The plan is to take an inexpensive SONAR module (the HC-SR04) and an Arduino Leonardo and use it to perform some simple tasks by mimicking keyboard input from the user.

The HC-SR04 sonar modules are available for a mere pittance and, with some coaxing, can do a pretty decent job of helping your robot measure the distance to the nearest wall. But when sellers on eB… ...

The HC-06 Bluetooth receiver module can be synced with and communicated with at up to 10 meters. I’ve personally tested from one end of my house to the other, and have no problems with connectivity!