The idea was to establish one threshold for each person because there are people who are more nervous than others, so there could be cases where the results are not reliable. In order to verify the stress sensor, we carried out different trials with 16 adult subjects. This means of communication has been used before in healthcare applications, as can be seen in and. It is possible to connect as many as 255 nodes. There are two main reasons why we decided to work with ZigBee: Therefore, the coordination center could use different systems to help the person relax, such as turning down the lights or changing the kind of music the user is listening to. The final user could manage the different devices from his television and the control center could take different action so as to change a person's stress levels. By using a wireless communication system, the user is provided with a certain degree of freedom when using the device. The user can use the stress sensor anywhere in his home provided he is at a distance of less than 10 meters. The Figure 1 shows the communication of the final application. The final objective is to implement this GSR into an application which controls different medical devices. This device sends different data to a coordinator via ZigBee and, at the same time, this coordinator will send the information to a computer. It uses just two electrodes which are placed on the fingers and act as if they were the two terminals of one resistance.
Therefore, it is necessary to build a device to detect stress.įor this objective, we have designed a Galvanic Skin Response (GSR) device in order to detect the different conductance of the skin when a person is under stress or when not. In some cases it is necessary to collect feedback in order to control this symptom because it can become dangerous in certain situations. These hormones rouse the body for emergency action. When we perceive a threat, our nervous system responds by releasing a flood of stress hormones, including adrenaline and cortisol. It is the way our body prepares itself to face a difficult situation with focus, strength and heightened alertness. Stress, better explained in, is a response to particular events.
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