
HGLRC M100 PRO GPS
The HGLRC M100 PRO GPS is a compact and high-precision GPS module designed for drone applications. It utilizes a u-blox M10 chip, offering fast and accurate positioning with support for multiple satellite constellations, including GPS, GLONASS, Galileo, and BeiDou. This multi-constellation capability enhances signal reliability and accuracy, even in challenging environments. The module is known for its low power consumption and small form factor, making it ideal for space-constrained builds. Additionally, it often features a built-in compass for heading information and a high update rate, contributing to stable and reliable flight performance.
Features:
- Adopting the new 10th generation chip, the number of satellite searches is 50+
- QMC5883L compass, more accurate pointing
- The receiving channel is expanded to 120ch, and the satellites can search more and faster into the chip.
- Five-mode positioning, strong and stable signal to protect you.
Package Includes:
1 x HGLRC M100 PRO GPS
1 x Heat shrink tube (φ18mm x 25mm)
1 x HGLRC sticker
1 x HGLRC manual
1 x SH1.0-6pin cable

CUAV NEO 3 Pro GPS Module | GNSS U-BLOX M9N CAN BUS
The NEO 3 Pro GPS Module, equipped with GNSS U-BLOX M9N and CAN BUS compatibility, is a state-of-the-art addition to the CUAV product range. Improving upon the NEO V2’s hardware design, the NEO 3 Pro features significant enhancements, notably its integration of the Ublox NEO M9N GNSS module.
This sophisticated module supports a multitude of satellite navigation systems, such as Beidou, Galileo, Glonass, and GPS, all at once. Consequently, users gain from improved precision, with horizontal positioning accuracy up to a remarkable 0.7 meters.
Beyond its advanced GNSS capabilities, the NEO 3 Pro includes built-in safety features like a safety switch, buzzer, and RGB light. These components boost the user experience and guarantee dependable performance across various uses, establishing the NEO 3 Pro GPS Module as an exceptional option for precise navigation and positioning solutions.

SIYI MFD Mini Crossbow AAT Auto Antenna Tracker 489767
The SIYI MFD Mini Crossbow AAT is a sophisticated and compact auto antenna tracker designed to enhance the performance and reliability of your communication systems. Ideal for both amateur and professional applications, this advanced tracker offers precise tracking capabilities to ensure uninterrupted signal reception and transmission.

M8N GPS MODULE SENSOR
The NEO M8N provides the best performance and easiest RF integration of all the NEO M8 configurations. The NEO form factor allows easy migration from previous NEO generations. Sophisticated RF architecture and interference suppression ensure maximum performance even in GNSS hostile environments. NEO M8 combines a high level of robustness and integration capability with flexible connectivity options. The future proof NEO M8N includes an internal Flash that allows simple firmware upgrades for supporting additional GNSS systems.

RAIN DROP SENSOR
The Raindrops Detection sensor module is used for rain detection. It is also for measuring rainfall intensity. Rain sensor can be used for all kinds of weather monitoring and translated into output signals and AO.

MQ 135 Air Quality/Gas Detector Sensor Module For Arduino
The MQ 135 Air Quality Detector Sensor Module For Arduino has lower conductivity in clean air. When the target combustible gas exists, the conductivity of the sensor is higher along with the gas concentration rising.

MQ 8 Hydrogen H2 Gas Sensor Module
A sensitive material MQ 8 Hydrogen Gas Sensor Module H2 Alarm Detection use in clean air low conductivity tin oxide (SnO2). When there is the environment in which the combustible gas sensor, conductivity sensor with increasing concentration of combustible gases in air increases.
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.

MQ 7 CO Carbon Monoxide Coal Gas Sensor Module
The MQ 7 gas sensor is a gas sensor module that incorporates MQ 7, designed for air quality monitoring. It can be used to measure Carbon Monoxide from Different Types of Gasses, then generate digital signals for triggering air treatment devices.

