They measure physical variables such as pressure, acceleration, yaw rate, flow rate, and gas composition. MEMS sensors (micro-electro-mechanical systems) are tiny little high-tech helpers.
There are up to 50 MEMS sensors in a modern car. A yaw-rate sensor that records the rotary movements of the car around its vertical axis is at the heart of the ESP® electronic stability program.
However, these structures that often measure only thousandths of a millimeter are no longer just used in automotive technology. In consumer electronics, they are used in smartphones and laptops. In smartphones, for example, MEMS sensors can recognize how the screen is oriented while the user is typing a text message. They also control microphones and reduce background noise.