This DIY blink detector can be made in less than 10 minutes for under $10.
A borescope is mounted on a goggle to the side of one eye. Software interprets the camera’s video image to identify two (maybe three) eye gestures. The user could use a scanning ‘keyboard’ to blink out a message. Alternatively, she could blink Morse code.
Instructional video: https://www.youtube.com/watch?v=C95J9l0416I&feature=youtu.be
The borescope is mounted on a goggle so the camera does not move when the head moves, thus making the design a lot more robust than one that uses a web cam (see https://abilityspectrum.wordpress.com/2015/05/18/blink-is-bliss/)
The software is made with Processing and has been tested on OSX. Work is progressing to make the software cross-platform.
We also intend to add functions such as email and texting.