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10 embedded world the official guide 2021 Trends Gutschein kostenfreies Messeticket Another way of thinking about this is to remember the 4 Es of a good user interface Easy to use Easy to understand Errorfree and Effective for achieving the end goal ▷ How should a developer proceed when designing and implementing an efficient humancentric interface? ▶ Prof Oshana From a design perspective its important to understand and leverage the key laws of user interface design and experience Afew examples are The Aesthetic Usability Principle users often perceive aesthetically pleasing design as design thats more usable Fitts law the time to acquire a target is a function of the distance to and size of the target Hicks law the time it takes to make a decision increases with the number and complexity of choices the Poka-Yoke principle design appropriate constraints into devices or products to prevent errors and Millers law the average person can only retain seven plus or minus two items in their working memory There are many others and the application of these laws in the design of a user interface leads to more effective user experiences From an implementation perspective there are some good embedded tools technologies for UI that can be applied these includee Embedded Wizard and Light and Versatile Graphics Library LVGL LVGL is an open source graphics library that provides graphical elements and widgets python support multi platform and lots of gitbased examples You can find this in the open source community or bundled with embedded software enablement packages such as NXPs MCUXPresso ▷ How can the function and quality of such a humancentric interface be verified? ▶ Prof Ohana There are some relatively simple techniques to verify the function and quality of a user interface Jacob Neilsons Heuristic Evaluation approach uses rules of thumb in other words heuristics to measure the usability of user interfaces by applying inspection techniques Ilike this approach because it can be applied early in development from the prototyping phase through to final product evaluation in the field Also cognitive walkthroughs is another technique where evaluators ask questions about the interface from the perspective of the user performing various tasks or use cases This is useful in the understanding of system learnability for new or infrequent users ▷ Can humancentric interfaces be made abstract so that they can be ported to any application? ▶ Prof Oshana Many human factor concepts can port easily because they are innate properties of humans that never go away If you are developing interfaces to be easily be applied in a wide variety of application segments such as wearables medical automotive etc then Iwould recommend leveraging some of the excellent embedded UI technology tools and libraries that can facilitate embedded UI design and development As an example MicroEJ offers simulation technology that supports rapid prototyping and virtual devices in order to get fast and early feedback from users Furthermore for embedded devices its important to optimize memory ROM RAM and hardware resource usage for the UI Using tools like this and a common set of graphical widgets can help with portability across different electronics which helps leverage the initial design investment Technologies like Crank Softwares Storyboard gives developers the option to select the best OS for a given embedded product whether it is for a resourceconstrained microcontroller or a highperformance microprocessor and provide a way to easily port to another when the project needs to be changed So in summary the human factors port easily the hardware Session Keynote HMI Design Methods Human factors and user interface technology for Embedded Systems Prof Robert Oshana NXP Semiconductors From a human factors perspective we must shift the design perspective away from technology as the end all and more towards usability for embedded devices Analysis of effective humancentered data for interface and interaction requirements provides a firm foundation for the actual usercentered interface design and implementation and the evaluation of an interface and its interaction quality Other topics include the study of human characteristics affected by interface design requirements data collection and analysis usercentered approaches to software engineering and evaluation of interface and interaction quality Wednesday 3 March 13 3014 00 Session 9 2 HMI Design Methods https events wekafachmedien de embeddedworldconference program Understanding basic human factors and then designing to support these human factors is the key to successful user interface design