Having difficulty reading ADXL345 accelerometer through Firefly

Hi, everyone 

To begin with, my intention is to create a rectangular physical device that can be adjusted in length and angle with accelerometers (ADXL345 connected to Arduino) attached to each corners of the  device which then sends the X Y Z coordinates of each angle through Firefly to move Points in Rhino 5 and create a live-modeled shape,

What I'm dealing with right now is Firefly components in Grasshopper won't read the coordinates data of the accelerometer  (basically the output is 0<empty>). When I used ADXL345 Sensortest code in Arduino IDE it was able to read the X Y Z, therefore I dont think it's any problem with the hardware. I'm wondering does it have anything to do with the code in Arduino IDE, Firefly stuff or my wiring. Right now I just need Grasshopper to be able to live read the X Y Z coordinate from the accelerometer.