Some time ago, I made the decision to move all of the feedback elements of the prototype Keyglove design to a separate I2C-controlled module, instead of using direct I/O pin connections. I did this because I also added three new touch sensors and better Bluetooth link and mode detection, and I simply didn’t have enough I/O pins to satisfy everything at the same time. The I2C bus was already being used by other modules anyway, so adding an additional slave device didn’t reduce the number of available pins anywhere else. At the same time, I freed up five whole pins for other functionality (Red, Green, Blue, Vibe, and Piezo). Not bad.
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