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Houdini connecting with Arduino

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Hello, guys!

Recently, I'm trying to do a project that needs to connect houdini with arduino. I want to use the data I got from ultrasonic sensor from arduino to change the height of a tube in houdini. But it seems that there are some problems of the connection, Anyone can give me some advice?

This is the error message that I got from the software:

Error:       Unable to evaluate expression (
Traceback (most recent call last):
  File "<stdin>", line 2, in expression
  File "opdef:/Object/gwPlatform?PythonModule", line 15, in getHeight
  File "opdef:/Object/gwPlatform?PythonModule", line 3, in updateValues
AttributeError: 'module' object has no attribute 'updateFrame'

And here are some screenshots of my project.



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