MQ131 Ozone Gas Detection Module For ozone gas (O3) Detector Module

7Semi BME688 Environmental Sensor Probe with Gas, Pressure, Temperature & Humidity Sensor The 7Semi BME688 Environmental Sensor Probe is a compact, AI-enabled environmental monitoring solution designed for precise measurements of temperature, humidity, barometric pressure, and gas levels. Built using the advanced Bosch BME688 sensor, it provides highly accurate, real-time environmental data that supports air quality monitoring, research applications, industrial automation, and smart home systems. Housed in a durable plastic shell, the probe ensures long-term stability while maintaining excellent breathability necessary for accurate gas sensing. This versatile environmental probe uses an I2C digital interface for easy integration with microcontrollers and embedded systems, making it suitable for both portable and fixed installations. With a wide operating range and low power consumption, it delivers stable performance even in harsh or fluctuating environments. AI-powered gas sensing adds advanced analytical capabilities such as IAQ scoring, VOC detection, CO₂-equivalent estimation, and bVOC outputs, making this probe a powerful tool for environmental diagnostics and air-quality-driven automation. Features: Provides simultaneous measurement of temperature, humidity, pressure, and gas concentration, enabling complete environmental assessment in a single compact device. AI-powered gas sensing detects VOCs, CO₂-equivalents, and various gases at ppb-level sensitivity for accurate indoor air quality monitoring. Durable plastic enclosure offers strong resistance to corrosion, dust, and temperature variations while maintaining high permeability for reliable sensing. Wide operational range ensures dependable performance from -40 to 85°C and 0–100% RH, suitable for both indoor and outdoor monitoring environments. Low power design supports battery-operated systems, making it ideal for portable, energy-efficient projects. Mini Round Shell (MRS) connector with a 1m cable provides secure and professional-grade installation flexibility. I2C digital communication interface simplifies integration with embedded systems and common microcontrollers. NIST-traceable factory calibration guarantees accuracy for industrial, regulatory, and research applications. Delivers advanced analytical outputs including IAQ, bVOC, CO₂-equivalent, gas intensity, gas scan, and air quality indexes. Humidity Sensors Pins: Digital Humidity and Temperature Sensor Probe I2C Interfacing with MCU:

7Semi I2C BME680 Sensor Probe Powered by Bosch Sensortec BME680 Sensor The 7Semi BME680 Environmental Sensor Probe is a compact and rugged sensing module designed for high-accuracy air quality monitoring in demanding indoor and industrial environments. Built around the Bosch BME680 multisensor chip, it delivers precise temperature, humidity, barometric pressure, and VOC gas readings over a reliable I2C interface. With its fully calibrated output and fast response time, this probe is ideal for engineers and system designers building smart HVAC controls, home automation setups, or environmental monitoring equipment. Encased in a breathable, chemically resistant plastic shell, the BME680 probe ensures long-term stability even when exposed to dust, high humidity, or harsh atmospheric conditions. The integrated 1-meter cable with a Mini Round Shell connector makes installation easy across ducts, walls, chambers, and compact enclosures. Its low power consumption and wide operating range make it a dependable choice for air quality monitoring projects, IoT systems, and precision sensor applications. Features: Offers 4-in-1 environmental sensing, providing temperature, humidity, barometric pressure, and VOC gas measurements in a compact and efficient module. Utilizes the Bosch BME680 sensor for high accuracy and fast response across a wide range of environmental conditions. Enclosed in a breathable, durable plastic housing that protects the sensor from dust, chemicals, and environmental wear while ensuring excellent air permeability. Supports I2C digital communication for seamless integration with microcontrollers and embedded systems. Includes a 1-meter cable with a Mini Round Shell Plastic connector, enabling flexible installation in tight or industrial spaces. Operates on low voltage (1.71V to 3.6V), making it ideal for energy-efficient and battery-powered applications. Fully factory-calibrated sensor output eliminates the need for manual tuning or recalibration. Designed for reliable performance in pipes, ducts, walls, HVAC units, greenhouses, and high-humidity environments.

