Xtencion

A new arduino source code file named Xtencion_KernelSubtraction has been added which implements the kernel subtraction method to detect swipes. So we define a array of distances that best represents a swipe, kernel. The kernel array is of size equal to sample_size. Incoming distance readings are stored in a buffer of size equal to sample_size. The kernel is subtracted from the buffer and the difference is stored in another array. Ideally, the difference array should be an array of zeroes. Although, in real world humans may not be able to reproduce the same swipe repeatedly. Hence, we compute the mean and standard deviation of the difference array. Whenever the mean and standard deviation is inside defined limits a swipe is recognised.

1. Swipe control
2. Wrist control
3. Controlling IoT devices
4. Different smartwatch modes
   1. Watch mode(Default)
   2. Music mode
      1. wrist control of song selection
      2. playing the song using a short swipe
   3. SOS mode
      1. Short swipe to send a SOS message
   4. Xtencion Mode
      1. book a cab or switch off your lights based on time and location
      2. just a short swipe to do that 

• We use 9V batteries to power the watch since we don't yet want to move to the final prototype with the bendable batteries.
• The IR sensor is placed on the other side of the display because it is easier to proceed with the tests in that configuration.
• It is a medium-fidelity working prototype.
• IFTTT block is not public
• WiFi is needed for controlling other IoT devices which will be replaced by cellular network.