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The tyre pressure monitoring system is an electronic unit mounted inside every conveyance tyre to control the air pressure and to transmit the correct warning signal to the driver. The health of their conveyance tyres is not considered by most people. However tyres, which require safety maintenance, are one of the most important components of a conveyance. The friction between the road and the tyre increases as the car travels on the road. Due to rugged roads, rigorous driving, terrible road conditions, this friction increases. This impacts the vehicle's reliability and average. Because of this, sudden tyre failure causes serious crashes, especially when a car is driving at high speed on the highway. This will mitigate injuries caused by low or flat tyre air pressure. This would increase the fuel efficiency, the life of the tyre and reduce the tyre's wear & tear. This is critical for long-driving vehicles, such as the conveyances used as carriers of goods, passenger conveyances and other conveyances that run regular and long-distance.
The pressure level on the conveyance dashboard is currently seen by TPMS, but there is no way to remotely monitor the tyre status. In the present work, To solve this problem, a wireless MQTT-based system was built that transfers data to the mobile app so that tyre health can be tracked remotely from anywhere in the world. The Node MCU Wi-Fi facility and the Firebase web facilities have made it easy to incorporate such TPMS remote monitoring.
The block diagram of the setup device is shown in [
It comprises
Node MCU
MLX90614 temperature sensor
SPD030G pressure sensor
The pressure and temperature are linked to node MCU. The data from both sensors is received and processed by the Node MCU. The Node MCU sends the data via Wi-Fi connection to the firebase. Data is collected on the device and seen in the mobile app with the assistance of appropriate firebase account authentications.
Firebase has many cloud services that range from web application hosting, authentication, storage, and cloud features. There are two facilities used in this article: Real-time Database and Hosting. Firebase provides a hosting service that can be used instead of maintaining the server and struggling with settings for deployment and networking to house the software. It is free (yet limited) and relatively easy to use. Firebase is a platform developed by Google that is used to create mobile and web applications.
MIT App Inventor is an integrated development environment for a web application. It uses a graphical user interface (GUI) that is somewhat similar to the Scratch (programming language) and StarLogo programming languages, allowing users to drag and drop visual objects to create an app that can run on Android devices while being an App-Inventor Companion (The software that sanctions running and debugging the app) that runs on IOS running devices is still being developed.
With the assistance of Eagle Software, a circuit diagram is developed. Pin connections of components as seen in the following [
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The experimental set-up is shown in [
The MLX90614 is a temperature sensor based on infrared technologies for measuring non-contact temperatures. It can measure temperatures within the range of -70 to 380 degrees Celsius at room temperature with a precision of approximately 0.5 C. MLX90164 has a lens in front of a detector that focuses on the infrared radiation produced by the sample. The detector transforms the energy into an electrical signal to be translated and transmitted to the firebase by the NodeMCU.
The above [
An easy and user-friendly creator of mobile apps is the MIT App Inventor. It facilitates connectivity between firebase and mobile. With a long page, the safe and user-friendly software creates a proper dashboard. Whenever the value changes on the respected firebase values are collected by the app inventor and shown in the respected value field as seen in [
In comparison to others, for sensor readings and Wi-Fi connectivity, we have used a single processor that reduces the expense needed for two separate processors. This leads to a decrease in the size of the hardware too. With the help of the MLX90614, without actual physical contact, we can calculate tyre pressure. The same sensor will simultaneously detect the ambient temperature.
In this study, tyre pressure monitoring systems using NodeMCU, AD623 and MLX90614 are presented. To link the sensors and also for wireless communication, it is best to use NodeMCU. Because of the low power consumption of the processor and all sensors, the entire device is ideal for operating on a small DC voltage battery (3.7v/36000mA). Firebase is used as a server view and mediator between a proposed device and a mobile app.