7Semi BME688 Environmental Sensor Breakout with Gas, Temperature, Humidity & Pressure Monitoring The 7Semi BME688 Environmental Sensor Breakout is a next-generation module designed for creators, engineers, and researchers looking to capture highly accurate environmental data in one compact board. Built using Bosch Sensortec’s advanced technology, it measures temperature, humidity, barometric pressure, and a wide range of gases - including VOCs, VSCs, CO, and hydrogen. With AI-enabled gas scanning, this sensor offers unmatched flexibility and precision, making it ideal for air quality monitoring, IoT devices, and smart home automation. This tiny board brings premium reliability, fast response times, and long-term stability to any embedded setup. Thanks to support for both I2C and SPI interfaces, the BME688 integrates easily with platforms like Arduino, ESP32, and Raspberry Pi. Whether you’re building an indoor air quality tracker, creating a wearable environmental sensor, or developing research-grade monitoring equipment, this module delivers the depth of data you need. With intelligent gas detection powered by machine learning and a wide operating range, the BME688 excels in environmental sensing, embedded electronics, and modern IoT applications without adding bulk or complexity. Features: Delivers 4-in-1 sensing capabilities with precise measurement of temperature, humidity, atmospheric pressure, and multiple gases in a single compact module. Features AI-enabled gas scanning that detects VOCs, VSCs, carbon monoxide, hydrogen, and other gases using machine-learning-based profiling. Provides high accuracy, low drift, and rapid response speeds for dependable long-term environmental monitoring. Offers flexible integration with both I2C and SPI interfaces for seamless compatibility across microcontrollers and embedded systems. Compact, lightweight design makes it suitable for portable devices, IoT deployments, smart home systems, and environmental research setups. Allows custom tuning of sampling rates, power consumption, and gas sensitivity for specialised applications. Backed by Bosch Sensortec’s reputation for durability, ensuring stability and reliable performance in continuous operation. BME688 4-in-1 Air Quality Sensor Breakout Dimensions: BME688 4-in-1 Air Quality Sensor Breakout Pinouts:

SmartElex BME688 Environmental Sensor Breakout Board Measures Temperature, Humidity, Pressure & Gas The SmartElex BME688 Environmental Sensor is an advanced all-in-one module designed to measure air quality, temperature, humidity, and barometric pressure with high accuracy. Powered by Bosch’s BME688 chip, this compact environmental sensor can detect a wide range of gases, including volatile organic compounds (VOCs), carbon monoxide, and hydrogen, making it ideal for monitoring air conditions in both indoor and outdoor environments. This smart air quality sensor communicates via I2C or SPI, ensuring easy integration with various microcontrollers like Arduino, Raspberry Pi, and ESP32. With its precise readings and low power consumption, the SmartElex BME688 is perfect for environmental monitoring systems, weather stations, and smart home applications. Its compact design, reliability, and versatility make it a great choice for students, developers, and professionals building air-quality or IoT-based projects. Features: Combines gas, temperature, humidity, and barometric pressure sensing in one module. Detects VOCs, VSCs, carbon monoxide, and hydrogen in ppb range. Supports both I2C and SPI communication interfaces. High accuracy with ±3%RH humidity and ±1.0°C temperature precision. Operating voltage: 1.71V – 3.6V (typically 3.3V). Compact design with 2x Molex PicoBlade connectors for easy integration. Ultra-low power consumption with sleep mode and adjustable scan modes.

MQ-2 NH3 Gas Sensor Module The MQ-2 gas sensor is a device that can detect a variety of gases, including flammable gases such as propane and methane, as well as smoke. It is commonly used in applications such as gas leak detectors, safety devices, and industrial control systems. The MQ-2 sensor operates by using a chemical reaction between the target gas and conductive metal oxide to produce a current. The magnitude of the current is proportional to the concentration of the target gas in the air. The gas sensor can be used to detect a wide range of gas concentrations, depending on the specific type of gas being detected. It is important to note that the MQ-2 sensor is not selective for specific gas and may be triggered by other gases as well. It is recommended to use the MQ-2 sensor with caution and to take appropriate safety measures when working with it. Applications: Detect or measure Gases like H2, LPG, CH4, CO, Smoke or Propane Air quality monitor Gas leak alarm Safety standard maintenance Maintaining environmental standards  in hospitals

MQ-7 Gas Sensor The MQ-7 gas sensor is a device that can detect the presence of carbon monoxide (CO) gas in the air. It is commonly used in applications such as gas leak detectors, safety devices, and industrial control systems. The MQ-7 sensor operates by using a chemical reaction between the CO gas and a conductive metal oxide to produce a current. The magnitude of the current is proportional to the concentration of CO gas in the air. The sensor can be used to detect CO gas concentrations in the range of 20-2000 ppm. It is important to note that CO is a poisonous gas that can be dangerous at high concentrations. It is recommended to use the MQ-7 gas sensor with caution and to take appropriate safety measures when working with it. The MQ-7 can detect CO-gas concentrations anywhere from 20 to 2000ppm. This sensor has a high sensitivity and fast response time. The sensor’s output is an analog resistance.

