MQ-135 Gas Sensor and OLED Display module both are powered with +5V and GND. The circuit is very simple as we are only connecting the MQ-135 Sensor and OLED Display module with Arduino Nano. The complete schematics to connect MQ-135 Gas Sensor with Arduino is given below: Circuit Diagram to Interface MQ135 with Arduino So to measure the appropriate CO2 concentration values, you have to replace the 1KΩ resistor with a 22KΩ resistor. But if you track your PCB traces to find the value of your RL in the board, you can see a 1KΩ (102) load resistor. The datasheet recommends that you calibrate the detector for 100ppm NH3 or 50ppm Alcohol concentration in air and use a value of load resistance (RL) of about 20 KΩ. According to the MQ-135 datasheet, the load resistor value can range anywhere from 10KΩ to 47KΩ. This resistor changes its resistance value according to the concentration of gas. The load resistor RL plays a very important role in making the sensor work. The circuit diagram for the MQ-135 board is given below: In this project, we are using an MQ-135 sensor module to measure CO2 concentration in PPM. MQ-135 sensor can either purchased as a module or just as a sensor alone. MQ-135 Gas Sensor is an air quality sensor for detecting a wide range of gases, including NH3, NOx, alcohol, benzene, smoke, and CO2. Useful when more than one module is used under SPI protocol Used for both I2C and SPIĭata pin of the module. The pins and its functions are explained in the table below:Īcts as the clock pin. You can also learn more about the basics of OLED display and its types by reading the linked article. It can work on three different communications Protocols: SPI 3 Wire mode, SPI four-wire mode, and I2C mode. OLEDs are using the same technology as televisions, but have fewer pixels than in most of our TVs.įor this project, we are using a Monochrome 7-pin SSD1306 0.96” OLED display.
A bright light is produced when an electric current is applied to these films. OLED (Organic Light-Emitting Diodes) is a self light-emitting technology, constructed by placing a series of organic thin films between two conductors. Apart from CO2, we have also measured the concentration of LPG, Smoke, and Ammonia gas using Arduino. The measured CO2 concentration values will be displayed on the OLED module and last we will also compare the Arduino MQ-135 sensor readings with Infrared CO2 sensor readings.
In this project, we are going to use an MQ-135 sensor with Arduino to measure the CO2 concentration. In our previous project, we used the Gravity Infrared CO2 sensor to measure the CO2 concentration in air. So CO2 level monitoring has also started to gain importance. Carbon dioxide is a key greenhouse gas and responsible for about three-quarters of emissions. The global average atmospheric carbon dioxide in 2019 was 409.8 parts per million and in October-2020 it is 411.29. The earth’s Atmospheric CO2 level is increasing day by day.
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