https://github.com/RodrigoSturm14/Sensores-Sharp-2Y0A02
https://github.com/FullSensores/Sharp-2Y0A21-2Y0A02Y-Arduino
https://github.com/Martinsos/arduino-lib-hc-sr04
https://arduproject.es/medir-distancia-con-arduino-y-sensor-de-ultrasonidos-hc-sr04/