The variation of the consumed electric energy by an electrochemo-mechanical triple layer actuator (polypyrrole film/non-conducting and adhesive film/polypyrrole film) can be used as sensor of the physical or chemical variables controlling the electrochemical reaction. Amongst others, the electrolyte concentration and the temperature of cell can be sensed. A physical variable that not participates in the electrochemical reaction, as the trailed weight by the triple layer during a bent can also be determined. The electric energy consumed during a constant movement of the triple layer changes linearly as a function of these variables. So, this artificial muscle works as an actuator and sensor simultaneously. This macroscopic muscle with sensing and actuating capabilities only require two wires connecting equipment and the device.