Step1, download from git hub the microcontroller code. This is for the arduino. Locate the ino file. Open the arduino programming sdk tool and upload the sketch to the Mega. If you connect to the serial monitor you can view the output from the sensors.
Step 2. Move the usb cable for the microcontroller and plug it into the Rpi.
Step 3. Put the SD Card image for the Rpi onto a SD Card. I bought the wrong 8 or 16GB card, so I ended up having to use a spare 32 GB card. Not all SD cards are true in size. I got the SD Card image from the release section for the github for the Rpi. https://drive.google.com/file/d/0B32GqKxXLwCoU2ZlNW1YV0l1cW8/view?usp=sharing
I see that github is now saying this is deprecated..... I will need to check out what the new method is going to be....
Step 4. put into the rpi, and boot it. Telnet into the Rpi, you can check the system status to see if python is running the gro-daemon.py if it is. then go get the gro-ui and connect it to the Rpi IP address.