Structural health is important especially in older bridges that were designed without earthquake resistant design. Therefore, it is proposed to use wireless accelerometers with environmental temperature and humidity sensors, using a total of 6 Arduino Due sensors distributed along the bridge segments. In addition, Raspberry Pi boards linked to a laptop are implemented to facilitate monitoring of the structure. Also, a modal analysis was carried out to obtain the frequencies, the first and second modes of vibrating correspond to frequencies of f_1 = 1.15 Hertz and f_2 = 1.55 Hertz, and with a damping of 5% that helps to choose the location of the sensors. This approach provides valuable information about the health of the bridge, allowing early detection of potential problems or anomalies. On the other hand, the prices of a used sensor are compared with a commercial sensor. It is shown that choosing low-cost accelerometers instead of commercial sensors can significantly reduce costs, saving between 59 and 83%. This optimization not only seeks efficiency in structural monitoring, but also more economical and effective management of bridge infrastructure. The research comprehensively addresses the implementation of a structural monitoring system, from the selection of sensors to the strategic location on the bridge, underscoring the importance of economic efficiency in the management of the structural health of bridges in Peru.