**4. Architecture of a sensor node**

Advances in miniaturization have enabled sensors to integrate several modules despite their relatively small size. They mainly consist four (4) units [14, 17, 18]:


In addition to these, we can find depending on the field of application of the sensor network, a unit for localization, the unit for movement, and sometimes the unit for producing energy thanks to small solar panels. The diagram in **Figure 4**

shows all of these different modules. In our case, let us dwell on each of these modules in more detail [5, 6, 9, 14].

