remove("last_device_address").remove("last_device_name").apply()
+            } catch (_: Exception) {}
+
+            debugLogger.info("DEVICE_UNREGISTERED")
+        }, 300)
+    }
+
     // Reconnection
     fun reconnectToLastDevice(lastDeviceAddress: String?) {
         if (lastDeviceAddress == null || bluetoothAdapter?.isEnabled != true) {
@@ -248,6 +303,13 @@ class BleManager private constructor(private val context: Context) {
             return
         }
 
+        // Stop any active reconnect scan first
+        reconnectScanCallback?.let { cb ->
+            try { bluetoothAdapter.bluetoothLeScanner?.stopScan(cb) } catch (_: Exception) {}
+            reconnectScanCallback = null
+        }
+        reconnectConnecting = false
+
         // Clean up existing
         bluetoothGatt?.let { gatt ->
             try { gatt.disconnect(); gatt.close() } catch (_: Exception) {}
@@ -481,6 +543,7 @@ class BleManager private constructor(private val context: Context) {
     }
 
     private var reconnectScanCallback: ScanCallback? = null
+    @Volatile private var reconnectConnecting = false
 
     private fun attemptAutoReconnect() {
         val targetAddress = lastConnectedAddress ?: return
@@ -492,11 +555,12 @@ class BleManager private constructor(private val context: Context) {
         }
 
         reconnectAttempt++
+        reconnectConnecting = false
         logd { "Auto-reconnect #$reconnectAttempt: scanning for $targetName ($targetAddress)" }
         debugLogger.info("RECONNECT_SCAN #$reconnectAttempt scanning for $targetName")
 
         bluetoothGatt?.let { gatt ->
-            try { gatt.close() } catch (_: Exception) {}
+            try { gatt.disconnect(); gatt.close() } catch (_: Exception) {}
             bluetoothGatt = null
         }
 
@@ -514,17 +578,18 @@ class BleManager private constructor(private val context: Context) {
 
         val callback = object : ScanCallback() {
             override fun onScanResult(callbackType: Int, result: ScanResult) {
+                if (reconnectConnecting) return
                 val name = try { result.device.name ?: "" } catch (_: Exception) { "" }
                 val address = result.device.address
 
                 if (address == targetAddress || (targetName.isNotEmpty() && name == targetName)) {
+                    reconnectConnecting = true
                     logd { "Reconnect scan found: $name ($address)" }
                     debugLogger.info("RECONNECT_FOUND $name ($address) RSSI=${result.rssi}")
 
                     try { scanner.stopScan(this) } catch (_: Exception) {}
                     reconnectScanCallback = null
 
-                    // Connect directly (autoConnect=false for fast connection)
                     bluetoothGatt = result.device.connectGatt(
                         context, false, gattCallback, BluetoothDevice.TRANSPORT_LE
                     )
@@ -735,14 +800,17 @@ class BleManager private constructor(private val context: Context) {
         }
 
         override fun onCharacteristicChanged(gatt: BluetoothGatt, characteristic: BluetoothGattCharacteristic, value: ByteArray) {
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
                 if (characteristic.uuid == RX_CHAR_UUID) {
                     if (value.size < 4) return
                     handler.post { processReceivedData(value) }
                 }
             }
+        }
 
         @Deprecated("Deprecated in API 33", ReplaceWith("onCharacteristicChanged(gatt, characteristic, value)"))
         override fun onCharacteristicChanged(gatt: BluetoothGatt, characteristic: BluetoothGattCharacteristic) {
+            if (Build.VERSION.SDK_INT < Build.VERSION_CODES.TIRAMISU) {
                 if (characteristic.uuid == RX_CHAR_UUID) {
                     @Suppress("DEPRECATION")
                     val data = characteristic.value ?: return
@@ -750,6 +818,7 @@ class BleManager private constructor(private val context: Context) {
                     handler.post { processReceivedData(data) }
                 }
             }
+        }
 
         override fun onReadRemoteRssi(gatt: BluetoothGatt, rssi: Int, status: Int) {
             if (status == BluetoothGatt.GATT_SUCCESS) {

app/src/main/java/com/example/medilightv2android/managers/PiezoBVEstimator.kt

@@ -35,8 +35,8 @@ object PiezoHW {
     var activePreset: DevicePreset = DevicePreset.V0
 
