diff --git a/test_audioinput.py b/test_audioinput.py
new file mode 100644
index 0000000..779ef3a
--- /dev/null
+++ b/test_audioinput.py
@@ -0,0 +1,32 @@
+#!/usr/bin/env python3
+
+"""
+test_audioinput.py
+Quick sanity check to ensure audio input device is working.
+Records 2 seconds of audio from default input and plots waveform.
+"""
+
+import numpy as np
+import matplotlib.pyplot as plt
+import sounddevice as sd
+
+DURATION = 2  # seconds
+SAMPLERATE = 48000
+CHANNELS = 1
+
+print("🔊 Recording 2 seconds from default input device...")
+recording = sd.rec(int(DURATION * SAMPLERATE), samplerate=SAMPLERATE, channels=CHANNELS, dtype='float32')
+sd.wait()
+
+# Generate time axis
+time_axis = np.linspace(0, DURATION, len(recording))
+
+# Plot
+plt.figure(figsize=(10, 4))
+plt.plot(time_axis, recording, linewidth=0.5)
+plt.title("Audio Input Waveform")
+plt.xlabel("Time [s]")
+plt.ylabel("Amplitude")
+plt.grid(True)
+plt.tight_layout()
+plt.show()