Thesis - Teknisk Design

a touch screen, there is no haptic feedback to know if they are actually moving thelist and moreover how fast are they moving it. To cover this deficiency the scrollingtrough data haptic feedback was created. There are two scrolling list in theprototype and it was chosen to have one with haptic feedback and the otherwithout haptic feedback.Actions with confirmation haptic feedbackIn the other hand there is the confirmation feedback. It should be stressed thepossibility to include wrong-activation confirmation feedback or lack of hapticfeedback for the same purpose. Due to the localization of the touch screen, ontothe dashboard in a car, with the possibility of having vibration from the motor thatcan be confused with a confirmation feedback, it was decided to better include anerror haptic feedback when the interaction was not well performed ond the actionwas not activated. The actions included in the first prototype to have a confirmationhaptic feedback are listed below.Activated ActionWhen a button is clicked in any way, this was explained before in this text (pp. 39),an activation haptic feedback is transferred to the user. The buttons that haveactivation feedback are the main menu buttons, the radio buttons, the e-mails, thecontacts list in the telephone and the keypad buttons from the telephone. Anothervariation of the activated action feedback included in the telephone buttons ismore suitable from the author point of view. But there is one drawback, elongationof learnability. That is the reason not to use this variation, but it will be presented bythe discussionNot-Activated ActionThe not-activated haptic feedback is produced when an activity or button was notwell selected, e.g. when you click in an empty space or when you ask for anunavailable command. You receive this feedback in the device when you click inan empty space of the screen, when you push a telephone contact withoutdeselecting the last contact or while calling, video calling or messaging anothertelephone button is pushed without ending the last action.Type of haptic feedbackAfter selecting both the activities and the interactions that would include hapticfeedback, the next decision to take is the haptic feedback for each one. For thispurpose there were three possibilities that match the device acquired. All three areconnected and are part of the Universal Haptic Layer (UHL) from Immersion(Immersion Corporation 1).In one hand there is the android effect library from Immersion, this librarycontains a wide variety of predefined tactons that can be implemented at any timeby the device (Appendix I). In the Immersion page it can be found advices on theuse of it as tips of what they might mean for the users (Immersion Corporation 2).Another way to produce the haptic feedback is to use the standard vibration35