http://arduinobot.pbworks.com/w/page/10175779/Motores%20DC
https://naylampmechatronics.com/blog/53_robot-movil-controlado-por-bluetooth.html
http://www.iescamp.es/miarduino/wp-content/uploads/2016/03/Arduino-BT-1024x534.jpg
https://arduino.stackexchange.com/questions/55566/not-declared-in-this-scope-error-message
https://cdtechnologia.net/sensores/295-shield-l293-control-de-motor-para-arduino.html?SubmitCurrency=1&id_currency=3