Abstract
The concept and the use of haptic devices need to be disseminated and they should become familiar among young people. At present haptics are used in many everyday tasks in different fields. 
 Additionally, their use in interaction with virtual reality applications simulating real systems sense of touch will increase the usersâ?? realism and immersion and, consequently, they will contribute to improve the intrinsic knowledge to the simulationsâ?? goals.
 However, haptics are associated with expensive equipment and usually they offer several degrees of freedom. The objective of this work is to make their cost not much more expensive than a â??specialâ? mouse by offering a low cost solution with just one degree of freedom (1DOF) useful in many simple cases.
 Additionally, it is also an objective of this work the development of simple virtual reality systems requiring interactions only requiring one degree of freedom. 
 A low cost, single-axis force-feedback haptic device of 1 degree of freedom has been developed. For evaluating the interest of this prototype a â??Spring Constantâ? application was built and used as a demonstrator. The complete system - the haptic interacting with the â??Spring Constantâ? - will be described in the present work.
Highlights
The interfaces between a human operator and a machine are the human senses
More recently the sense of touch became more explored in the technological area by using the so called haptic devices
By the provision of means for vision, hearing and touch the operator can achieve higher degree of immersion and even has the chance to combine them with 3D virtual reality in order to develop virtual systems with a closer approach to the real environment
Summary
The interfaces between a human operator and a machine are the human senses. Sight and hearing have been explored for decades based in video and audio. As haptics are modern devices integrated in emergent technologies used in many areas it is relevant to introduce the concept to the younger at an early stage. Those devices present high costs while offering a degree of sophistication that largely exceeds the needs for simple educational applications. Their performance capabilities are, related with high cost. Among their characteristics the number of degrees-of-freedom (DOF) is, often, higher than what is required for simple applications.
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