## 3 Material and Methods  
The aim of the article is to find connections between the possibilities of individual devices connected to the Internet (i.e., IoT, eye tracking technology) and the student's concentration influenced by physiological conditions. The experiment was performed on a sample of students who had to answer as many questions as possible in 3 min. The time was set empirically so that the time quantum allocated to answer the questions evokes competition among students and thus indirectly the middle situation and the change (expected increase) of HR. The relationship between stress and HR has already been described by the authors in their research [3; 4]. A smart wristband was used to monitor the participants' physiological conditions, measuring their heart rate. Correct answers and overall control were indicated by using eye tracking technology. The task of the research was to find the dependence between physiological functions (with which we can identify stress and calm condition) and the results of students' knowledge, i.e., how concentration and heart rate affect the overall result of students. We are looking for dependencies between the results of eye tracking technology, HR and their impact on students' knowledge. The testing methodology consisted of several steps:  
1. Create a quiz--LMS Canvas was used to create the quiz activity;
2. Create a question bank in the quiz--The created question bank contained 40 questions, consisting of four categories, which are described in the continuation of the chapter;
3. Choosing a wristband capable of measuring heart rates--The choice of smart wristband consisted of a comparison of several manufacturers with a licensed device for use in medicine;
4. Smart Watch Sensor Setup--each student had a wristband calibrated according to the manufacturer's recommendations;
5. Adjust the eye tracker sensor--calibration of the device on the Tobii EyeX Eye Tracker was performed for each student according to the manufacturer's instructions;
6. Start quiz with a predefined time--The quiz time was set at 3 min, in order to indirectly induce stress and competition for students to achieve the highest possible rating. For time synchronization, the same times were set for both sensors, and at the same time after starting the quiz, heart rate measurement was started, as well as eye tracking. At the same time as quiz activity was stopped, heart rate measurement and eye tracking were stopped;
7. Quiz evaluation--A log from Canvas was used to evaluate the quiz, where the steps of completing the quiz were analyzed in detail;Export the wristband data--The data obtained from the watch was automatically sent to the mobile device and then to the cloud;
* Evaluation of exported data--the obtained data were synchronized with each other based on the setting of the same time for both sensors, while the heart rate is a connected function and eye tracking is a discrete or separate function. Before synchronization, the times were adjusted to Unix time for all sensors;
* Interpretation of results--the results of the experiment are described in more detail in the Results chapter. This section describes how the eye tracker can be connected with smartwatch from Apple (Apple Inc., Cupertino, CA, USA) for the purpose of analyzing students' heart rate. Students from the University of Novi Sad did online quiz on Canvas. Canvas is an online tool for teaching and learning. Instructors on Canvas can share course content, post assignments and grades, conduct quizzes and collect online submissions. It was developed by Instructure Inc. in order to support the continued development of a new learning management system (LMS). The aim of this experiment was to measure and compare students' heart rate, which were gained from Apple Watch devices. Students attempted to answer the quiz, and they needed to answer as many questions as they could in a period of 3 min.