## 2 Materials and Methods
### Autonomous Photovoltaic Installations. Before proceeding with the installation of the autonomous stations used for the monitoring of fauna of the place and lighting and supply of energy charge, we proceeded to identify several strategic points in different trails of the forest (initial selection of 20 points), later it is allowed to discriminate through the assessment of; existence of satellite signal (WIFI), solar radiation of the place, biodiversity of species, road conditions, and damage caused by tourists. It should be noted that the selection of the points for the installation of photovoltaic cells, irradiation measurement (W/m\({}^{2}\)) was performed during four months [7; 8; 9]. From this analysis, 6 places were considered as suitable for the installation of autonomous stations. Subsequently, the environmental diagnosis, soil study and a more exhaustive study of the flora and fauna of the place were made. Of the 4 points along the trail, one was eliminated because the presence of a teak forest, deciduous trees that generated too much shade to obtain an important irradiation intensity [10]. Another point was removed due to the presence of a \"CEIBO\" tree that could generate too much shadow. This point was moved down hill to a location where there appeared to be no obstacles for solar radiation. Following the procedures indicated, irradiation measures were performed at the 4 end points of the trail, as well as at the viewpoint. It could be considered that on a sunny day there will be no problems to obtain the irradiation intensity required to generate the desired power using photovoltaic panels [11]. On the other hand, during cloudy days' low measurements were obtained, which would not generate enough power in the solar panels. Considering that the measures were taken between late May and early July, at the end of the rainy season, there would still be cloudy days with little intensity [12; 13]. For the next months, outside of the rainy season, there are expected to be far fewer cloudy days, and the panels will be able to deliver the required power very often. In Figure 1 we show the study area of the protective forest trail. Finally, we installed 3 autonomous stations each of 50 W (point 3, 5, and 6) a station of 200 W in the viewpoint \"Mono Aullador\" (point 1) and a station of 200 W in the buffer zone of the forest (Sustainable home). On the other hand, it is necessary to indicate that the design and construction of the autonomous stations have been developed applying the sustainability approach and reuse of materials for the structural part of them. The stations are designed to guarantee the energization of the audio information transmission system, lighting through a control system that constantly illuminates the path around 2 h at night and, in addition, allows charging smaller equipment such as telephones, cameras, among other items. The design of the autonomous installations, part of the structural analysis using the \"Inventor\" software, were carried out general plan of the construction with its proper elements (construction material beams M1). After this, the process of cutting, polishing, welded and bolting of the structure was carried out, it should be noted that the materials used are recycled, subsequently, the structures were installed in the 4 selected areas (Figure 2). Finally, the installation of the photovoltaic panels and their complements was carried out. [14,15]. Figure 1: Location map of the autonomous stations. Figure 2: Autonomous stations of 50 W. Sendero “Mirador” Escuela Superior Politécnica del Litoral (ESPOL). On the other hand, the autonomous system was installed arduino microcontroller, (allows by programming, to be able to manage and control different devices, in a simple and fast way) for the control of the current and voltage delivered by the photovoltaic panel. In addition, for the lighting of a 10 W lamp, which must be lit for 2 h during the night (18:00-20:00 pm), to benefit hikers or visitors.