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The Methane/CNG Sensor MQ4 Breakout with Qwiic offers a reliable, compact solution for detecting combustible gases like Methane (CH4) and Compressed Natural Gas (CNG). Built around the sensitive MQ-4 sensor, the board includes an ATTiny404 MCU that converts the analog signal to a digital I²C output, simplifying integration and eliminating the need for external ADCs or complex calibration. This ready-to-use module is ideal for environmental monitoring and safety applications.
 
Designed for easy integration, the breakout features a 4-pin Qwiic (formerly easyC) connector, allowing solder-free connection to Qwiic-enabled development boards. The I²C interface supports multiple sensors on a single bus and works with a range of microcontrollers, from Arduino to Raspberry Pi. Low power consumption makes it suitable for battery-powered or remote monitoring systems, while the robust design ensures long-term stability in demanding environments.
 
Perfect for portable gas leak detectors, automated ventilation systems, or air quality monitoring stations, the MQ4 breakout provides accurate, digital gas sensing for both educational and professional projects. Simply connect via the Qwiic port to your microcontroller and start monitoring Methane and CNG immediately.

MQ sensors, including the MQ3 sensor, have the capability to detect various gases. The MQ3 sensor is specifically designed to detect alcohol vapors. This means it is sensitive to alcohols such as methanol, ethanol, and isopropanol. The MQ3 sensor is commonly used for measuring alcohol concentration in the air and serves as a useful tool for alerting to the presence of alcohol in the environment.

It is important to note that MQ sensors are not specific to only one gas and can react to other gases besides the ones they are specifically designed for. Therefore, it is important to use the MQ3 sensor exclusively for alcohol detection and follow the manufacturer’s instructions to achieve optimal accuracy and reliability of measurements. It requires a short time to heat up in order to work correctly.

The breakout board provides digital and analog information through the easyC system. Sensor readings are obtained through easyC.

Product usage tips:

When gas is detected, the LED will start glowing. It will remain off if it doesn’t detect anything. Four mounting holes enable easy mounting to surfaces. The board comes with three male headers.

MQ sensors, including the MQ2 sensor, have the capability to detect various gases. The MQ2 sensor is specifically designed to detect combustible gases such as LPG (liquefied petroleum gas), butane, propane, methane, alcohol, hydrogen, and smoke. These gases are commonly found in residential, industrial, and automotive environments. The sensor’s sensitivity and responsiveness enable it to detect even trace amounts of these gases, making it a valuable tool for gas leakage detection, fire detection, and air quality monitoring. It takes a short time to heat up in order to work correctly.

The breakout board provides digital and analog information through the easyC system. Sensor readings are obtained through easyC.

Product usage tips:

When gas is detected, the LED will start glowing. It will remain off if it doesn’t detect anything. Four mounting holes enable easy mounting to surfaces. The board comes with three male headers.

The MQ138 sensor is specifically designed to detect various gases, with a primary focus on air quality monitoring. While its main target gas is formaldehyde (HCHO), it is also sensitive to a range of other gases, including volatile organic compounds (VOCs – toulen, alcohol, acetone and hydrogen) and other harmful gases commonly found in the environment. It takes a short time to heat up in order to work correctly.

The breakout board works with both digital (DO) and analog signals (AO). The digital output is obtained by setting a threshold value with a potentiometer. The analog output will differ depending on the intensity of the gas.

Product usage tips:

When gas is detected, the LED will start glowing. It will remain off if it doesn’t detect anything. Two mounting holes enable easy mounting to surfaces. The board comes with four male headers that need to be soldered.

The MQ137 sensor’s sensitivity and selectivity allow it to effectively detect and measure ammonia levels, making it a valuable tool for applications such as gas leakage detection, agricultural monitoring, and environmental sensing. By integrating the MQ137 sensor with appropriate electronic circuits and microcontrollers like Dasduino, you can create systems that provide real-time monitoring and prompt alerts in the presence of hazardous ammonia concentrations. It takes a short time to heat up in order to work correctly.

The breakout board works with both digital (DO) and analog signals (AO). The digital output is obtained by setting a threshold value with a potentiometer. The analog output will differ depending on the intensity of the gas.

