We present TouchSense, a single-tap interaction method that enables fast switching between input modes using different areas on finger pads. It requires minimal touch input area making it especially ideal for wearable devices such as smart watches and smart glasses. For example, users of a calculator application on a smart watch could tap normally to enter numbers, and tap with the right side of their fingers to enter the operators (e.g. +, -, =). Results from two human-factor studies showed that users could tap a touchscreen with five or more distinct areas on their finger pads. Also, they were able to tap with more distinct areas closer to their fingertips. We developed a TouchSense prototype using a smart watch and IMU sensors, and developed two example applications: a calculator and a text editor. We also collected user feedback via an explorative study.
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