For people with extremely limited mobility pressing an switch can be difficult or impossible. I recently came across a project that used an adafruit feather board and a Myoware muscle sensor to make wireless Bluetooth controller that could activate with a muscle twitch.
If someone could help me figure out how to change the output to be a HID keyboard, it could be a powerful tool for someone who is locked in or with extremely limited mobility.
The parts are under 100$ and the only other comparable commercial product I could find was this:
You can only buy it through insurance. Without it it is about 16,000$. You have to buy the whole package. I have actually tested it out. I have one of the few neurological conditions that it can be covered for. It Helped a lot. I used it as an activation switch in conjuction with eye tracking. It made the whole process of learning to navigate and type with my eyes much more intuitive.
The other cool thing about it is that the sensor outputs a range. So it could be used as more than a binary switch. It measure how hard you flex the muscle. So you could have several keystrokes associated with how hard you squeeze your muscle.
I think this project could help a lot of people who desperately need it.