Perancangan Alat Pendeteksi Kadar Polusi Udara Menggunakan Sensor MQ-2 dan MQ-135 dengan Teknologi Wireless HC-05

Abstract

Air pollution is a condition of air that has physical, biological and chemical substances in the air layer on earth (atmosphere) so that it can be harmful to human health and natural resources. When air pollution gets higher and accumulates, it will result in the death of living things. A detector of pollutant levels in the air has been designed, including carbon dioxide gas (CO2) using the MQ-135 sensor, Carbon Monoxide (CO) gas using the MQ-2 sensor, and temperature detector using DHT-22, the information obtained from the sensor will be sent through the Bluetooth module HC-05, while the Central Processing Unit (CPU) used in this design uses ATMega328. In designing this tool, first turn on the tool. Then do the data initialization. After initializing the data, the Central Processing Unit (CPU) automatically orders the sensors to take measurement data according to their respective functions. The information that has been obtained from the sensor will then be processed by the CPU which will be processed and sent in the form of a digital signal to the LCD via I2C and the LCD will then display the converted digital information via I2C, at the same time the CPU will also send information via bluetooth to android, the information received by this android will automatically be responded to and displayed by the Blynk android application. The average levels of air pollution produced are 468.5 ppm, 561 ppm, 684 ppm, 702.65 ppm, and 530 ppm. Then the average temperature is 24℃, 24℃, 26℃, 28℃ and 24℃. The results of the validation of the percent deviation on the design tools and standard tools have a calibration value of 5.018%. So it can be concluded that the sensors used in this tool work accurately on average to detect levels of air pollution and temperature. The design of this tool also includes the use and improvement of Arduino. This tool is also more practical because it uses bluetooth HC-05 so that it can also be displayed on Android, thus helping the public to know the value of air pollution levels to create good and healthy natural resources.