     fun autoDetectPreset(deviceName: String) {
-        if (deviceName.startsWith("VBT2604") && deviceName.length >= 9) {
+        if (deviceName.startsWith("VBT2604") && deviceName.length >= 10) {
-            when (deviceName[7]) {
+            when (deviceName[8]) {
                 '0' -> activePreset = DevicePreset.V0
                 '2' -> activePreset = DevicePreset.V1
                 '3' -> activePreset = DevicePreset.V2
@@ -91,7 +91,7 @@ object PiezoHW {
     val degreeLR: DoubleArray get() = centerCh.map { degreeLRAll[it] }.toDoubleArray()
 
     /** Acoustic calibration (런타임 조절 가능) */
-    var distancePerSample: Double = 1.771   // mm/sample
+    var distancePerSample: Double = 1.968   // mm/sample
     const val delayOffsetMm: Double = 6.85
 
     /** Volume model */

app/src/main/java/com/example/medilightv2android/managers/PiezoEchoAnalyzer.kt

@@ -17,7 +17,7 @@ data class LowEchoResult(
     val lowStart: Int,          // low-echo span 시작
     val lowEnd: Int,            // low-echo span 끝 (inclusive)
     val lowMean: Double,        // low-echo 구간 평균 진폭
-    val urineLen: Int,          // post - ant - 1
+    val urineLen: Int,          // post - ant
     val score: Double,          // low_depth * urine_len
     val innerPeaks: List<Int>   // (ant, post) 내부 local peak indices
 ) {
@@ -373,8 +373,9 @@ class PiezoEchoAnalyzer private constructor() {
     private fun detectLowEchoCore(sg: DoubleArray, threshold: Double): LowEchoResult? {
         if (sg.size < 10) return null
 
-        // 1) low-echo span 추출
+        // 1) low-echo span 추출 (postMaxIdx까지만 — 이후는 노이즈)
-        val lowMask = BooleanArray(sg.size) { sg[it] <= threshold }
+        val analysisLimit = min(sg.size, postMaxIdx + 1)
+        val lowMask = BooleanArray(sg.size) { it < analysisLimit && sg[it] <= threshold }
         val rawSpans = contiguousTrueSpans(lowMask).filter { it.second - it.first + 1 >= lowMinLen }
 
         // 2) 병합 — gap 내부에 벽 후보(threshold + 5 초과 peak)가 있으면 병합하지 않음
@@ -383,7 +384,7 @@ class PiezoEchoAnalyzer private constructor() {
         val firstSpan = spans.firstOrNull() ?: return null
 
         val s = max(0, firstSpan.first)
-        val e = min(sg.size - 1, firstSpan.second)
+        val e = min(analysisLimit - 1, firstSpan.second)
         if (s > e) return null
 
         val lowSlice = safeSlice(sg, from = s, to = e) ?: return null
@@ -397,20 +398,23 @@ class PiezoEchoAnalyzer private constructor() {
         var post = selectWallByProminence(sg = sg, edge = e, searchWin = peakSearchWin,
             peakMin = peakMin, side = WallSide.POST, otherEdge = s) ?: return null
 
-        // 4) post > POST_MAX_IDX: prominence 기반 재탐색
+        // 4) post가 분석 범위를 넘으면 재탐색
-        if (post > postMaxIdx) {
+        if (post >= analysisLimit) {
             val backHalfEdge = (s + e) / 2
             post = selectWallByProminence(
                 sg = sg, edge = backHalfEdge,
-                searchWin = postMaxIdx - backHalfEdge,
+                searchWin = analysisLimit - 1 - backHalfEdge,
                 peakMin = peakMin, side = WallSide.POST, otherEdge = null
             ) ?: return null
         }
 
         val antH = sg[ant]
         val postH = sg[post]
+
+        if (postH < threshold) return null
+
         val lowDepth = ((antH + postH) / 2.0) - lowMean
-        val urineLen = post - ant - 1
+        val urineLen = post - ant
 
         if (urineLen < minUrineLen) return null
 

app/src/main/java/com/example/medilightv2android/ui/views/connection/DeviceScanView.kt