MQ 6 Gas Sensor Module For Propane, Butane, And LPG Detector Module
MQ 6 Liquefied Petroleum Isobutane Propane Gas Sensor module is a great way to add basic gas sensing to your project at a reasonable price. TheMQ 5 Methane LPG Liquid Propane Gas Sensor Module particulate sensor uses a Buzzer to sense any detected material that is even present in the air!
This is a simple to use MQ 6 Liquefied Petroleum Isobutane Propane Gas Sensor module, suitable for sensing LPG (composed of mostly propane and butane) concentrations in the air. The MQ 6 can detect gas concentrations anywhere from 200 to 10000ppm. The MQ 6 Liquefied Petroleum Isobutane Propane Gas Sensor module particulate sensor uses a Potentiometer to change the detection range of the sensor!

MQ 5 Liquefied Gas & Coal Gas Sensor Module
The Simple MQ 5 Methane LPG Liquid Propane Gas Sensor Module is a great way to add basic gas sensing to your project at a reasonable price. TheMQ 5 Methane LPG Liquid Propane Gas Sensor Module particulate sensor uses a Buzzer to sense any detected material that is even present in the air!
This MQ 5 Methane LPG Liquid Propane Gas Sensor Module is widely used in gas leakage detecting pieces of equipment in family and industry, are suitable for detecting LPG, natural gas, town gas, avoid the noise of alcohol and cooking fumes and cigarette smoke

MQ 4 Methane Gas Sensor Module
Sensitive material of MQ 4 gas sensor is SnO2, which with lower conductivity in clean air. When the target combustible gas exist the sensors conductivity increases higher along with the gas concentration rising.
MQ 4 gas sensor has high sensitivity to Natural gas, Methane and could be used to detect both Methane and Propane. The sensor could be used to detect different combustible gas especially Methane, it's low cost and suitable for different application.

MQ 3 Alcohol Detector Gas Sensor Module
MQ 3 module is has a high sensitivity for detecting Alcohol and low sensitivity for Benzine, CH4, Hexane, LPG, CO. The module gives out the concentration of the gases as an analog voltage equivalent to the concentration of the gases. The module also has an onboard comparator for comparing against an adjustable preset value and giving out a digital high or low.
This 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. 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.

MQ 2 Smoke LPG Butane Gas Sensor Module
If you are searching for a Gas sensor module with a very High detection range compared to any ordinary gas sensor then this MQ 2 Smoke LPG Butane Hydrogen Gas Sensor Detector Module will fulfill your specification demands. The MQ 2 Gas sensor detector module has a detection range of 300 10000 ppm. The gas sensor modules are always well known for their robust and simple construction and measures toxic gases in very low concentrations.
The MQ 2 Smoke LPG Butane Hydrogen Gas Sensor Detector Module is useful for gas leakage detection (home and industry). It is suitable for detecting H2, LPG, CH4, CO, Alcohol, Smoke, or Propane. Due to its high sensitivity and fast response time, measurements can be taken as soon as possible. The sensitivity of the sensor can be adjusted by the potentiometer.

SOIL MOISTURE SENSOR (Soil Moisture Meter, Soil Humidity Sensor, Water Sensor, Soil Hygrometer for Ardunio)
This is Soil Moisture Meter, Soil Humidity Sensor, Water Sensor, Soil Hygrometer for Ardunio. With this module, you can tell when your plants need watering by how moist the soil is in your pot, garden, or yard. The two probes on the sensor act as variable resistors. Use it in a home automated watering system, hook it up to IoT, or just use it to find out when your plant needs a little love. Installing this sensor and its PCB will have you on your way to growing a green thumb!

IR Sensor
IR sensor is an electronic device, that emits the light in order to sense some object of the surroundings. An IR sensor can measure the heat of an object as well as detects the motion. Usually, in the infrared spectrum, all the objects radiate some form of thermal radiation. These types of radiations are invisible to our eyes, but infrared sensor can detect these radiations.

IR SENSORS, OBSTACLE AVOIDER SENSOR
Infrared Obstacle Avoidance IR Sensor Module (Active Low) has a pair of infrared transmitting and receiving tubes. When the transmitted light waves are reflected back, the reflected IR waves will be received by the receiver tube. The onboard comparator circuitry does the processing and the green indicator LED comes to life.

