I am building a project for a blind friend of mine. I want to build a wearable tactile display platform to relay context information to her as she walks. All the available commercial ones are crappy and expensive!
We've discussed it, and all she really wants is an array of maybe 10 TENS (transcutaneous electrical nerve stimulation) outputs that she can hook up to a wearable computer and be fed data through her tactile sense in real time. Having access to things like compass direction, gps mapping, proximity sensors and the like through an open and modifiable platform could significantly increase her independence.
A TENS signal is basically just a high pitched sound wave, so in essence I want to generate a 5-10khz tone, amplify it, split it into 10 channels, and control the volume of each channel independently in real time from a computer via the usb cable. The resolution on the volume control doesn't need to be very high, maybe 5-10 steps.
Is something like this possible? And if so what kind of complexity am I looking at?
Thank you all in advance!