Application

keyboard.ntl

This application was implemented to allow a disabled user with only 3 channels of output to cycle through the alphabet and generate letters.

The three channels are seen with CH0 (channel 0) CH1 (channel 1) etc., and the yellow sliders give an on-screen display of motion. These analog signals provide the input that makes the LED buttons alongside the screen keypad to move along until the user stops at the column and/or row that he/she wants. Once the user is 'locked' onto the letter, they click their third channel to select that character. This was an initial attempt to build on on-screen keyboard to allow severely disabled users to type on the computer.

The settings for the clock divider (CkDiv) can be adjusted to set the time intervals for letter selection. In this ntl file, the setting is 5.