IR SENSORS ARRAY FOR LINE FOLLOWING
The basic concept of 4 Channel Infrared IR Line Follower Sensor Obstacle Avoidance Module is to transmit the IR signal (radiation) in a direction and a signal is received at the IR receiver when the IR radiation bounces back from a surface of the object.
This 4 channels IR reflective sensor includes 4 IR sensors and main board to handle all the signals. Each IR reflective sensor is composed of an IR emitter and a receiver, if something is in the measuring range, the sensor would outputs related signal. There are also 4 potentiometers on the main board so that the measuring range can be adjusted as you wish.

SOUND DETECTION SENSOR Module
The sound detection sensor module for Arduino detects whether the sound has exceeded a threshold value. Sound is detected via microphone and fed into an LM393 op amp. The sound level set point is adjusted via an onboard potentiometer. When the sound level exceeds the set point, an LED on the module is illuminated and the output is sent low.

WATER FLOW SENSOR
This sensor sits in line with your water line and contains a pinwheel sensor to measure how much liquid has moved through it. There's an integrated magnetic hall effect sensor that outputs an electrical pulse with every revolution. The hall effect sensor is sealed from the water pipe and allows the sensor to stay safe and dry.

COLOR RECOGNITION SENSOR
The TCS3200 Color Recognition Sensor Module uses a high quality light sensor allowing you to sense any color through a combination of Red, Green, and Blue. The module provides all of the pins of the TCS3200 on convenient 0.1″ headers – ideal for use with PCBs, breadboard or stripboard.

HGLRC M100 PRO GPS
The HGLRC M100 PRO GPS is a compact and high-precision GPS module designed for drone applications. It utilizes a u-blox M10 chip, offering fast and accurate positioning with support for multiple satellite constellations, including GPS, GLONASS, Galileo, and BeiDou. This multi-constellation capability enhances signal reliability and accuracy, even in challenging environments. The module is known for its low power consumption and small form factor, making it ideal for space-constrained builds. Additionally, it often features a built-in compass for heading information and a high update rate, contributing to stable and reliable flight performance.
Features:
- Adopting the new 10th generation chip, the number of satellite searches is 50+
- QMC5883L compass, more accurate pointing
- The receiving channel is expanded to 120ch, and the satellites can search more and faster into the chip.
- Five-mode positioning, strong and stable signal to protect you.
Package Includes:
1 x HGLRC M100 PRO GPS
1 x Heat shrink tube (φ18mm x 25mm)
1 x HGLRC sticker
1 x HGLRC manual
1 x SH1.0-6pin cable

CUAV NEO 3 Pro GPS Module | GNSS U-BLOX M9N CAN BUS
The NEO 3 Pro GPS Module, equipped with GNSS U-BLOX M9N and CAN BUS compatibility, is a state-of-the-art addition to the CUAV product range. Improving upon the NEO V2’s hardware design, the NEO 3 Pro features significant enhancements, notably its integration of the Ublox NEO M9N GNSS module.
This sophisticated module supports a multitude of satellite navigation systems, such as Beidou, Galileo, Glonass, and GPS, all at once. Consequently, users gain from improved precision, with horizontal positioning accuracy up to a remarkable 0.7 meters.
Beyond its advanced GNSS capabilities, the NEO 3 Pro includes built-in safety features like a safety switch, buzzer, and RGB light. These components boost the user experience and guarantee dependable performance across various uses, establishing the NEO 3 Pro GPS Module as an exceptional option for precise navigation and positioning solutions.

SIYI MFD Mini Crossbow AAT Auto Antenna Tracker 489767
The SIYI MFD Mini Crossbow AAT is a sophisticated and compact auto antenna tracker designed to enhance the performance and reliability of your communication systems. Ideal for both amateur and professional applications, this advanced tracker offers precise tracking capabilities to ensure uninterrupted signal reception and transmission.

M8N GPS MODULE SENSOR
The NEO M8N provides the best performance and easiest RF integration of all the NEO M8 configurations. The NEO form factor allows easy migration from previous NEO generations. Sophisticated RF architecture and interference suppression ensure maximum performance even in GNSS hostile environments. NEO M8 combines a high level of robustness and integration capability with flexible connectivity options. The future proof NEO M8N includes an internal Flash that allows simple firmware upgrades for supporting additional GNSS systems.