@@ -49,6 +49,7 @@ fun DeviceScanView(appState: AppState) {
         .sortedByDescending { it.rssi }
 
     val isConnected by bleManager.isConnected
+    val isServiceReady by bleManager.isServiceReady
     val isScanning by bleManager.isScanning
     val bluetoothEnabled by bleManager.bluetoothEnabled
     val connectionError by bleManager.connectionError
@@ -93,8 +94,8 @@ fun DeviceScanView(appState: AppState) {
         }
     }
 
-    LaunchedEffect(isConnected) {
+    LaunchedEffect(isServiceReady) {
-        if (isConnected) {
+        if (isServiceReady) {
             connectingDeviceAddress = null
             appState.deviceConnected()
         }
@@ -340,9 +341,9 @@ private fun DeviceRow(device: BleDevice, isConnecting: Boolean, enabled: Boolean
 @Composable
 private fun SignalBars(rssi: Int) {
     val strength = when {
-        rssi >= -65 -> 4  // Good+Excellent 통합 → Green
+        rssi >= -80 -> 4  // Good
-        rssi >= -80 -> 2
+        rssi >= -90 -> 2  // Fair
-        else -> 1
+        else -> 1         // Weak
     }
     val color = when {
         strength >= 4 -> Color.Green
@@ -363,8 +364,8 @@ private fun SignalBars(rssi: Int) {
 }
 
 private fun signalLabel(rssi: Int): String = when {
-    rssi >= -65 -> "Good"
+    rssi >= -80 -> "Good"
-    rssi >= -80 -> "Fair"
+    rssi >= -90 -> "Fair"
     else -> "Weak"
 }
 

app/src/main/java/com/example/medilightv2android/ui/views/home/HomeView.kt

@@ -8,9 +8,6 @@ import androidx.compose.material3.Button
 import androidx.compose.material3.ButtonDefaults
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
-import androidx.compose.runtime.LaunchedEffect
-import androidx.compose.ui.platform.LocalContext
-import com.example.medilightv2android.ble.BleManager
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
@@ -25,12 +22,6 @@ import com.example.medilightv2android.ui.theme.*
 
 @Composable
 fun HomeView(appState: AppState) {
-    val context = LocalContext.current
-    // 앱 시작 시 마지막 기기에 자동 연결 시도
-    LaunchedEffect(Unit) {
-        BleManager.getInstance(context).autoConnectLastDevice()
-    }
-
     Column(
         modifier = Modifier
             .fillMaxSize()

app/src/main/java/com/example/medilightv2android/ui/views/monitoring/PiezoMonitoringView.kt

@@ -536,70 +536,42 @@ fun PiezoMonitoringView(appState: AppState) {
                 .padding(horizontal = hPad, vertical = if (isCompact) 8.dp else 16.dp),
             verticalAlignment = Alignment.CenterVertically
         ) {
-            IconButton(onClick = { appState.goHome() }, modifier = Modifier.size(48.dp)) {
+            val btnSize = if (isCompact) 36.dp else 44.dp
-                Icon(Icons.Default.Home, "Home", tint = MlPrimary, modifier = Modifier.size(if (isCompact) 20.dp else 24.dp))
+            val iconSize = if (isCompact) 20.dp else 24.dp
-            }
+            IconButton(onClick = { appState.currentScreen = AppScreen.PLACEMENT_GUIDE }, modifier = Modifier.size(btnSize)) {
-            IconButton(onClick = { appState.currentScreen = AppScreen.PLACEMENT_GUIDE }, modifier = Modifier.size(48.dp)) {
+                Icon(Icons.Default.MyLocation, "Placement", tint = MlPrimary, modifier = Modifier.size(iconSize))
-                Icon(Icons.Default.MyLocation, "Placement", tint = MlPrimary, modifier = Modifier.size(if (isCompact) 20.dp else 24.dp))
-            }
-            IconButton(onClick = { appState.currentScreen = AppScreen.VOIDING_DIARY }, modifier = Modifier.size(48.dp)) {
-                Icon(Icons.Default.Description, stringResource(R.string.voiding_diary), tint = MlPrimary, modifier = Modifier.size(if (isCompact) 20.dp else 24.dp))
-            }
-            IconButton(onClick = { appState.currentScreen = AppScreen.REMINDER_SETTINGS }, modifier = Modifier.size(48.dp)) {
-                Icon(Icons.Default.Notifications, contentDescription = "Reminder", tint = MlPrimary, modifier = Modifier.size(if (isCompact) 20.dp else 24.dp))
-            }
-            if (!isCompact) {
-                Text("Bladder Monitor", fontSize = 20.sp, fontWeight = FontWeight.Bold, modifier = Modifier.padding(start = 8.dp))
             }
             Spacer(modifier = Modifier.weight(1f))
 