Fermion: MEMS Nitrogen Dioxide NO2 Gas Detection Sensor Fermion: MEMS Nitrogen Dioxide NO2 Gas Detection Sensor is the perfect solution for air quality monitoring. It is compact, accurate, and low power, featuring advanced MEMS technology, durable materials, and a user-friendly design. Made with high-quality materials, the sensor ensures reliable performance and rapid response, making it suitable for various conditions and perfect for environmental safety. Our product is easy to use and maintain with minimal heat generation and is designed to solve air quality detection needs. Fermion: MEMS Nitrogen Dioxide NO2 Gas Detection Sensor measures 13x13x2.5mm and is suitable for all ages. Available in standard size. Precautions for use Kindly remove the protective film before usage. To prevent exposure to volatile silicon compounds vapors (such as silicone adhesive, hair gel, silicone rubber, or other locations where volatile silicon compounds are present). Avoid exposure to high concentrations of corrosive gases (such as H2S, SOX, Cl2, HCl, etc.). Prevent contamination from alkalis, alkali metal salts, and halogens. Refrain from prolonged exposure to extreme environments (such as high temperatures, high humidity, and high pollution). Avoid contact with water, condensation, and freezing. Minimize excessive vibration, impact, and dropping. Please refrain from employing this module in systems that involve personal safety concerns. For extended non-usage periods, preheating the module for at least 24 hours is advisable. Features: Compact size, measuring only 13*13*2.5mm Low power consumption, operating current ?20mA High sensitivity and rapid response recovery Advanced MEMS technology Applications: Air quality monitoring: measures the level of NO2 and other pollutants in the ambient air. Automotive emission control monitors vehicle NO2 emissions and adjusts the fuel injection and combustion parameters to reduce them. Industrial safety: detects the leakage or exposure of NO2 and other toxic gases in industrial processes or workplaces.

MQ-4 Natural Gas Sensor Module This is a straightforward MQ-4  Gas Sensor Module that detects the presence of Compressed Natural Gas (CNG), methane (CH4), and other gases in the air. Our MQ-4 sensor is used in the module. It simplifies the interface to the sensor's odd pin spacing by providing the interface via standard 4 x 0.1?? header pins. It has an analogue output that corresponds to the concentration of gases in the air and a simple digital output. The onboard potentiometer can be used to set the maximum gas concentration that will trigger the digital output. The MQ-4 sensor is capable of detecting natural gas concentrations ranging from 200 to 10000ppm. Simply connect the MQ 4 sensor module to 5V, set the threshold, and you can begin measuring the gas concentration in the air around the sensor! The presence of any gas is indicated by an onboard LED. Microcontrollers and other circuits can easily interface with the digital output. The analogue output can be connected to a microcontroller's ADC to obtain a wide range of sensor readings. This is a simple compressed natural gas (CNG) sensor for sensing natural gas concentrations in the air (mostly Methane [CH4]). If you want to use this MQ-4 Gas Sensor Module with Arduino, for that you will need Arduino jumper wires buzzer or siren Features: Signal output indicator Dual Signals output (analog output and TTL output) The TTL output signal is low level, allows to connect with SCM directly High sensitivity Long working life and stable performance Quick response and recovery. Read our blog MQ sensor where we explained what is a gas sensor, what is 1ppm equal to, MQ sensor list of different series and their features. MQ-4 Natural Gas Sensor Module pin Diagram MQ-4 Natural Gas Sensor Module pin description 1 AO Analog output ( Sensor data output in analog form) 2 DO Digital output ( Sensor data output in digital form) 3 GND To -ve of power supply 4 VCC To +ve of power supply Applications: Domestic gas leakage detector Industrial Combustible gas detector Portable gas detector Model MQ4 Gas Sensor Module IC Chip LM393 Operating Voltage 3 ~ 5V (DC) Detecting Range 300ppm to 10000ppm Dimensions 3.1 x 1.9 x 2.1 cms Weight 5 grams

