Please note that we are not dealing directly with the ppm.
#HOW TO CALCULATE PPM FROM MQ135 CODE#
After that, our code has to work on getting the input from the sensor, and then it must display the data on the webpage, which is created using nodeMCU. To write the code for this IoT pollution monitoring project we are keeping in mind that first, our code has to connect the local area network by using the credentials provided in the code. Here we are using the Arduino IDE to write the code. IoT Air Pollution Monitoring System: NodeMCU - Arduino Code Explanation
The remaining connection for the Lcd to nodeMCU are as follows:Ĭonnected to the positive supply terminal of the power railĬonnected to the Ground supply terminal of the power railĬonnected to the ground terminal of the power rail.Ĭonnected to the positive supply of the power railĬonnected to the D0 terminal of the nodeMCUĬonnected to the ground of the power rail Note: Potentiometer’s fixed ends are connected to the positive and ground rail of the breadboard, and its variable end, is connected to the 3rd pin(pin VEE) of the LCD (16X2). The VCC and GND pin of the MQ135 gas sensor, is connected to the positive and negative rail of the breadboard. The Vin pin and GND pin of the nodeMCU are connected to the power rails of the breadboard, as shown in the below diagram. The connections for the MQ135 gas sensor module and 16x2 LCD are shown below. IoT Air Pollution Monitoring Circuit Diagram The internal circuit of the MQ135 gas sensor is shown below. Their connections will be shown in the circuit diagram section. The MQ135 sensor module contains four pins Vcc, GND, D0, and A0. As I am having the module format of the MQ135 sensor, I'm using this module in this project. To find the ppm or to get the analog value, we will be using the A0 pin. The difference between them is that the module format sensor contains an extra pin D0 along with an A0 pin, which gives only digital value. The MQ135 gas sensor is available in two formats, one in only sensor format and the other in module form. A heater coil that is made up of Ni-Cr alloy, is used to provide the necessary working conditions for the sensor to work. An electrode and electrode line of materials Au and Pt is present in the MQ135 sensor. To sense the gases, the MQ135 sensor contains a gas sensing material that is made up of SnO2. The MQ135 sensor is like a variable resistor, whose resistance depends on the gases surrounding it. The page will be refreshed for every time interval to show the updated values.
#HOW TO CALCULATE PPM FROM MQ135 PASSWORD#
Later on, we will connect the nodeMCU to our LAN, by providing the SSID and password credentials and then we will be generating a webpage where we send the sensor data.
Later we will be building an air pollution monitoring system using nodeMCU and MQ 135 gas sensor and interface an LCD (16X2) display to nodeMCU, to show the pollution content value. In this project, at first, we will be knowing about the MQ135 sensor and its internal circuit. The circuit consists of a simple connection and takes fewer components to have your own IoT based air pollution monitoring system. Here in this project we are going to use MQ135 gas sensor to sense the pollution content in the surrounding area and then to monitor these values over the Webpage. There are different types of gas sensors to detect different gases.
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