*3.3. Hardware*

For the temperature system, a thermal display that was developed for prior research was used [7]. The system consisted of an array of Petliers, which is a device that releases heat on one side and absorbs it through the other one when electric current passes through it. All the Petliers are driven by a dual H-bridge board controlled through an Arduino Mega microcontroller. Figure 1 shows the array of Petliers that was used during testing. An array of petliers was used in order to be able to set each petlier at a different temperature from the beginning, so the test could be perform faster. The temperature range of each petlier was from 10 ◦C to 40 ◦C.

**Figure 1.** Peltier array temperature device and controller (Adapted from ref. [7]).
