This research aims to present the characterization of a fuel cell that generates HHO hydroxy gas; for this we will use the following methodology that conforms to the scientific method. Initially, we propose to determine the HHO gas generation based on the change in temperature and current of the cell through the following scheme: first, a fuel cell will be designed to generate the hydroxy gas; later, a PWM controller will be designed to control the current to measure the temperature. A thermal camera will be used to extract the temperature curve. The experimentation will allow us to demonstrate the direct relationship between the production of HHO gas and the current, and affectation that occurs according to the amount of electrolyte gas (NaOH). We will also show how a controller that regulates the production of HHO gas was designed and built at a very low cost in an innovative way, verifying with this work that it is possible to develop a basic control system to characterize a fuel cell by varying the current and temperature and demonstrate once again that the implementation of engineering can solve local and global problems. Keywords: HHO, Fuel Cells, Hydroxy Gas, Hydrogen, Characterization DOI： https://doi.org/10.35741/issn.0258-2724.58.3.23