MQ-8 Gas Sensor Module The MQ-8 gas sensor module is a device that can detect the presence of hydrogen gas in the air. It is commonly used in applications such as gas leak detectors, safety devices, and industrial control systems. The MQ-8 sensor operates by using a chemical reaction between the hydrogen gas and a conductive metal oxide to produce a current. The magnitude of the current is proportional to the concentration of hydrogen gas in the air. The sensor can be used to detect hydrogen gas concentrations in the range of 100-10000 ppm. Using a simple circuit to convert the change in conductivity of the gas concentration corresponding to the output signal. MQ-8 hydrogen gas sensor of high sensitivity, the monitoring of the other hydrogen-containing gas is also very satisfactory. This sensor can detect a wide range of hydrogen gas, city gas, in particular, is a low-cost sensor for a variety of applications. Suitable for home or industrial hydrogen leakage monitoring devices. Can not interfere with ethanol vapor, soot, carbon monoxide, and other gases. Applications: Detect leakages in the industry Used in mines Can be used in refrigerators and AC

MQ-6 Gas Sensor Module The MQ-6 gas sensor module is a simple and easy-to-use device designed to sense LPG, composed mainly of propane and butane, concentrations in the air. With a sensitivity range from 200 to 10,000ppm, the MQ-6 gas sensor is suitable for a range of applications. The MQ-6 gas sensor has high sensitivity and fast response times. The sensor's output is an analog resistance, and the drive circuit is uncomplicated, requiring only a 5V power source to the heater coil, a load resistance, and a connection to an ADC. The MQ-6 gas sensor employs SnO2 as its sensitive material, which has low conductivity in clean air. As the concentration of target combustible gas increases, the sensor's conductivity rises correspondingly. By using a simple electro circuit, the change in conductivity can be converted into a corresponding gas concentration output signal. This gas sensor is highly sensitive to propane, butane, and LPG, as well as natural gas. The sensor can detect different combustible gases, particularly methane, and is suitable for various applications due to its low cost. Features Operating Voltage is +5V Can be used to detect LPG or Butane gas Analog output voltage: 0V to 5V Digital Output Voltage: 0V or 5V (TTL Logic) Preheat duration 20 seconds Can be used as a Digital or analog sensor The Sensitivity of Digital pin can be varied using the potentiometer Applications: Detect or measure Gases like LPG, and butane Air quality monitor Gas leak alarm Safety standard maintenance Maintaining environmental standards  in hospitals Also check the mq135 gas sensor , which is a versatile device designed for detecting gases like ammonia, sulfur dioxide, and carbon monoxide.