RAIN DROP SENSOR
The Raindrops Detection sensor module is used for rain detection. It is also for measuring rainfall intensity. Rain sensor can be used for all kinds of weather monitoring and translated into output signals and AO.

MQ 135 Air Quality/Gas Detector Sensor Module For Arduino
The MQ 135 Air Quality Detector Sensor Module For Arduino has lower conductivity in clean air. When the target combustible gas exists, the conductivity of the sensor is higher along with the gas concentration rising.

MQ 8 Hydrogen H2 Gas Sensor Module
A sensitive material MQ 8 Hydrogen Gas Sensor Module H2 Alarm Detection use in clean air low conductivity tin oxide (SnO2). When there is the environment in which the combustible gas sensor, conductivity sensor with increasing concentration of combustible gases in air increases.
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.

MQ 7 CO Carbon Monoxide Coal Gas Sensor Module
The MQ 7 gas sensor is a gas sensor module that incorporates MQ 7, designed for air quality monitoring. It can be used to measure Carbon Monoxide from Different Types of Gasses, then generate digital signals for triggering air treatment devices.

MQ 6 Gas Sensor Module For Propane, Butane, And LPG Detector Module
MQ 6 Liquefied Petroleum Isobutane Propane Gas Sensor module is a great way to add basic gas sensing to your project at a reasonable price. TheMQ 5 Methane LPG Liquid Propane Gas Sensor Module particulate sensor uses a Buzzer to sense any detected material that is even present in the air!
This is a simple to use MQ 6 Liquefied Petroleum Isobutane Propane Gas Sensor module, suitable for sensing LPG (composed of mostly propane and butane) concentrations in the air. The MQ 6 can detect gas concentrations anywhere from 200 to 10000ppm. The MQ 6 Liquefied Petroleum Isobutane Propane Gas Sensor module particulate sensor uses a Potentiometer to change the detection range of the sensor!

MQ 5 Liquefied Gas & Coal Gas Sensor Module
The Simple MQ 5 Methane LPG Liquid Propane Gas Sensor Module is a great way to add basic gas sensing to your project at a reasonable price. TheMQ 5 Methane LPG Liquid Propane Gas Sensor Module particulate sensor uses a Buzzer to sense any detected material that is even present in the air!
This MQ 5 Methane LPG Liquid Propane Gas Sensor Module is widely used in gas leakage detecting pieces of equipment in family and industry, are suitable for detecting LPG, natural gas, town gas, avoid the noise of alcohol and cooking fumes and cigarette smoke

MQ 4 Methane Gas Sensor Module
Sensitive material of MQ 4 gas sensor is SnO2, which with lower conductivity in clean air. When the target combustible gas exist the sensors conductivity increases higher along with the gas concentration rising.
MQ 4 gas sensor has high sensitivity to Natural gas, Methane and could be used to detect both Methane and Propane. The sensor could be used to detect different combustible gas especially Methane, it's low cost and suitable for different application.

MQ 3 Alcohol Detector Gas Sensor Module
MQ 3 module is has a high sensitivity for detecting Alcohol and low sensitivity for Benzine, CH4, Hexane, LPG, CO. The module gives out the concentration of the gases as an analog voltage equivalent to the concentration of the gases. The module also has an onboard comparator for comparing against an adjustable preset value and giving out a digital high or low.
This 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. 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.

MQ 2 Smoke LPG Butane Gas Sensor Module
If you are searching for a Gas sensor module with a very High detection range compared to any ordinary gas sensor then this MQ 2 Smoke LPG Butane Hydrogen Gas Sensor Detector Module will fulfill your specification demands. The MQ 2 Gas sensor detector module has a detection range of 300 10000 ppm. The gas sensor modules are always well known for their robust and simple construction and measures toxic gases in very low concentrations.
The MQ 2 Smoke LPG Butane Hydrogen Gas Sensor Detector Module is useful for gas leakage detection (home and industry). It is suitable for detecting H2, LPG, CH4, CO, Alcohol, Smoke, or Propane. Due to its high sensitivity and fast response time, measurements can be taken as soon as possible. The sensitivity of the sensor can be adjusted by the potentiometer.