-            if (isAutoMeasuring) {
+            // Battery icon (color by level)
+            if (!isDemoMode) {
+                val batteryColor = when {
+                    batteryLvl >= 60 -> Color(0xFF4CAF50)
+                    batteryLvl >= 30 -> Color(0xFFFF9800)
+                    else -> Color.Red
+                }
+                val batteryIcon = when {
+                    batteryLvl >= 60 -> Icons.Default.BatteryFull
+                    batteryLvl >= 30 -> Icons.Default.Battery4Bar
+                    else -> Icons.Default.Battery1Bar
+                }
+                Icon(batteryIcon, "Battery $batteryLvl%", tint = batteryColor, modifier = Modifier.size(iconSize))
+            }
+
+            // Connection dot
             Box(
                 modifier = Modifier
-                        .clip(RoundedCornerShape(8.dp))
+                    .size(8.dp)
-                        .background(Color.Red.copy(alpha = 0.12f))
-                        .padding(horizontal = 6.dp, vertical = 3.dp)
-                ) {
-                    Text(if (isCompact) "A" else "Auto", fontSize = 11.sp, fontWeight = FontWeight.Bold, color = Color.Red)
-                }
-                Spacer(modifier = Modifier.width(4.dp))
-            }
-
-            // Catheter count
-            Row(
-                modifier = Modifier
-                    .clip(RoundedCornerShape(8.dp))
-                    .background(MlPrimary.copy(alpha = 0.1f))
-                    .clickable { showAddCatheterDialog = true }
-                    .padding(horizontal = 6.dp, vertical = 3.dp),
-                verticalAlignment = Alignment.CenterVertically
-            ) {
-                Icon(Icons.Default.Add, "Add catheter", tint = MlPrimary, modifier = Modifier.size(12.dp))
-                Text("$catheterCount", fontSize = 12.sp, fontWeight = FontWeight.Bold, color = MlPrimary)
-            }
-            Spacer(modifier = Modifier.width(4.dp))
-
-            IconButton(onClick = { appState.showHistory() }, modifier = Modifier.size(48.dp)) {
-                Icon(Icons.Default.History, "History", tint = MlSecondaryText, modifier = Modifier.size(if (isCompact) 20.dp else 24.dp))
-            }
-            IconButton(onClick = { showSettings = !showSettings }, modifier = Modifier.size(48.dp)) {
-                Icon(Icons.Default.Settings, "Settings", tint = if (showSettings) MlPrimary else MlSecondaryText, modifier = Modifier.size(if (isCompact) 20.dp else 24.dp))
-            }
-
-            // Battery / Demo
-            if (isDemoMode) {
-                Text("DEMO", fontSize = 10.sp, fontWeight = FontWeight.Bold, color = Color.White,
-                    modifier = Modifier.clip(RoundedCornerShape(4.dp)).background(Color(0xFFFF9500)).padding(horizontal = 4.dp, vertical = 2.dp))
-            } else if (!isCompact) {
-                Text("$batteryLvl%", fontSize = 13.sp, color = MlSecondaryText)
-            }
-            Spacer(modifier = Modifier.width(4.dp))
-            Box(
-                modifier = Modifier
-                    .size(10.dp)
                     .clip(CircleShape)
-                    .background(if (isDemoMode || isConnected) Color.Green else Color.Red)
+                    .background(if (isDemoMode || isConnected) Color(0xFF4CAF50) else Color.Red)
             )
+
+            Spacer(modifier = Modifier.width(4.dp))
+
+            // Settings button
+            IconButton(onClick = { showSettings = !showSettings }, modifier = Modifier.size(btnSize)) {
+                Icon(Icons.Default.Settings, "Settings", tint = if (showSettings) MlPrimary else MlSecondaryText, modifier = Modifier.size(iconSize))
+            }
         }
 