UNO 21-in-1 Starter Kit compatible with Arduino This is a 21-in-1 Arduino starter kit based is validated on Arduino but other microcontrollers can be used as well. This UNO starter kit contains all the necessary electronic components to get started with the UNO board, Arduino, and embedded systems. All the sensors included in the kit are of good quality and are compatible with Arduino. The Arduino Starter kit will help you get started in the world of electronics and embedded system programming. This kit is aimed at beginners and intermediates and can be used to jump-start your growth and learning towards DIY electronics and embedded system. This Arduino starter kit is useful for students and hobbyists to test and prototype their electrical projects. Engineering students can buy UNO basic starter kits online to develop and build their final semester projects. Uno SMD : The Uno is a microcontroller board based on the ATmega328P. It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz ceramic resonator, a USB connection, a power jack, an ICSP header, and a reset button. Breadboard : A breadboard allows for easy and quick creation of temporary electronic circuits or to carry out experiments with circuit design. Battery cap : The Battery caps serve two purposes; they permit the checking and maintenance of water and acid levels and provide a vent for the escape of gases formed when the battery is charging. Resistor Box : The resistance box is an instrument for measuring and comparing electrical resistances. Capacitor : A capacitor is a passive two-terminal electrical component used to store energy electrostatically in an electric field. Jumper Wires : Male ends have a pin protruding and can plug into things, while female ends do not and are used to plug things into. Male-to-male jumper wires are the most common and what you likely will use most often. Transistor : A transistor is a device that regulates current or voltage flow and acts as a switch or gate for electronic signals Button Switch : A button switch is a type of switch which consists of a simple electric mechanism or air switch mechanism to turn something on or off. Buzzer : A buzzer or beeper is an audio signaling device, which may be mechanical, electromechanical, or piezoelectric (piezo for short). LDR : An LDR (Light Dependent Resistor) is a component that has a (variable) resistance that changes with the light intensity that falls upon it. This allows them to be used in light sensing circuits. Light Dependent Resistors (LDR) are also called photoresistors. SEVEN-SEGMENT DISPLAY : A seven-segment display is a set of seven bar-shaped LED (light-emitting diode) or LCD (liquid crystal display) elements, arranged to form a squared-off figure 8. A few seven-segment displays use other illumination devices, such as incandescent or gas-plasma ("neon") lamps. PIR Motion Sensor Module : PIR sensors allow you to sense motion, almost always used to detect whether a human has moved in or out of the sensors range. They are small, inexpensive, low-power, easy to use and don't wear out. PIRs are basically made of a pyroelectric sensor, which can detect levels of infrared radiation. 16X2 LCD MODULE : The 16x2 Alphanumeric LCD Display Module is equally popular among hobbyists and professionals for its affordable price and easy-to-use nature. As the name suggests the 16x2 Alphanumeric LCD can show 16 Columns and 2 Rows therefore a total of (16x2) 32 characters can be displayed. Each character can either be an alphabet or number or even a custom character. Check out our entire range of DIY Kits Compatible with Arduino Pinout for Arduino Uno Arduino Uno Pinouts Applications: Home Automation System Security System IoT based projects DIY Projects

DFRobot Fermion MEMS Methane CH4 Gas Sensor (Breakout, 1-10000ppm) The DFRobot Fermion MEMS Methane CH4 Gas Sensor is a compact and energy-efficient breakout board designed to detect methane concentrations from 1 to 10,000ppm. Powered by advanced MEMS technology, it features ultra-low power consumption (<20mA), minimal heat generation, and a fast response time. Its small size (13x13x2.5mm) makes it perfect for integration into gas leak detectors, safety systems, and environmental monitoring devices. Ideal for fire prevention and combustible gas detection, this sensor is part of a versatile MEMS series supporting multiple gas types for customizable sensing solutions. DFRobot Methane CH4 Gas Sensor Interfacing with Arduino Circuit Diagram Precautions for Use Remove the protective film before using the sensor. Avoid exposure to volatile silicon compounds (e.g., silicone adhesives, hair gels, silicone rubber). Do not expose the sensor to high concentrations of corrosive gases (e.g., H?S, SO?, Cl?, HCl). Prevent contamination from alkalis, alkali metal salts, and halogens. Avoid prolonged exposure to extreme environments (high temperature, humidity, or pollution). Keep the sensor away from water, condensation, and freezing conditions. Minimize mechanical stress—avoid strong vibration, impact, or dropping. Do not use this sensor in systems where failure could affect personal safety. If unused for a long time, preheat the sensor for at least 24 hours before reuse. Features Compact size: only 13 × 13 × 2.5mm, ideal for space-constrained applications Low power consumption: operating current less than 20mA High sensitivity with fast response and quick recovery time Built using advanced MEMS (Micro-Electromechanical Systems) technology Applications Health applications Fire detection Industrial safety Environmental monitoring Indoor air quality

