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I am trying to do serial communication with arduino uno with ros2 humble, i have tried something with micro-ros and it didn't work. There are no clear instructions on how to do it. I just want to push some data to arduino uno and when uno receives it send a signal to ros2 saying that it received data. How can i do it?

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You can use the serial communication without micro-ros, see this video by Articulated Robotics. This is another example how to setup a communication pipeline outside of ROS.

For using micro ROS, you maybe only need a topic-based hardware component instead of a custom one, see: Combining topic based ROS2 control, and DiffBot demo

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