SOIL MOISTURE SENSOR (Soil Moisture Meter, Soil Humidity Sensor, Water Sensor, Soil Hygrometer for Ardunio)
This is Soil Moisture Meter, Soil Humidity Sensor, Water Sensor, Soil Hygrometer for Ardunio. With this module, you can tell when your plants need watering by how moist the soil is in your pot, garden, or yard. The two probes on the sensor act as variable resistors. Use it in a home automated watering system, hook it up to IoT, or just use it to find out when your plant needs a little love. Installing this sensor and its PCB will have you on your way to growing a green thumb!

IR Sensor
IR sensor is an electronic device, that emits the light in order to sense some object of the surroundings. An IR sensor can measure the heat of an object as well as detects the motion. Usually, in the infrared spectrum, all the objects radiate some form of thermal radiation. These types of radiations are invisible to our eyes, but infrared sensor can detect these radiations.

IR SENSORS, OBSTACLE AVOIDER SENSOR
Infrared Obstacle Avoidance IR Sensor Module (Active Low) has a pair of infrared transmitting and receiving tubes. When the transmitted light waves are reflected back, the reflected IR waves will be received by the receiver tube. The onboard comparator circuitry does the processing and the green indicator LED comes to life.

IR SENSORS ARRAY FOR LINE FOLLOWING
The basic concept of 4 Channel Infrared IR Line Follower Sensor Obstacle Avoidance Module is to transmit the IR signal (radiation) in a direction and a signal is received at the IR receiver when the IR radiation bounces back from a surface of the object.
This 4 channels IR reflective sensor includes 4 IR sensors and main board to handle all the signals. Each IR reflective sensor is composed of an IR emitter and a receiver, if something is in the measuring range, the sensor would outputs related signal. There are also 4 potentiometers on the main board so that the measuring range can be adjusted as you wish.

SOUND DETECTION SENSOR Module
The sound detection sensor module for Arduino detects whether the sound has exceeded a threshold value. Sound is detected via microphone and fed into an LM393 op amp. The sound level set point is adjusted via an onboard potentiometer. When the sound level exceeds the set point, an LED on the module is illuminated and the output is sent low.

WATER FLOW SENSOR
This sensor sits in line with your water line and contains a pinwheel sensor to measure how much liquid has moved through it. There's an integrated magnetic hall effect sensor that outputs an electrical pulse with every revolution. The hall effect sensor is sealed from the water pipe and allows the sensor to stay safe and dry.

COLOR RECOGNITION SENSOR
The TCS3200 Color Recognition Sensor Module uses a high quality light sensor allowing you to sense any color through a combination of Red, Green, and Blue. The module provides all of the pins of the TCS3200 on convenient 0.1″ headers – ideal for use with PCBs, breadboard or stripboard.

HGLRC M100 PRO GPS
The HGLRC M100 PRO GPS is a compact and high-precision GPS module designed for drone applications. It utilizes a u-blox M10 chip, offering fast and accurate positioning with support for multiple satellite constellations, including GPS, GLONASS, Galileo, and BeiDou. This multi-constellation capability enhances signal reliability and accuracy, even in challenging environments. The module is known for its low power consumption and small form factor, making it ideal for space-constrained builds. Additionally, it often features a built-in compass for heading information and a high update rate, contributing to stable and reliable flight performance.
Features:
- Adopting the new 10th generation chip, the number of satellite searches is 50+
- QMC5883L compass, more accurate pointing
- The receiving channel is expanded to 120ch, and the satellites can search more and faster into the chip.
- Five-mode positioning, strong and stable signal to protect you.
Package Includes:
1 x HGLRC M100 PRO GPS
1 x Heat shrink tube (φ18mm x 25mm)
1 x HGLRC sticker
1 x HGLRC manual
1 x SH1.0-6pin cable

CUAV NEO 3 Pro GPS Module | GNSS U-BLOX M9N CAN BUS
The NEO 3 Pro GPS Module, equipped with GNSS U-BLOX M9N and CAN BUS compatibility, is a state-of-the-art addition to the CUAV product range. Improving upon the NEO V2’s hardware design, the NEO 3 Pro features significant enhancements, notably its integration of the Ublox NEO M9N GNSS module.
This sophisticated module supports a multitude of satellite navigation systems, such as Beidou, Galileo, Glonass, and GPS, all at once. Consequently, users gain from improved precision, with horizontal positioning accuracy up to a remarkable 0.7 meters.
Beyond its advanced GNSS capabilities, the NEO 3 Pro includes built-in safety features like a safety switch, buzzer, and RGB light. These components boost the user experience and guarantee dependable performance across various uses, establishing the NEO 3 Pro GPS Module as an exceptional option for precise navigation and positioning solutions.

