Maintaining appropriate tyre pressure is an important part of vehicle safety, tyre service life, ride behaviour, and energy consumption. Conventional pressure maintenance normally requires the vehicle to be stopped so that the tyre can be checked and adjusted with an external inflator or air source. This work presents the design and fabrication of an automated air inflator and deflator system intended to regulate tyre pressure with reduced manual intervention. The proposed system combines a pressure sensor, Arduino Uno microcontroller, 12 V DC compressor, solenoid-operated air-release path, pneumatic tubing, rotary pneumatic connection, relay-based actuation, and an LCD indication unit. The measured tyre pressure is compared with lower and upper set limits. When pressure falls below the lower limit, the controller activates the compressor to supply air to the tyre. When pressure exceeds the upper limit, the controller disables the compressor and actuates the solenoid valve to release air until the pressure returns to the permitted range. A prototype-level implementation was developed for a single tyre because of limited component and funding availability. The work focuses on the integrated mechanical, pneumatic, electronic, and control architecture and establishes a basis for later extension to four-wheel operation, wireless sensing, and vehicle-level integration.

Index Terms— tyre pressure control, automatic inflation, automatic deflation, pressure sensor, Arduino Uno, pneumatic rotary air connection.