How does direct TPMS communicate with a car?

Direct TPMS directly measures tire pressure using hardware sensors. In each wheel, most often on the inside of the valve, there is a battery-driven pressure sensor that transfers pressure information to a central control unit which reports it to the vehicle’s onboard computer.

The below image is of a Direct TPMS Sensor

Source — TPMS Sensor Technology for smart tyres — TREEL Mobility

Some units also measure and alert the temperatures of the tire as well. These systems can identify under-inflation for each individual tire.

Although the systems vary in transmitting options (eg- Bluetooth, etc), many TPMS products (both OEM and aftermarket) can display real-time, individual tire pressures whether the vehicle is moving or parked.

I have been using TREEL TPMS for 2 years, it’s a comprehensive Tyre Protection & Maintenance System. TPMS sensor not only measures your tyre pressure and temperature, but it also alerts me to the smallest pressure leak, while helping in maintaining my tyre and vehicle, ensuring maximum performance, safety and savings.