Product usage tips:

When gas is detected, the LED will start glowing. It will remain off if it doesn’t detect anything. Two mounting holes enable easy mounting to surfaces. The board comes with four male headers that need to be soldered.

Monitor your indoor air quality and protect your health with this versatile MQ135 multi-gas sensor. Perfect for detecting dangerous CO2 levels, organic compounds (VOCs), ammonia, benzene, and smoke in homes, offices, and workshops. Whether you’re building a smart home air quality system, creating environmental monitoring stations, or developing safety alert systems, this Arduino compatible sensor provides real-time gas detection with both analog and digital outputs. With our comprehensive documentation and library, you should be set to start working on your projects quickly!

This breakout board provides both digital (DO) and analog (AO) outputs for maximum flexibility. The digital output features an adjustable threshold via an onboard potentiometer, enabling custom trigger points for alarm systems and automated responses. The analog output delivers proportional voltage readings (0-5V) corresponding to gas concentration levels, perfect for data logging and monitoring applications. Operating at 5V with 150mA consumption, the sensor includes pre-heating circuitry for accurate readings and features mounting holes for permanent installations. The compact 22x38mm form fits easily into enclosures while providing environmental sensing capabilities.

Allow an initial pre–heating (48 hours first run and then each consecutive run 5 mins heat up time) period for optimal accuracy and stability. The MQ135 sensor provides relative gas concentration readings for trend monitoring and threshold detection. For precise measurements, calibration with known gas concentrations is recommended. Compatible with 5V microcontroller systems. Includes documentation, example code, and wiring diagrams to get your air quality monitoring project running. Perfect for smart home automation, environmental research, and safety monitoring applications.

The MQ131-H is the high concentration version of the MQ131 ozone sensor, designed for detecting ozone (O₃) levels in the 10–1000 ppm range. This sensor offers good sensitivity to O₃ and operates on the semiconductor detection principle, making it well-suited for industrial and environmental applications.

The MQ131 sensor’s sensitivity and selectivity enable it to effectively detect and measure ozone levels, making it a valuable tool for applications such as air quality monitoring, ozone generators, and ozone leakage detection systems. By integrating the MQ131 sensor with appropriate electronic circuits and microcontrollers like Dasduino, you can create systems that provide real-time ozone concentration monitoring and trigger alerts when hazardous levels are detected.

The breakout board works with both digital (DO) and analog signals (AO). The digital output is obtained by setting a threshold value with a potentiometer, while the analog output will vary depending on the intensity of the detected gas.

Product usage tips:

• When gas is detected, the LED will light up. It will remain off if no gas is detected.
• The board includes two mounting holes for easy installation on surfaces.
• Four male headers are included but need to be soldered by the user.

We are surrounded by invisible gases everywhere. While we generally don’t have to worry about them, under the right circumstances, they can be very combustible and dangerous. The MQ9 breakout board detects carbon monoxide, methane, propane, and other flammable gases so the right measures can be taken in time. The sensor detects carbon monoxide at 10-1000 ppm and other combustible gasses at 100-10000 ppm.

The digital and analog outs can be found on the through-holes. They are marked as DO and AO respectively. The digital output can be obtained by setting a threshold value with a potentiometer. The analog output will depend on the intensity of the gases.

Product usage tips:

The sensor needs 48 hours to preheat to optimal working temperature. If it detects some gas, the LED will glow. If there are no gases, it will remain off. The board can be attached to the project thanks to the two mounting holes. It comes with four pins that need to be soldered.

Due to its long life, the breakout board can be used for quite some time without a second thought. To prevent damage to the sensor, avoid dipping it in water or freezing it. Highly corrosive gases will weaken the sensor significantly.

Hydrogen is all around us, and it’s very flammable. Its leakage can be very dangerous to both life and property. That’s why it’s important to detect any leakage to prevent in the industry. To help with that, hydrogen sensors like the MQ8 breakout board are used. The sensor detects hydrogen at the range of 100-10000 ppm.

The digital and analog outs are on the breakout through-hole pins. They are marked as DO and AO respectively. By setting a threshold value with a potentiometer, you can get the digital output. The analog output will depend on how much gas is detected around the sensor.

Product usage tips:

The sensor needs 48 hours to preheat to optimal working temperature. The LED on the board will remain off if it detects no gas, and will glow once it does. Two mounting holes allow you to easily secure the board in place. The four pins provided need to be soldered.

