diff --git a/read_teleinfo.py b/read_teleinfo.py
index f10e3d8..9b6b288 100755
--- a/read_teleinfo.py
+++ b/read_teleinfo.py
@@ -8,13 +8,25 @@ import argparse
 import json
 from teleinfo import Parser
 from teleinfo.hw_vendors import UTInfo2
+import subprocess
 
 parser = argparse.ArgumentParser(description='Téléinfo retriever.')
 parser.add_argument("-f", "--format", help="Output format.",
                     type=str, choices=['human-readable', 'raw_json', 'custom_json'], default='human-readable')
 args = parser.parse_args()
 
-ti = Parser(UTInfo2(port="/dev/ttyUSB0"))
+find_ttyUSB_output = subprocess.check_output(["./find_ttyUSB.sh"])
+device = None
+for line in find_ttyUSB_output.decode('utf-8').split("\n"):
+  if "Cartelectronic_Interface_USB_1_TIC_DA6TLO1X" in line:
+    device = line.split(" ")[0]
+    break
+
+if device is None:
+  print ("USB teleinfo device not found.")
+  sys.exit(1)
+
+ti = Parser(UTInfo2(port=device))
 res = ti.get_frame()
 
 if args.format == 'human-readable':