<p>Nowadays, the energy industry is experiencing rapid development. Excellent quality and durable power supplies have been developed under scientific research. The preparation of battery materials has an impact on the environment and humans. Thus, in the battery test process, the gas data index in the test environment is important.&nbsp;</p><h3 class=""><u>Keywords</u>: battery testing workshop, OLED screen, Dupont line, gas data,<span style="font-weight: 700;">&nbsp;</span>circuit&nbsp;</h3><p><br></p><p>In a battery testing workshop, researchers developed an Air Quality Monitoring system. Features of this system are:</p><ul><li>Wide application range</li><li>Excellent performance&nbsp;</li><li>Cost-effective</li><li>Convenient maintenance</li></ul><p><b>System design:</b></p><p>The system design of the main program flowchart is mainly composed of system initialization, the setting threshold of each gas parameter range. It is done through a WIFI module for transmitting data to the cloud platform. The data is displayed on an OLED screen. The following flowchart shows the complete steps in system design:</p><p><br></p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<img src="/media/django-summernote/2022-11-09/53dbf355-f1bf-4d61-ab9a-4dc7a5c0e1a4.png" style="width: 353.497px; height: 430.045px;"></p><p><br></p><p><b>Hardware circuit design:</b></p><p>The system uses STM32F103C8T6 as the core master chip. Hardware components of this system include a WIFI module, related sensor module, OLED display module, Ventilation module, and sound, and light alarm module.</p><p><span style="font-family: Helvetica;">The gas acquisition module of the system adopts an MQ-7 carbon monoxide sensor to collect carbon monoxide concentration, a DHT11 temperature and humidity sensor module to collect temperature and humidity, a GP2Y1014AUOF PM2.5 dust sensor to collect gray layer concentration, a photosensitive resistance sensor to collect luminosity, and OLED screen display module to display data.</span><br></p><p><b>Debug and analyze</b>:</p><p>The Dupont line is used for connections. The corresponding connection between each module and the main control chip is built on the breadboard. The multimeter is used for measuring the circuit and its working and performance.&nbsp;When the circuit requirements are fully met, the program is written into the chip through KEil 5. Then it is powered on.</p><p>First, the OLED screen is observed to ensure the results are correctly displayed. For analyzing the proper working of the circuit, some environmental parameters can be changed.</p><p><br></p><p><b>Conclusion:</b></p><p>This system will help users to monitor the relevant gas data in the environment. The system will alarm and respond in real time according to the abnormal gas in the environment. This system will surely help people in the scientific, industrial, and technological sectors.&nbsp;</p>