What is an Ultrasonic Sensor?

     Ultrasonic sensors use sound waves to measure the distance to an object. The sensor emits a sound above the hearing range of humans, around 20 kHz, and listens for the sound after it bounces off a surface. The ultrasonic sensor I am using in the video is a transceiver, because it can send and receive ultrasonic waves. 

 

What is a Servo?

     A servo is a small motor that can be programmed to rotate a certain number of degrees at a set speed. A “continuous” servo can spin 360 degrees, while a normal servo can spin almost 180 degrees. On a normal servo, the angle of rotation and the turn speed can be adjusted. On a continuous servo, only the direction of rotation and speed can be adjusted. Servos use magnets (brushed) or a magnetic field and electricity (brushless) to determine their angle of rotation. The servo I am using in the video is a normal servo.