diff --git a/app/src/main/java/com/example/medilightv2android/ble/ImuPacketCollector.kt b/app/src/main/java/com/example/medilightv2android/ble/ImuPacketCollector.kt
index 3e64c11..cac90b2 100644
--- a/app/src/main/java/com/example/medilightv2android/ble/ImuPacketCollector.kt
+++ b/app/src/main/java/com/example/medilightv2android/ble/ImuPacketCollector.kt
@@ -129,6 +129,10 @@ class ImuPacketCollector {
             onLog?.invoke("rim: too short (${data.size}B)")
             return
         }
+        // RAW DUMP — division 전 원본 byte + int16 값 logcat 으로 출력 (디버그용).
+        val totalHex = data.joinToString(" ") { "%02X".format(it) }
+        android.util.Log.d("ImuRaw", "rim FULL HEX (${data.size}B): $totalHex")
+
         val numSamples = readBe16(data, 4)
         val payloadBytes = data.size - HEADER_BYTES - CRC_BYTES
         val expectedBytes = numSamples * SAMPLE_SIZE_BYTES
@@ -145,6 +149,15 @@ class ImuPacketCollector {
             val gxRaw = readBe16Signed(data, off + 6)
             val gyRaw = readBe16Signed(data, off + 8)
             val gzRaw = readBe16Signed(data, off + 10)
+
+            // 첫 sample / 마지막 sample 만 raw int16 dump (모든 sample 로깅하면 폭주)
+            if (i == 0 || i == numSamples - 1) {
+                android.util.Log.d("ImuRaw",
+                    "rim sample[$i] raw int16: ax=$axRaw ay=$ayRaw az=$azRaw " +
+                    "gx=$gxRaw gy=$gyRaw gz=$gzRaw " +
+                    "(g if /8192: ax=${"%.4f".format(axRaw / 8192f)} ay=${"%.4f".format(ayRaw / 8192f)} az=${"%.4f".format(azRaw / 8192f)})")
+            }
+
             parsed.add(ImuSample(
                 ax = axRaw / ACCEL_LSB_PER_G,
                 ay = ayRaw / ACCEL_LSB_PER_G,