The paper proposes a method to implement Tire Pressure Monitoring System (TPMS) in vehicles. TPMS measures the air pressure inside pneumatic tires of automobiles. The proposed TPMS has an electronic unit that directly screws onto the stem of tire. The unit includes a pressure sensor and switch, signal conditioning unit, microcontroller, RF transmitter and long life battery. An onboard RF receiver communicates with the TPMS unit and displays real-time tire pressure of all tires. The unit can be easily detached and re-attached to the tire. Modification to the tire is not required. The system and each TPMS unit have unique ID code to prevent false data reception from neighbouring vehicles. Tire replacement or maintenance will not affect the system's working. Warning is generated whenever tire pressure crosses the maximum or minimum safe pressure level, or when it changes abruptly. This lower level and upper limit of tire pressure or safe range of abrupt change can be modified by user through the user interface. The system has been implemented on a car. It has given accurate results while proving to be user friendly.

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