Electronic – use two identical bluetooth modules in the same area

To be able to bootload code on the Arduino, the programmer must attempt to connect within about 3 seconds of the AVR coming out of reset. I the ArduinoBT I have lacks a connection that the traditional USB versions have, which allows the programming software to reset the Arduino by itself. In lieu of that, you must physically hit the button to do it yourself.

I cannot see how can I press the reset button on the Arduino during the upload when I have to type the PIN in a different window.

You should only have to type the Bluetooth passkey once, so after the BT module is paired with your computer, the computer should be able to freely connect, so long as it is powered.

The Bluetooth module and AVR are very separate; you can hold the AVR in reset, and the Bluetooth module will happily run along. If you're cutting power to the entire board to reset it, it may indeed be difficult to have the BT module come online, connect to it, and initiate programming all within 3 seconds.

One possible solution is to treat of the two wireless part-keyboards as separate independent keyboards i.e. Bluetooth HID keyboard devices.

• Each of the parts has only a subset of keystrokes it can send to the host.
• The two parts do not need to know about or interact with each other (if there is such a need, this solution is no longer a contender).
• That way, if a particular application needs only numeric, or only alphanumeric inputs, that keyboard alone could be used independently.
• The host Bluetooth device (tablet, PC, ...) needs to pair with both HID devices.