diff --git a/CHANGELOG.md b/CHANGELOG.md
index 70b2bae..6db9253 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # ChangeLog for pymycobot
 
+## v3.5.0 (2024-9-13)
+
+- release v3.6.0
+- add mycobot class  init delay 1.5S
+
 ## v3.5.1 (2024-9-12)
 
 - release v3.5.1
diff --git a/pymycobot/__init__.py b/pymycobot/__init__.py
index ae3e05f..d4601f2 100644
--- a/pymycobot/__init__.py
+++ b/pymycobot/__init__.py
@@ -63,7 +63,7 @@
     from pymycobot.mybuddyemoticon import MyBuddyEmoticon
     __all__.append("MyBuddyEmoticon")
 
-__version__ = "3.5.1"
+__version__ = "3.5.2"
 __author__ = "Elephantrobotics"
 __email__ = "weiquan.xu@elephantrobotics.com"
 __git_url__ = "https://github.com/elephantrobotics/pymycobot"
diff --git a/pymycobot/mycobot.py b/pymycobot/mycobot.py
index 427ac89..880562b 100755
--- a/pymycobot/mycobot.py
+++ b/pymycobot/mycobot.py
@@ -67,6 +67,7 @@ def __init__(self, port, baudrate="115200", timeout=0.1, debug=False, thread_loc
         self._serial_port.timeout = timeout
         self._serial_port.rts = False
         self._serial_port.open()
+        time.sleep(1.5)
         
 
     _write = write