After long days full of sweat at the workshop, the satisfaction of having finished the project is really great.
The project reached its final version, where the bamboo stick is being moved by the motor as both ends go up and down, producing sound at each end. I connected two piezo modules to both ends and have recorded the installation. Here is how it sounds for those who are interested:
By the way, on one and there is a metal wok pan that is welded to a custom made metal stand and on the other end there is a metal chain that goes up and down in a metal bucket full of water. Here is a short video of the final version in action: