My tutorial uses the Mega 2560, so I use Tx/Rx1 (pins 18/19) for the Arduino-to-HC-05 link This part is also well established, and the Arduino-to-HC-05 link can be done with either a hardware port (as with the Mega 2560) or a SoftwareSerial port using the SoftwareSerial library.
A serial link between the PC and the Arduino and between the Arduino and the HC-05. A wireless link (obviously) between the PC and the HC-05. In order to remotely program an Arduino using a HC-05, the following basic parts are required: I found some posts claiming to have succeeded in remotely programming an Arduino using a HC-05 module, but the information was sketchy and incomplete, so I decided I would try and pull all the various sources together into a (hopefully) more complete tutorial for folks like me who want to use a HC-05 module for this purpose. However, I have been playing around with the cheap and small HC-05 Bluetooth module, and decided to see if there was maybe a way to use this module as a replacement for the Wixel.Īs I usually do, I started with LOTS of web research. On my Wall-E2 robot, remote programming/telemetry is accomplished using the very nice Pololu Wixel Shield. 
When I got the robot put together and started testing the motors, I realized I needed a way to remotely program the Arduino controller and remotely receive telemetry, just as I currently do with my 4-wheel Wall-E2 robot.
As part of my recent Wall-E2 Motor Controller Study, I reincarnated my old 2-motor robot as a test platform for Pololu’s ’20D’ metal gear motors.
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