Thanks for the reply. Both the link you gave and the FAQ are of no use to me--I have no idea how to get github to give me a bunch of files that I can extract and use, When I tried the page you gave and the page pointed to by the FAQ, all I got a whole bunch of html files.
However, I did have success a few weeks ago here: https://github.com/Makeblock-official/Makeblock-Firmware/tree/master/resources/firmware . Those files could be unzipped [extracted] and loaded into the Arduino IDE.
That being said, I couldn't find where the baud rate of the bluetooth serial communication was set. Maybe its set in the Android and iOS app.
Maybe I will upload the Bluetooth Test sketch and just change the rate to see for myself. I cannot imagine it would be harder than getting the tank to work.
Update 1: After verifying my tank ran properly, I did the BT test and successfully changed the rate to 115200. Since I don't know how to do Android programming, I am not sure how I can get my tablet to send characters to the Orion via Bluetooth..\
Update 2: I tried the MakeBlock robot control app, but in order for it to work, it had to upload the "firmware" [aka sketch]. The good news is: the tank runs from the tablet app, just like it did before I ran the BT test.
Update 3: GOT IT!!!! I found an app called Bluetooth teminal. I am using the basic BT test example that echoes to the console via usb serial connection what I type on the tablet.
Update 4: Once I set up line feeds and carriage returns on both the console and the bluetooth terminal app, I have two way communication between the tablet (BT to Orion) and the Arduino serial monitor (usb to laptop).
Footnote: It looks like BT communication and usb serial communication can be running at the same time. However, any time I tried to load a sketch via usb, I got an avrdude error until I disconnected the BT device.
PS: I used Bluetooth Teminal by Querty. There are others; I assume they will work, too.
Hope this helps on the BT/Orion end of things. As for Android programming, maybe I will get into that someday. What program do you use?