The ground of the MQ135 Gas Sensor is connected with the ground of the Nodemcu module, the AOUT pin is connected with the Analog pin A0 of the Nodemcu Module, and VCC is connected with the 3.3 volts pin of the Nodemcu ESP8266 Wifi Module.

The output of the voltage regulator is connected with the Vin pin of the Nodemcu ESP8266 wifi module and the ground is connected with the ground. A 330-ohm resistor is connected in series with a 2.5v led. Two 470uf capacitors are connected at the input and output sides of the voltage regulator. J1 is the female power jack and this is where we connect a 12v adaptor, battery or a solar panel. The Power Supply is based on the famous LM7805 voltage regulator. This project can be divided into three sections, the power supply, the Nodemcu ESP8266 wifi Module, and the MQ135 Gas Sensor. As you can see the circuit diagram is very simple. This is the complete circuit diagram of the IoT based Smoke detector system. MQ135 Pinout:Īs you can see, the MQ135 Gas Sensor has a total of 4 male headers, which are clearly labeled as GND, DOUT which is the digital output, AOUT which is the analog output, and VCC. This sensor is most commonly used as the Air Quality monitor. You can use this sensor with Arduino and Nodemcu ESP8266 Wifi module. To power up this sensor you need 2.5V to 5 volts, which is perfect.

The sensitivity can be adjusted very easily using the blue color variable resistor. This sensor is famous for the fast response and recovery. The output voltage of this sensor increases as the concentration of the gases increases. This is the MQ135 Gas Sensor which is quite sensitive to Benzene, Alcohol, and Smoke. I would appreciate your support in this way! I may make a commission if you buy the components through these links. Without any further delay, let’s get started!!!

Nodemcu ESP8266 Wifi Module Programming.

The PCB board Gerber files can be downloaded from the PCBway official website. The PCB board used in this project is sponsored by the PCBway Company which is one of the top leading companies throughout the world. When the sensor value crosses a certain pre-defined value a notification message is sent to the concerned person.

The sensor value can be monitored in real time from anywhere around the world. IoT Smoke Detector- In this tutorial, you will learn how to make an IoT based Smoke Detector system using Nodemcu ESP8266 Wifi module, MQ135 Gas Sensor and Blynk application. IoT Smoke Detector Program explanation:.IoT Smoke Detector Nodemcu ESP8266 Programming:.MQ135 Gas Sensor Interfacing with Nodemcu ESP8266:.Download the Eagle PCB board layout file: nodemcu esp8266 power supply pcb board.

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