Due to its long life, you won’t have to worry about changing the sensor often. To prevent damage to the sensor, do not submerge it underwater or freeze it. It will be weakened by highly corrosive gases as well.

The MQ7 sensor’s sensitivity and selectivity allow it to effectively detect and measure carbon monoxide levels, making it a crucial tool for applications such as gas leakage detection, safety systems, and environmental monitoring. By interfacing the MQ7 sensor with appropriate electronic circuits and microcontrollers like Arduino, you can create systems that provide real-time monitoring and prompt alerts in the presence of hazardous CO concentrations. It needs a bit of time to warm up in order to work correctly.

The breakout board works with both digital (DO) and analog signals (AO). The digital output is obtained by setting a threshold value with a potentiometer. The analog output will differ depending on the intensity of the gas.

Product usage tips:

When gas is detected, the LED will start glowing. It will remain off if it doesn’t detect anything. Two mounting holes enable easy mounting to surfaces. The board comes with four male headers that need to be soldered.

Humans can detect many scents, but can have difficulties when it comes to differentiating gases. That’s why we use sensors like MQ6. It detects LPG and butane in the air. When heated to the optimum working temperature, it detects changes in air concentrations very quickly between 200 and 10000 ppm.

The DO pin stands for digital out. AO stands for analog out. The digital output is obtained by setting a threshold value using the potentiometer. The analog output will depend on the intensity of the gas around the sensor.

Product usage tips:

Preheating the sensor to the optimal working temperature takes 24 hours. The LED on the board will glow when gas is detected. It will remain off when it’s not. The board has two mounting holes for easy attachment to the project. It comes with four pins that need to be soldered.

You can use the board for years due to its long life. To prevent damage to the sensor, it should not be dipped in water or frozen. Highly corrosive gases will render the sensor useless. Cooking fumes and cigarette smoke will interfere with the sensor.

Is your office near a high-traffic area? Are you concerned about the amount of natural and liquefied petroleum gases in your work environment? The MQ5 is a simple-to-use sensor to put your mind at ease. It detects gas particles very quickly between 200 and 10000 ppm.

The breakout board works with both digital (DO) and analog signals (AO). The digital output is obtained by setting a threshold value with a potentiometer. The analog output will differ depending on the intensity of the gas.

Product usage tips:

The sensor takes 24 hours to preheat to optimal working temperature. When gas is detected, the LED will start glowing. It will remain off if it doesn’t detect anything. Two mounting holes enable easy mounting to surfaces. The board comes with four pins that need to be soldered.

The breakout board boasts a long life so you don’t have to worry about it suddenly breaking. Submerging the sensor underwater and freezing it will damage it beyond repair. Highly corrosive gases will also damage the sensor.

Have you ever wondered how much natural gas and methane are in your living room? You can easily measure that! The MQ4 breakout board is a simple-to-use sensor that detects the natural gas and methane (CH4) in the air. Once heated to working temperature, it detects changes in air concentrations very quickly between 200 and 10000 ppm.

On the through-holes, the DO stands for digital out and AO for analog out. The digital output is obtained by setting a threshold value using the potentiometer. The analog output will depend on the intensity of the gas around the sensor.

Product usage tips:

The sensor will take 24 hours to preheat to working temperature. The LED on the board will glow when gas is detected, and remain off when it’s not. The board can easily be secured in place using the two mounting holes. It comes with four pins that need to be soldered.

Due to its long life, you can use this board for years without much of a thought. Dipping the sensor in water and freezing it will damage it, so avoid doing that. Highly corrosive gases will weaken it significantly, making it useless.

MQ sensors, including the MQ2 sensor, have the capability to detect various gases. The MQ2 sensor is specifically designed to detect combustible gases such as LPG (liquefied petroleum gas), butane, propane, methane, alcohol, hydrogen, and smoke. These gases are commonly found in residential, industrial, and automotive environments. The sensor’s sensitivity and responsiveness enable it to detect even trace amounts of these gases, making it a valuable tool for gas leakage detection, fire detection, and air quality monitoring applications. It takes a short time to heat up in order to work correctly.

