466.IoT Based Air Pollution/Quality Monitoring with ESP8266 With the help of an ESP8266, a PM2.5 particulate matter sensor, a MQ-135 air quality sensor, and a BME280 barometric pressure sensor, we are going to create an Internet of Things–based air pollution and quality monitoring system. Through the use of the internet, we will keep an eye on the Air Quality on the Thinspeak Server. This is a basic prototype for an Internet of Things (IoT) Environmental Air Pollution/Quality Monitoring System that will monitor the concentrations of the most significant air pollutants. The PMS5003 PM2.5 Particulate Matter Sensor, the MQ-135 Air Quality Sensor, and the BME280 Barometric Pressure Sensor are the three sensors that are utilized by the system. Through this Internet of Things project, you will be able to monitor the level of pollution using your computer or mobile device from any location.

Plantpower's PMS5003 PM2.5 Particulate Matter Sensor is capable of determining the concentration of particles in PM1.0, PM2.5, and PM10. This MQ-135 Sensor for Air Quality measures the concentrations of gases such as CO, CO2, SO2, and NO2 and provides the results in parts per million (PPM) (Part per Million). In a similar vein, the BME280 can measure the Temperature, Pressure, and Humidity of its surroundings. The environmental sensors will collect data on a variety of environmental parameters and then transmit that data to the Thingspeak server, which will then display the data online at regular intervals of 15 seconds. We are able to install this system anywhere, and it has the capability to activate certain devices, such as an exhaust fan, if the level of pollution in the air reaches a certain threshold. A low-cost laser particle counter, the Plantower PMS5003 is one of a range of sensors made by Plantower that also includes the PMS1003, PMS3003, and PMS7003. PMS5003 is a type of digital and universal particle concentration sensor that can be used to obtain the number of particles that are suspended in the air, also known as the concentration of particles, and output them in the form of a digital interface. This can be accomplished by using the sensor to determine the number of particles that are suspended in the air. This sensor can be installed into variable instruments that measure the concentration of suspended particles in the air or other types of environmental improvement equipment in order to provide accurate data on the concentration of the substance in question at a given point in time. MQ-135 Air Quality Sensor The MQ-135 gas sensor is capable of detecting a wide variety of gases, including ammonia, nitrogen, oxygen, alcohols, aromatic compounds, and sulphide, as well as smoke. The MQ-3 gas sensor has a lower conductivity

than other gas sensing materials, which allows it to clean the air. Pollutant gases can be found in the atmosphere; however, the conductivity of the gas sensor will increase as the concentration of the pollutant gas rises. The MQ- 135 gas sensor is an option for use in applications that require the detection of smoke, benzene, steam, and other potentially hazardous gases. It has the capability of identifying a variety of hazardous gases. It has a low price point and is especially well-suited for applications involving the monitoring of air quality. The MQ135 sensor functions as an instruction for a signal output indicator. The analog output and the TTL output are both available from this device. TTL stands for transistor-transistor logic, and its output is a low-level signal that can be read through the IO ports of the microcontroller. The analog output is a concentration, and increasing voltage is directly proportional to increasing concentration. This means that the concentration can be determined by the analog output. This sensor has a long life and is stable and reliable throughout its operation.

BME280 Barometric Pressure Sensor Bosch's BME280 Humidity, Temperature, and Pressure Sensor is an integrated environmental sensor that has a very small size and uses very little power. It also measures pressure.

The readings of barometric pressure, humidity, and temperature can be easily measured with the assistance of this BME280 Atmospheric Sensor Breakout, which does not occupy an excessive amount of space. You can learn pretty much everything you need to know about the conditions in the atmosphere by looking at this one little breakout here. This module makes use of an environmental sensor that was produced by Bosch and includes a temperature and barometric pressure sensor. This sensor is an upgrade to the widely used BMP085/BMP180/BMP183 Sensor and belongs to the next generation. This sensor is fantastic for a wide variety of weather sensing applications and can even be used in I2C as well as SPI! This precision sensor from Bosch is the best low-cost solution for precise sensing, and it measures barometric pressure with an absolute accuracy of 1 hPa, and it measures temperature with an accuracy of 1.0 degrees Celsius. You can also use it as an altimeter with an accuracy of within one meter thanks to the fact that pressure varies with altitude and the fact that the pressure measurements are so accurate.

NodeMCU - ESP8266 PM2.5/PM10 Sensor - PMS5003 Air Quality Sensor - MQ-135 Barometric Pressure Sensor - BME280 Temperature, Humidity, Pressure Sensor Connecting Wires Breadboard Circuit Diagram: IoT Based Air Pollution/Quality Monitoring with ESP8266

The connection diagram or circuit diagram for the IoT-based air quality and pollution monitoring system can be found below. There is a total of three sensors, each of which is linked to the wifi chip NodeMCU ESP8266 12E. The PMS5003 Sensor uses UART Communication to function. There are 8 pins in total, and the counting starts from the right. Connect the VCC pin of Pin1 to the Vin pin of NodeMCU, and connect the GND pin of Pin2 to GND. The receiving (Rx) pin is the fourth one, and it is connected to the transmitting (Tx) pin on NodeMCU. In a similar manner, the fifth pin is known as the Tx pin, and it is connected to the NodeMCU Rx pin. MQ-135 is an analog sensor. Therefore, connect its A0 pin to the corresponding A0 pin on the NodeMCU. Join the VCC pin to the Vin 5V pin, and the GND pin to the GND pin. The BME280 Sensor is also included, and it operates using the I2C Communication protocol. Therefore, connect the SCL and SDA pins of it to the I2C pins of NodeMCU, which are D1 and D2.

In order to monitor the data from the Nodemcu ESP8266-12E online, we need to set up an account with Thingspeak. Go to https://thingspeak.com/ to set up your Thingspeak account. You will need to register for an account before continuing. When you have finished creating the account, you will need to make a new channel by providing the information requested in the image that follows.

Now copy the write API key, and make the necessary changes to the Arduino by substituting the API key that you copied. Online Monitoring of Air Pollution You will be able to see the following results by clicking on the serial monitor after the code has been successfully uploaded to NodeMCU. In a similar vein, you can go to Thingspeak and check out the private view to see the graph that is presented further down.

There is a more advanced version of the BME280 Sensor available called the BME680 Sensor. This sensor can measure Index of Air Quality (IAQ) in addition to Air Quality, and it can also be used to measure Air Quality. Therefore, the single sensor is sufficient to replace both the BME280 and the MQ-135.