         if (showDisconnectionBanner) {
@@ -725,6 +697,41 @@ fun PiezoMonitoringView(appState: AppState) {
                             Spacer(modifier = Modifier.weight(1f))
                             Text("${appState.piezoSettings.maxVolume} ml", fontSize = 14.sp, color = MlSecondaryText)
                         }
+
+                        HorizontalDivider()
+
+                        // Disconnect device
+                        var showDisconnectConfirm by remember { mutableStateOf(false) }
+                        Button(
+                            onClick = { showDisconnectConfirm = true },
+                            modifier = Modifier.fillMaxWidth().height(44.dp),
+                            shape = RoundedCornerShape(12.dp),
+                            colors = ButtonDefaults.buttonColors(containerColor = Color.Red.copy(alpha = 0.1f))
+                        ) {
+                            Icon(Icons.Default.LinkOff, null, tint = Color.Red, modifier = Modifier.size(18.dp))
+                            Spacer(modifier = Modifier.width(8.dp))
+                            Text("Disconnect Device", fontSize = 14.sp, fontWeight = FontWeight.SemiBold, color = Color.Red)
+                        }
+
+                        if (showDisconnectConfirm) {
+                            AlertDialog(
+                                onDismissRequest = { showDisconnectConfirm = false },
+                                title = { Text("Disconnect Device") },
+                                text = { Text("기기 연결을 해제하고 페어링 정보를 삭제합니다. 다시 연결하려면 기기 검색이 필요합니다.") },
+                                confirmButton = {
+                                    TextButton(onClick = {
+                                        showDisconnectConfirm = false
+                                        showSettings = false
+                                        // Disconnect + remove bond + clear saved device
+                                        bleManager.disconnectAndUnbond()
+                                        appState.goHome()
+                                    }) { Text("Disconnect", color = Color.Red) }
+                                },
+                                dismissButton = {
+                                    TextButton(onClick = { showDisconnectConfirm = false }) { Text("Cancel") }
+                                }
+                            )
+                        }
                     }
                 }
             }
@@ -776,67 +783,53 @@ fun PiezoMonitoringView(appState: AppState) {
                 InfoCard("Level", "${appState.bladderLevel.currentLevel}/${BladderLevel.MAX_LEVEL}", "", urgency.accentColor, Modifier.weight(1f))
             }
 
-            // Control buttons
+            // Control buttons: Catheterize / Auto / Spot
-            Row(horizontalArrangement = Arrangement.spacedBy(16.dp)) {
+            Row(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
-                // Catheterize button → 배뇨 기록 시트
+                // Catheterize
                 Button(
                     onClick = { showCatheterizeSheet = true },
-                    modifier = Modifier.weight(1f).height(56.dp),
+                    modifier = Modifier.weight(1.2f).height(52.dp),
-                    shape = RoundedCornerShape(16.dp),
+                    shape = RoundedCornerShape(14.dp),
                     colors = ButtonDefaults.buttonColors(containerColor = MlPrimary.copy(alpha = 0.1f))
                 ) {
-                    Text("Catheterize", fontSize = 16.sp, fontWeight = FontWeight.SemiBold, color = MlPrimary)
+                    Text("Catheterize", fontSize = 13.sp, fontWeight = FontWeight.SemiBold, color = MlPrimary)
                 }
 
