I’m planning my first Arduino project and am struggling to select the best hardware for supporting Bluetooth. The “Arduino BT” has apparently been “retired” (per Arduino’s website). The Arduino 101 apparently has powerful Bluetooth support, but it seems to be the only Arduino that uses an Intel “x86 (Quark) processor and a 32-bit ARC architecture core” instead of an “ATmega” processor from Microchip Technology. Besides wondering if all of the common Arduino software works on it, the Arduino website says that the 101 is “out of stock.” (I have no idea if this is due to really high demand or really low demand for the 101.) Finally, I see that there are a number of “HC-05” add-in modules available (although not directly from Arduino), but it seems like these only support Bluetooth 2.0 and I figured I’d use newer Bluetooth if I could. (The HC-05 boards I found also require a resistor divider to keep from (possibly) burning out the Rx pin of the HC-05 chip.) And, of course, with multiple HC-05 boards available, I don’t know which one is best to start with.
Although none of these parts are that expensive, I’d hate to waste time by not starting with the best hardware for a Bluetooth project. Thank you for any advice regarding the best, most up-to-date Bluetooth hardware available for the Arduino!