转速计（转数计数器）
Tachometers (also known as revolution-counter sensors) can be used to measure the rate of rotation turning vehicle parts like rotors, engines, or wheels.
INFO
Currently PX4 just logs RPM data: it is not used for state estimation or control.
本节列出了 PX4 支持的转速计传感器（更详细的文档点击链接）。 下面链接的主题（和侧栏）提供了更详细的设置和配置信息。