-                // Spot button (tap = single, long press = auto 30s)
+                // Auto
-                Box(
+                Button(
-                    modifier = Modifier
+                    onClick = {
-                        .weight(1f)
+                        if (isAutoMeasuring) stopAutoMeasure() else startAutoMeasure()
-                        .height(56.dp)
-                        .clip(RoundedCornerShape(16.dp))
-                        .background(
-                            Brush.horizontalGradient(
-                                if (isAutoMeasuring) listOf(Color.Red, Color(0xFFFF9500))
-                                else urgency.gradientColors
-                            )
-                        )
-                        .pointerInput(isAutoMeasuring, isMeasuring) {
-                            detectTapGestures(
-                                onTap = {
-                                    if (isAutoMeasuring) stopAutoMeasure()
-                                    else if (!isMeasuring) measure()
                     },
-                                onLongPress = {
+                    modifier = Modifier.weight(1f).height(52.dp),
-                                    if (!isAutoMeasuring && !isMeasuring) startAutoMeasure()
+                    shape = RoundedCornerShape(14.dp),
-                                }
+                    colors = ButtonDefaults.buttonColors(
+                        containerColor = if (isAutoMeasuring) Color.Red else Color(0xFFFF9800)
                     )
-                        },
-                    contentAlignment = Alignment.Center
                 ) {
-                    Row(verticalAlignment = Alignment.CenterVertically) {
+                    if (isAutoMeasuring) {
-                        if (isMeasuring && !isAutoMeasuring) {
+                        Text("Stop", fontSize = 13.sp, fontWeight = FontWeight.SemiBold, color = Color.White)
-                            CircularProgressIndicator(color = Color.White, modifier = Modifier.size(20.dp), strokeWidth = 2.dp)
+                    } else {
-                        }
+                        Text("Auto", fontSize = 13.sp, fontWeight = FontWeight.SemiBold, color = Color.White)
-                        Spacer(modifier = Modifier.width(8.dp))
-                        Text(
-                            when {
-                                isAutoMeasuring -> "Stop"
-                                isMeasuring -> "Measuring..."
-                                else -> "Spot"
-                            },
-                            fontSize = 16.sp,
-                            fontWeight = FontWeight.SemiBold,
-                            color = Color.White
-                        )
-                    }
                     }
                 }
 
-            Text(
+                // Spot (single measurement)
-                if (isAutoMeasuring) "Auto: IMU 1s + Measure 10s (#$autoTickCount)" else "Long press for auto (IMU 1s + measure 10s)",
+                Button(
-                fontSize = 11.sp,
+                    onClick = { if (!isMeasuring && !isAutoMeasuring) measure() },
-                color = if (isAutoMeasuring) Color.Red.copy(alpha = 0.7f) else MlSecondaryText
+                    enabled = !isMeasuring && !isAutoMeasuring,
+                    modifier = Modifier.weight(1f).height(52.dp),
+                    shape = RoundedCornerShape(14.dp),
+                    colors = ButtonDefaults.buttonColors(
+                        containerColor = urgency.gradientColors.first()
                     )
+                ) {
+                    if (isMeasuring && !isAutoMeasuring) {
+                        CircularProgressIndicator(color = Color.White, modifier = Modifier.size(18.dp), strokeWidth = 2.dp)
+                    } else {
+                        Text("Spot", fontSize = 13.sp, fontWeight = FontWeight.SemiBold, color = Color.White)
+                    }
+                }
+            }
 
             // ── Developer Tools toggle ──
             Button(

app/src/main/java/com/example/medilightv2android/ui/views/monitoring/PlacementGuideView.kt

@@ -294,14 +294,9 @@ fun PlacementGuideView(appState: AppState) {
 
             // 첫 스캔 시 1회만 piezo power on
             var piezoPowered by remember { mutableStateOf(false) }
+            val handler = remember { android.os.Handler(android.os.Looper.getMainLooper()) }
 
-            fun performScan() {
+            fun sendMeasureCommand() {
-                if (isScanning) return
-                isScanning = true
-                if (!piezoPowered) {
-                    bleManager.sendPiezoPowerOn()
-                    piezoPowered = true
-                }
                 bleManager.piezoCollector.onMultiChannelComplete = { channels ->
                     isScanning = false
                     scanCount++
@@ -319,13 +314,6 @@ fun PlacementGuideView(appState: AppState) {
                                 detected[ch.channel] = true
                                 urineLens[ch.channel] = analysis.result.urineLen
                                 allWalls[ch.channel] = Pair(analysis.result.ant, analysis.result.post)
-                            } else {
-                                val gate = UrinAI.detect(ch.buffer)
-                                if (gate.detected && (gate.bw - gate.fw) >= MIN_URINE_LEN_PLACEMENT) {
-                                    detected[ch.channel] = true
-                                    urineLens[ch.channel] = gate.bw - gate.fw
-                                    allWalls[ch.channel] = Pair(gate.fw, gate.bw)
-                                }
                             }
                         }
                     }
@@ -377,7 +365,19 @@ fun PlacementGuideView(appState: AppState) {
                 bleManager.sendAllChannels()
             }
 
