Sound sensors are typically microphones that detect and return the equivalent voltage of sound. A basic robot can navigate the sound it hears. Consider a robot going right to approach a pulpit, then turning left for two palpitations. For voice recognition, complex robots may use the same microphone. Sound sensors are more difficult to implement than light sensors because they create a small voltage difference that must be amplified to achieve a noticeable change in voltage. Speech systems also employ robots that respond to voice commands. When teaching robots, this is important if the trainer must handle other things.
