The prototyping tools currently available to interaction designers are simply not capable of accessing onboard sensors.
I still use conventional prototyping tools to convey flow, aesthetic, interaction, and motion.
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In that case, determining when the prototype is ready to be tested or demonstrated planning, scripting, and additional hands if needed , can be controlled.
By strapping on a second bracelet adjacent to the smartwatch as shown in Figure 2, it was nearly imperceptible which wrist device emitted the vibrating or audible alert.