-            // Continuous scan loop (3초 간격) — LED는 스캔 콜백에서 동적 제어
+            fun performScan() {
+                if (isScanning) return
+                isScanning = true
+                if (!piezoPowered) {
+                    bleManager.sendPiezoPowerOn()
+                    piezoPowered = true
+                    handler.postDelayed({ sendMeasureCommand() }, 500)
+                } else {
+                    sendMeasureCommand()
+                }
+            }
+
+            // Continuous scan loop (1초 간격) — LED는 스캔 콜백에서 동적 제어
             LaunchedEffect(isContinuousMode) {
                 if (isContinuousMode) {
                     performScan()
@@ -464,11 +464,21 @@ fun PlacementGuideView(appState: AppState) {
             }
 
             // Skip button
-            Spacer(modifier = Modifier.height(16.dp))
+            Spacer(modifier = Modifier.height(12.dp))
-            TextButton(onClick = { appState.placementComplete() }) {
+            Button(
+                onClick = { appState.placementComplete() },
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .height(48.dp),
+                shape = RoundedCornerShape(14.dp),
+                colors = ButtonDefaults.buttonColors(
+                    containerColor = MlSecondaryText.copy(alpha = 0.15f)
+                )
+            ) {
                 Text(
-                    text = "Skip Placement Guide",
+                    text = "Skip",
-                    fontSize = 13.sp,
+                    fontSize = 15.sp,
+                    fontWeight = FontWeight.SemiBold,
                     color = MlSecondaryText
                 )
             }

app/src/main/java/com/example/medilightv2android/ui/views/onboarding/OnboardingView.kt

@@ -27,8 +27,7 @@ import com.example.medilightv2android.ui.theme.*
 import kotlinx.coroutines.launch
 
 private val pages = listOf(
-    "Welcome to MedilightV2" to "Smart bladder monitoring\nfor better quality of life",
+    "Welcome to VesiScan-Basic" to "Smart bladder monitoring\nfor better quality of life",
-    "NIRS & Piezo Sensors" to "Advanced dual-sensor technology\nfor accurate measurements",
     "Real-time Monitoring" to "Track your bladder level\nwith instant visual feedback"
 )
 

app/src/main/java/com/example/medilightv2android/ui/views/personalization/PiezoPersonalizationView.kt

@@ -62,28 +62,6 @@ fun PiezoPersonalizationView(appState: AppState) {
             IconButton(onClick = { appState.backToSensorSelect() }) {
                 Icon(Icons.AutoMirrored.Filled.ArrowBack, "Back", tint = MlPrimary)
             }
-            Spacer(modifier = Modifier.weight(1f))
-            Text("Step $currentStep of $totalSteps", fontSize = 14.sp, fontWeight = FontWeight.SemiBold, color = MlSecondaryText)
-            Spacer(modifier = Modifier.weight(1f))
-            Spacer(modifier = Modifier.width(20.dp))
-        }
-
-        // Progress bar
-        Box(
-            modifier = Modifier
-                .fillMaxWidth()
-                .padding(horizontal = 24.dp)
-                .height(6.dp)
-                .clip(RoundedCornerShape(4.dp))
-                .background(MlPrimary.copy(alpha = 0.15f))
-        ) {
-            Box(
-                modifier = Modifier
-                    .fillMaxWidth(currentStep.toFloat() / totalSteps)
-                    .fillMaxHeight()
-                    .clip(RoundedCornerShape(4.dp))
-                    .background(Brush.horizontalGradient(listOf(MlTeal, MlPrimary)))
-            )
         }
 
         Spacer(modifier = Modifier.height(24.dp))
@@ -173,8 +151,12 @@ private fun MaxVolumeStep(appState: AppState) {
         Text("Set your maximum bladder capacity", fontSize = 14.sp, color = MlSecondaryText)
         Spacer(modifier = Modifier.height(24.dp))
 
+        Row(verticalAlignment = Alignment.Bottom) {
             Text("${appState.piezoSettings.maxVolume}", fontSize = 56.sp, fontWeight = FontWeight.Bold, color = MlPrimary)
-        Text("ml", fontSize = 20.sp, color = MlSecondaryText)
+            Spacer(modifier = Modifier.width(8.dp))
+            Text("mL", fontSize = 22.sp, fontWeight = FontWeight.SemiBold, color = MlSecondaryText,
+                modifier = Modifier.padding(bottom = 10.dp))
+        }
 
         Spacer(modifier = Modifier.height(16.dp))