Tell us about yourself!
I cut up an old treadmill track and screwed it to the floor for grip but i'm sure carpet would work well too (maybe strips of rafters like a ladder underneath might help as well). Also if doggie has vision problems, you can try a different material and the two ends to let them feel with their feet that they are at the ends (i used foam matt).Maybe round off some of those edges at the entrance if it is at eye level.The things we do for our pets :)
bleech is your friend here.
Dont need 9v for bluetooth. Just bypass the 5V regulator lm7805 on the board and power directly with 5V (short left and right pin with solder). As a side note, are there any bluetooth modules that default to bluetooth when turning on?