SIYI MFD Mini Crossbow AAT Auto Antenna Tracker 489767
The SIYI MFD Mini Crossbow AAT is a sophisticated and compact auto antenna tracker designed to enhance the performance and reliability of your communication systems. Ideal for both amateur and professional applications, this advanced tracker offers precise tracking capabilities to ensure uninterrupted signal reception and transmission.

M8N GPS MODULE SENSOR
The NEO M8N provides the best performance and easiest RF integration of all the NEO M8 configurations. The NEO form factor allows easy migration from previous NEO generations. Sophisticated RF architecture and interference suppression ensure maximum performance even in GNSS hostile environments. NEO M8 combines a high level of robustness and integration capability with flexible connectivity options. The future proof NEO M8N includes an internal Flash that allows simple firmware upgrades for supporting additional GNSS systems.

RAIN DROP SENSOR
The Raindrops Detection sensor module is used for rain detection. It is also for measuring rainfall intensity. Rain sensor can be used for all kinds of weather monitoring and translated into output signals and AO.

MQ 135 Air Quality/Gas Detector Sensor Module For Arduino
The MQ 135 Air Quality Detector Sensor Module For Arduino has lower conductivity in clean air. When the target combustible gas exists, the conductivity of the sensor is higher along with the gas concentration rising.

MQ 8 Hydrogen H2 Gas Sensor Module
A sensitive material MQ 8 Hydrogen Gas Sensor Module H2 Alarm Detection use in clean air low conductivity tin oxide (SnO2). When there is the environment in which the combustible gas sensor, conductivity sensor with increasing concentration of combustible gases in air increases.
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.

MQ 7 CO Carbon Monoxide Coal Gas Sensor Module
The MQ 7 gas sensor is a gas sensor module that incorporates MQ 7, designed for air quality monitoring. It can be used to measure Carbon Monoxide from Different Types of Gasses, then generate digital signals for triggering air treatment devices.

MQ 6 Gas Sensor Module For Propane, Butane, And LPG Detector Module
MQ 6 Liquefied Petroleum Isobutane Propane Gas Sensor module is a great way to add basic gas sensing to your project at a reasonable price. TheMQ 5 Methane LPG Liquid Propane Gas Sensor Module particulate sensor uses a Buzzer to sense any detected material that is even present in the air!
This is a simple to use MQ 6 Liquefied Petroleum Isobutane Propane Gas Sensor module, suitable for sensing LPG (composed of mostly propane and butane) concentrations in the air. The MQ 6 can detect gas concentrations anywhere from 200 to 10000ppm. The MQ 6 Liquefied Petroleum Isobutane Propane Gas Sensor module particulate sensor uses a Potentiometer to change the detection range of the sensor!

MQ 5 Liquefied Gas & Coal Gas Sensor Module
The Simple MQ 5 Methane LPG Liquid Propane Gas Sensor Module is a great way to add basic gas sensing to your project at a reasonable price. TheMQ 5 Methane LPG Liquid Propane Gas Sensor Module particulate sensor uses a Buzzer to sense any detected material that is even present in the air!
This MQ 5 Methane LPG Liquid Propane Gas Sensor Module is widely used in gas leakage detecting pieces of equipment in family and industry, are suitable for detecting LPG, natural gas, town gas, avoid the noise of alcohol and cooking fumes and cigarette smoke

MQ 4 Methane Gas Sensor Module
Sensitive material of MQ 4 gas sensor is SnO2, which with lower conductivity in clean air. When the target combustible gas exist the sensors conductivity increases higher along with the gas concentration rising.
MQ 4 gas sensor has high sensitivity to Natural gas, Methane and could be used to detect both Methane and Propane. The sensor could be used to detect different combustible gas especially Methane, it's low cost and suitable for different application.

