This is the sensor itself
This is the sensor worn as a ring (Because of lack of time and resources, tape was used to hold the ring in the finger)
I was thinking of a way to bring easy access to all of our electronic devices, as well as providing a new and simpler interface for more primitive electronics, such as a lamp or a ceiling fan. I came to realize that the simplest way to interact with these electronics would be by detecting the movement of a finger and doing an action depending on what kind of movement was done, that is how the idea of a motion controller in a ring was born.
What it does
The ring is design to control every single electronic device a person owns. Because of time constraints, for now it only works with an LED and a servo motor. When tapping once with your finger on any surface the LED will turn on and off, and when double tapping the servo motor will turn on and off.
How I built it
I made an android app that communicates with the sensor ring via Bluetooth, once a communication path is established, the app makes a Bluetooth link with the micro that controls the LED and the servo motor. It is a three-way communication with the phone as the master and the ring and the micro as slaves: from the ring to the phone, and from the phone to the micro. Once the command gets to the micro, the Arduino app I did takes care of reading the states of the LED and the servo and acting accordingly.
Challenges I ran into
The API for the sensor I am using does not have a well explained documentation, so I had to do an intense research that took a lot of time.
Accomplishments that I'm proud of
The mere fact that the ring works makes me very proud, but if we are talking about things I am proud of as I was developing, I can say I am very proud of finding solutions to the problems I encountered: The things the sensor's documentation did not explain, I found by myself by reading the definition of every class in the docs. It was very time consuming, but in the end it was worth it because I have a working prototype of a great idea.
What I learned
In the technical part I can say I learned more about the sensor's API and how to establish a Bluetooth connection between a master and several slaves on the Android platform, but in a more personal way, I can say I learned to keep pushing forward until I make it. During the developing part, I encountered so many different problems that I started to see if I could work on something else, because I felt I was not going to find a solution, but I stuck to this and went through everything until I found a way to make it work.
What's next for Metawear Control
The next thing is to add more devices to control, as well as using the accelerometer not only for tap detection as I have done for this hack, but also use it to measure tilt detection and so be able to have another way of input: tilt detection can work as a dimmer for a ceiling light. The board I am using for this hack has many integrated sensors that could come in handy when it comes to designing ideas to control electronics. The possibilities are endless!