working ADC input + FFT analysis + py logger

serial_debug.py

@@ -0,0 +1,19 @@
+"""Quick diagnostic — just print what comes over serial."""
+import sys
+import serial
+
+if len(sys.argv) < 2:
+    print(f"Usage: python {sys.argv[0]} <COM_PORT>")
+    sys.exit(1)
+
+ser = serial.Serial(sys.argv[1], 115200, timeout=2)
+print(f"Listening on {sys.argv[1]}...")
+
+while True:
+    raw = ser.readline()
+    if raw:
+        line = raw.decode("utf-8", errors="replace").strip()
+        prefix = line[:20] if len(line) > 20 else line
+        print(f"[{len(line):5d} chars] {prefix}...")
+    else:
+        print("(timeout — no data)")