In the center of the breadboard you can see the cheap and ubiquitous HC-05 Bluetooth module ... schematic on the post uses a voltage divider. The software end of things consists of an Arduino ...

A FT-232 USB to serial board is used to program the Arduino. A standard Bluetooth module has to have HID firmware installed. [Dastardly] makes a homemade daughterboard–er, shield–to connect ...

The HID Relay takes the form of a small adapter that has been built using an Arduino Pro Mini, a Bluetooth module, a USB host shield together with a few other components. Check out the video below ...

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