https://www.robotshop.com/community/tutorials/show/how-to-make-a-robot-lesson-3-making-sense-of-actuators
https://www.robotshop.com/community/tutorials/show/how-to-make-a-drone-uav-lesson-2-the-frame
http://archive.fabacademy.org/fabacademy2017/fablabvigyanashram/students/53/assignments/Assignment10/index.html
http://www.robotplatform.com/knowledge/sensors/types_of_robot_sensors.html
https://herlaar.net/b3it/b3it-kit/sensors-and-actuators/
