recycling the most ubiquitous cellphone the year 2003 had to offer The watch itself runs off an Arduino board, and manages to fit a Bluetooth module and 3.7v battery into the 3D-printed watch case.

The Arduino processes the data and then transmits it to a smart phone via a Bluetooth module. The whole circuit is powered ... case any one wants to copy his design.

Just reverse the receive (Rx) and transmit (Tx) lines between your Arduino and Bluetooth module, and provide the proper input ... does things much differently. The interface design does not reside on ...

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 ...