diff --git a/robomaster_pi/conn_vel.py b/robomaster_pi/conn_vel.py
index 66cbeca7de249dc3cd1b88617c795423ce6b6688..f911922dfa415cfddc128ae7d8ab2ecee051015b 100644
--- a/robomaster_pi/conn_vel.py
+++ b/robomaster_pi/conn_vel.py
@@ -12,6 +12,7 @@ from geometry_msgs.msg import Twist
 from tf2_ros import TransformBroadcaster
 import os
 import socket
+import ping3