Fermion MEMS Smoke Gas Detection Sensor (Breakout, 10-1000ppm) Let me introduce you to the Fermion MEMS Smoke Gas Detection Sensor (Breakout, 10-1000ppm). It’s a really smart sensor that uses advanced technology called MEMS, making it small—just 13x13x2.5mm. This sensor is great because it doesn’t use much power (less than 20mA) and doesn’t get hot. It’s perfect for devices that run on batteries and won’t drain them quickly. When it comes to detecting smoke, this sensor is super fast. It heats up fast and reacts quickly when it senses smoke in the air. Whether you need it for a smoke alarm at home or in a large building, it will alert you right away. What’s neat is it’s part of a family of sensors. There are 11 different types, including formaldehyde (HCHO), carbon monoxide (CO), methane (CH4), volatile organic compounds (VOC), ammonia (NH3), hydrogen sulfide (H2S), ethanol (EtOH), smoke, odor, hydrogen (H2), and nitrogen dioxide (NO2). You can mix and match them to build a system that’s just right for what you need. So, whether you want to improve safety at home or keep your workplace safe, the Fermion MEMS Smoke Sensor is a smart choice. It’s reliable and efficient, giving you peace of mind wherever you use it. Features: Measures 13x13x2.5mm for easy integration. Operates on less than 20mA. Uses advanced MEMS technology for precise detection. Provides quick detection and recovery times. Precautions for use Before using the sensor, make sure to take off any protective film. Keep the sensor away from places with strong-smelling products like silicone adhesive, hair gel, or silicone rubber. Don't expose the sensor to strong gases like H2S, SOX, Cl2, HCl, etc. Keep the sensor away from chemicals like strong bases, salts, and certain chemicals with halogens. Protect the sensor from extreme conditions like very hot or humid environments, and places with a lot of pollution. Don't let water or ice touch the sensor. Try not to shake, drop, or hit the sensor. Don't use the sensor where it could affect someone's safety. If it hasn't been used for a while, warm up the sensor for 24 hours before using it again. Wiring Diagram of Fermion MEMS Smoke sensor and Arduino UNO

MQ-3 Gas Sensor Module This is the MQ-3 Gas Sensor Module, which is simple to use. It can sense the presence of Alcohol in the air. The module uses our MQ-3 sensor. It simplifies the interface to the odd pin spacing of the sensor and provides an interface through standard 4 x 0.1? header pins.  MQ-3 gas sensor provides an analog output corresponding to the concentration of the gas in the air and an easy-to-use digital output. The sensitive material used for this sensor is SnO2, whose conductivity is lower in clean air. Its conductivity increases as the concentration of alcohol gasses increases. It has a high sensitivity to alcohol and has good resistance to disturbances due to smoke, vapour and gasoline. MQ-3 gas sensor module provides both digital and analog outputs. It can be easily interfaced with Microcontrollers like Arduino Boards , Raspberry Pi etc. This MQ-3 alcohol sensor is suitable for detecting alcohol concentration on your breath, just like your common breathalyzer. It has a high sensitivity and fast response time. The sensor provides an analog resistive output based on alcohol concentration. The drive circuit is very simple, all it needs is one resistor. A simple interface could be a 0-3.3V ADC read more : All About MQ Series Gas Sensor Key Features: Semiconductor Sensor Type Simple SIP header interface Compatible with the majority of microcontrollers Mode of low-power standby Heater voltage is required Excellent sensitivity to alcohol gas High sensitivity and rapid response Longevity at a low cost MQ-3 Gas Sensor Module Pin Diagram: MQ-3 Gas Sensor Module Pin Description MQ-3 Gas Sensor Module Pin Description: Pin Number Pin Name Description 1 VCC This pin provides power to the module; the typical operating voltage is +5V. 2 GND This pin Connects the module to the system ground. 3 DO ( Digital Out) You can also use this sensor to get digital output from this pin by adjusting the potentiometer. 4 AO ( Analog Out) Based on the intensity of the gas, this pin outputs a 0-5V analogue voltage. Applications Car alcohol alarm Breathalyzer Alarm for exceeded gas level Portable alcohol detector Stand-alone/background sensing device Environmental monitoring equipment

MQ-137 NH3 Gas Sensor Module The MQ137 sensor is a gas sensor module specially designed to detect and sense gases like ammonia (NH3) and carbon monoxide (CO). The MQ-137 gas sensor module is a device that can detect the presence of ammonia (NH3) gas in the air. It is commonly used in applications such as air quality monitors, industrial control systems, and agricultural environments. The MQ-137 sensor operates by using a chemical reaction between the ammonia gas and conductive metal oxide to produce a current. The magnitude of the current is proportional to the concentration of ammonia gas in the air. The sensor can be used to detect ammonia gas concentrations in the range of 0-1000 ppm. Ammonia is a toxic gas that can be harmful to humans at high concentrations. It is recommended to use the MQ-137 sensor with caution and to take appropriate safety measures when working with it. Applications: Detect or measure Gases like NH3 or CO Air quality monitor Gas leak alarm Safety standard maintenance Maintaining environmental standards  in hospitals