MQ 3 Alcohol Detector Gas Sensor Module
MQ 3 module is has a high sensitivity for detecting Alcohol and low sensitivity for Benzine, CH4, Hexane, LPG, CO. The module gives out the concentration of the gases as an analog voltage equivalent to the concentration of the gases. The module also has an onboard comparator for comparing against an adjustable preset value and giving out a digital high or low.
This 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. 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.

MQ 2 Smoke LPG Butane Gas Sensor Module
If you are searching for a Gas sensor module with a very High detection range compared to any ordinary gas sensor then this MQ 2 Smoke LPG Butane Hydrogen Gas Sensor Detector Module will fulfill your specification demands. The MQ 2 Gas sensor detector module has a detection range of 300 10000 ppm. The gas sensor modules are always well known for their robust and simple construction and measures toxic gases in very low concentrations.
The MQ 2 Smoke LPG Butane Hydrogen Gas Sensor Detector Module is useful for gas leakage detection (home and industry). It is suitable for detecting H2, LPG, CH4, CO, Alcohol, Smoke, or Propane. Due to its high sensitivity and fast response time, measurements can be taken as soon as possible. The sensitivity of the sensor can be adjusted by the potentiometer.

SOIL MOISTURE SENSOR (Soil Moisture Meter, Soil Humidity Sensor, Water Sensor, Soil Hygrometer for Ardunio)
This is Soil Moisture Meter, Soil Humidity Sensor, Water Sensor, Soil Hygrometer for Ardunio. With this module, you can tell when your plants need watering by how moist the soil is in your pot, garden, or yard. The two probes on the sensor act as variable resistors. Use it in a home automated watering system, hook it up to IoT, or just use it to find out when your plant needs a little love. Installing this sensor and its PCB will have you on your way to growing a green thumb!

IR Sensor
IR sensor is an electronic device, that emits the light in order to sense some object of the surroundings. An IR sensor can measure the heat of an object as well as detects the motion. Usually, in the infrared spectrum, all the objects radiate some form of thermal radiation. These types of radiations are invisible to our eyes, but infrared sensor can detect these radiations.

IR SENSORS, OBSTACLE AVOIDER SENSOR
Infrared Obstacle Avoidance IR Sensor Module (Active Low) has a pair of infrared transmitting and receiving tubes. When the transmitted light waves are reflected back, the reflected IR waves will be received by the receiver tube. The onboard comparator circuitry does the processing and the green indicator LED comes to life.

IR SENSORS ARRAY FOR LINE FOLLOWING
The basic concept of 4 Channel Infrared IR Line Follower Sensor Obstacle Avoidance Module is to transmit the IR signal (radiation) in a direction and a signal is received at the IR receiver when the IR radiation bounces back from a surface of the object.
This 4 channels IR reflective sensor includes 4 IR sensors and main board to handle all the signals. Each IR reflective sensor is composed of an IR emitter and a receiver, if something is in the measuring range, the sensor would outputs related signal. There are also 4 potentiometers on the main board so that the measuring range can be adjusted as you wish.

SOUND DETECTION SENSOR Module
The sound detection sensor module for Arduino detects whether the sound has exceeded a threshold value. Sound is detected via microphone and fed into an LM393 op amp. The sound level set point is adjusted via an onboard potentiometer. When the sound level exceeds the set point, an LED on the module is illuminated and the output is sent low.

WATER FLOW SENSOR
This sensor sits in line with your water line and contains a pinwheel sensor to measure how much liquid has moved through it. There's an integrated magnetic hall effect sensor that outputs an electrical pulse with every revolution. The hall effect sensor is sealed from the water pipe and allows the sensor to stay safe and dry.

COLOR RECOGNITION SENSOR
The TCS3200 Color Recognition Sensor Module uses a high quality light sensor allowing you to sense any color through a combination of Red, Green, and Blue. The module provides all of the pins of the TCS3200 on convenient 0.1″ headers – ideal for use with PCBs, breadboard or stripboard.