I wanted to create a USB HID that would send a payload when it receives a wireless message.
The idea is to hide the Teensy when the user is not at their computer, then when they return and unlock the computer, to distract them for a couple of seconds so the Teensy keystrokes can be sent undetected.
Wire the HC-05 bluetooth module to the Teensy as follows:
| HC05 | Teensy |
|---|---|
| VCC | 5v |
| Gnd | Gnd |
| Tx | Pin 7 |
| Rx | Pin 8 |
See senddata.ino for the sample sketch. Note: this is only designed for Windows comptuers. It sends a Win+R keystroke, then tells Internet Explorer to open a URL.
Plug the Teensy in to the computer by USB.
Finally, pair the HC-05 with a bluetooth device, I'm using my android phone. Install an app that can send a single character '1' over bluetooth. I'm using BlueTerm, but there are other options too. In the app connect to the HC-05 device, and type the character 1.
If all went well, you should see the run command open, and the string "iexplore.exe https://www.youtube.com/watch?v=5j-sY41ru4M" be entered.