The main objective of this project is to create a low-cost integrated device for the measurement of sound levels at a given distance from vehicles, that is, to help the Motor Vehicle Department (MVD) enforce rules against modified exhaust systems. At the moment, measurements of sound levels are mostly carried out at random distances, most of which are too close to the exhaust pipe, and hence produce sound readings that are highly exaggerated. Not only does this lead to erroneous evaluations but also unnecessarily incurs fines on the owners of the vehicles. The suggested solution therefore tackles this crucial problem by making sure sound levels are properly measured from a fixed distance of 7.5 meters, hence encouraging adherence to noise rules
According to legal norms, exhaust noise needs to be measured from a uniform field-free distance of 7.5 meters. But in real life, officers measure sound at a much shorter distance because there are no reliable tools used for measuring distance, leading to incorrect readings and high fines. To mitigate this, the system incorporates a TF Luna LiDAR sensor for accurate distance measurement and a MAX4466 analog microphone for sound intensity estimation. The measurements are calculated by employing an ESP32 microcontroller and are shown real-time on a 0.96-inch OLED display, enabling the user to see both parameters at the same time.
The MAX4466 sensor detects changes in environmental noise and converts such changes into electrical signals, which the ESP32 interprets to determine levels of noise. At the same time, the TF Luna LiDAR detects object distances based on time-of-flight infrared pulses. The ESP32 interprets data from both sensors and displays it in real-time, thereby allowing users to receive real-time information about environmental conditions