The HC-05, a Bluetooth to serial bridge, can be found for around $5 on the internet and therefore may be the cheapest way to add Bluetooth connectivity to your project. However, its default setting… ...

With his Bluetooth module now functioning as a gamepad, ... Now that’s one beautifully documented project. I didn’t know that HC-05 has so much potential, I’ve used it as BT-UART adapter.

The HC-05 Bluetooth module is another critical component, ... Mars Kapadia’s smart glasses project is an impressive example of what can be achieved with ingenuity and the right tools.