Arduino pinouts arduino mega pinout4/5/2024 In the case of MQ-2, chemisorption is the process in which the gas molecules surrounding the sensor interact with its surface material and cause a change in the electrical resistance. "Chemisorption is the process by which the molecules of the material adhere to the solid surface because of the chemical bonding." Here is the detail of each part, and we’ll discuss the working principal using the following structure:Īs mentioned before, the MQ-2 smoke/gas detector works on the principle of chemisorption. The working principle and characteristics of the MQ-2 are easily understood by studying the internal structure in detail. These may include Where to Buy MQ-2 Smoke/Gas SensorĪlong with millions of other products, sensors like MQ-2 smoke/gas sensors are available at the following platforms: In addition to all these, the MQ series has multiple members that are widely used in place of MQ-2. Laser-based gas detectors, Infrared (IR) gas sensors, and photoionization detectors (PIDs) Sensirion SPS30, Shinyei Figaro TGS822, and Amphenol NovaSens SCS series The details of each pin are given next:įigaro TGS series, Sensirion SGP series, Amphenol NovaSens SC series Here, one must know that the DOUT pin is not always present, but some models do not have it, and in such cases, the analogue pin AO is the output pin. The pin arrangement may vary depending on the model. The MQ-2 smoke/gas sensor has four pins, as shown below in the image: If you want to know more details about the datasheet, then here is the link to it: MQ-2 Smoke/Gas Sensor Pinout Configuration Here is the graph that shows the details: The sensitivity material is affected not only by the type of gas but also by other parameters such as humidity and temperature. Based on the multiple experiments and the specification, here is the sensitivity graph for the MQ-2 smoke/gas sensor: The sensors can detect multiple gases, and the sensitivity of the resistive material is different for all of them. Here is a table that provides the basic details of the MQ-2 smoke/gas sensor: The datasheet has multiple characteristics, and some of these are mentioned below: Basically, it consists of the tin dioxide (SnO2) semiconductor gas sensor, a comparator (using the op-amp), and necessary supporting components.īefore using any electrical component, it is important to study its datasheet. This sensor is particularly suitable to detect combustible gases, smoke, and other pollutants. The list of gases this sensor can detect is given next: Hence, when using the MQ-2 in the circuit, it can detect multiple gases and provide the digital values of change in the gases at its output pin. We know that MOS sensors are known as Chemiresistors because there is a sensing material in them that works based on the change in its resistance when it is exposed to the reactive gas. The MQ-2 is a metal oxide semiconductor (MOS) gas sensor and one of the most widely used sensors in the MQ series. ![]() ![]() This is going to be a detailed article on the MQ-2 sensor, so let’s get started. Moreover, we’ll try to figure out the workings and applications of this sensor in different domains to understand the core concept. Moreover, we’ll know its pinouts in detail and will see some important circuit diagrams. In this article, we are going to discuss the basic introduction of this sensor in detail, along with the datasheet. Mostly, it is used in Arduino projects where it senses the gas and the information is fed into the Arduino to allow the circuit to work according to its digital output. These sensors come with an operational amplitude comparator and a digital output pin therefore, they have applications in multiple fields of life. When it comes to detecting or measuring smoke or gas, the MQ series gas sensors are widely used components in circuits. Today, we are learning about an important member of the gas sensor family, which is the MQ-2. Hello learners! I hope you are doing good.
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