MPU6050 / Arduino / Firefly / Grasshopper

Hello folks,

I'm trying to manage how to incorporate data from a Mpu6050 sensor to GH.

This is what I did:

1. I connected the sensor to the board and tested it with a script. It works.

2. I uploaded Firefly_firmata into my Arduino UNO board;

3. I wrote a definition with open port component and serial read (with timer) component, feeding the correct COM number and opening the port in the right time. 

All components are grey, but when I connect a panel component I can't see anything but a list of nosense numbers (see attached image). 

What am I doing wrong? I also downloaded files from this youtube video, but nothing...

https://www.youtube.com/watch?v=RNoAYWtky6g

I really hope in your help :) thank you in advance