The Giant magnetoresistance (GMR) effect has been presented as a highly viable current measurement alternative in electrical systems due to its low cost, versatility and high precision. This paper shows how the GMR effect can be used in current measurement in smart grids. The study contributes to the construction of a current measurement prototype which works by using the GMR effect. Subsequently, a data storage and processing server is created using a Raspberry Pi. Finally, a graphical interface capable of real-time monitoring of the data acquired by the sensor is designed and implemented. Different tests were carried out successfully, showing not only the viability of the GMR sensor as a current meter, but also the possibility of using other tools as a complement in order to create a product of great utility in intelligent measurement of smart grids.