We were tasked with sketching out and creating a low level prototype for a device that counts in increments of one in an ascending and descending order. We needed to build this with the persona’s that Katherine outlined in mind.
Before started putting together the prototype, I explored a couple different options for the counting device. One was a ball that would count up or down depending on what side you bounced it on. Another was a box that would increment up it you tipped it over in a clockwise motion and increment down when you tip it over in a counterclockwise motion. In that same vein, I also looked into a hexagonal cylinder that would increment every time you rolled the cylinder onto a new face, depending on the direction of the motion. The direction I ended up taking focused more on simplicity and clarity for both increasing and decreasing the increments.
My counting device has two sides with an LED panel on each side. I would laser cut some acrylic as a mask over the LED to only expose the plus on one side and the minus on the other. The default state for the LED would be off but once a user touched the LED, it would light up the panel with the bright symbol (+/-). I would probably use a piezo sensor and identify exactly when someone was making contact with the LED. As long as your finger was on the LED, the light would stay on with would create a very nice responsive interface with strong visual feedback. However, no matter ho long your finger was on the LED panel, the LCD screen counter would only increment once.
If the + button was facing up, the the LCD screen would automatically be set to 0 so you could increment up by touching the +. If you flipped it over and it displayed the minus, then the LCD screen would be set to the highest value, which you said was 10, and touching the minus would increment downwards. Lastly, there would be a reset button on the side if you wanted to start the incrementation back form the beginning.