The breakout board works with both digital (DO) and analog signals (AO). The digital output is obtained by setting a threshold value with a potentiometer. The analog output will differ depending on the intensity of the gas.

Product usage tips:

When gas is detected, the LED will start glowing. It will remain off if it doesn’t detect anything. Two mounting holes enable easy mounting to surfaces. The board comes with four pins that need to be soldered.

The Smart LED WS2812B Ring24 is a circular array of 24 individually addressable WS2812B RGB LEDs, perfect for vibrant and dynamic lighting. Each LED can be controlled independently via a single data line, enabling complex animations and color patterns with microcontrollers like Arduino or ESP32. Its durable design ensures reliable performance for wearable tech, ambient lighting, or LED Alerts.
 
Operating at 5V, each LED draws ~18 mA, with a maximum ring current of 432 mA. The 67 mm diameter fits standard enclosures, and the WS2812B protocol allows daisy-chained control from one digital pin. High refresh rates ensure smooth, flicker-free animations with minimal external components.
 
Ideal for visual feedback in robotics, cosplay, or interactive art, the Ring24 displays complex color gradients or status indicators with ease. Pair it with a Qwiic-compatible microcontroller for simplified integration and start building professional-grade dynamic lighting projects today.

The Logic Level Converter TXB0104 breakout safely interfaces components operating at different voltages. The TI TXB0104 IC provides four bidirectional channels, bridging low-voltage microcontrollers (1.8V–3.3V) with higher-voltage peripherals up to 5V. Its auto-direction sensing simplifies data transfer without extra direction pins, ensuring reliable communication across mixed-voltage systems.
 
The TXB0104 handles push-pull and open-drain signals, supporting SPI, I2C, UART, and other digital interfaces. All channels are fully bidirectional, allowing simultaneous two-way communication. The compact breakout format makes it easy to integrate into breadboards or custom PCBs.
 
Ideal for connecting sensors or modules of varying voltages, this breakout ensures safe, stable, and flexible logic-level translation for any project.

ADC (Analog Digital Converter) is a device that reads analog signals (just like the analogRead () function in Arduino IDE) and converts them into digital signals that can be read by a microcontroller. This breakout is based on the ADS1015 ADC, which reads values in 12-bit resolution, receives a maximum of 3.3V on its inputs and has a total of 4 channels (which can also be used as two differential). Works great with any microcontroller at 5V. It has 2 easyC connectors for easier connection on I2C communication.

A digital potentiometer is a device identical to a potentiometer, except that instead of a physical rotating part that adjusts the resistance, it uses digital communication. Namely, the resistance of the digital potentiometer is adjusted via I2C communication.

Our module is based on the MCP4018 IC which has a total of 128 steps between 0 and 100k resistance values. This would mean that it is capable of doing resistance steps of approximately 781 ohms. It is controlled via I2C which makes it extremely easy to use.

A digital potentiometer is a device identical to a potentiometer, except that instead of a physical rotating part that adjusts the resistance, it uses digital communication. Namely, the resistance of the digital potentiometer is adjusted via I2C communication.

Our module is based on the MCP4018 IC which has a total of 128 steps between 0 and 50k resistance values. This would mean that it is capable of doing resistance steps of approximately 390ohms. It is controlled via I2C which makes it extremely easy to use.

A digital potentiometer is a device identical to a potentiometer, except that instead of a physical rotating part that adjusts the resistance, it uses digital communication. Namely, the resistance of the digital potentiometer is adjusted via I2C communication.

Our module is based on the MCP4018 IC which has a total of 128 steps between 0 and 10k resistance values. This would mean that it is capable of doing resistance steps of approximately 78ohms. It is controlled via I2C which makes it extremely easy to use.

Joystick module is well known to all – it is identical to the one found in the PlayStation2 joystick. Whether you are making a game with a microcontroller or want more freedom while navigating a joystick module will come handy.

It reads X and Y position of the joystick knob (used for controlling) and whether the joystick is being pressed down. X and Y values are shown in the form of analog values while reading off if the joystick is pressed or not is shown in the form of digital value (HIGH/LOW; it has pull-up resistor).

If you are working with audio and need easy access to all the pins of the 3.5mm connector, this breakout makes it possible. It accepts a male 3.5mm connector, in a 4-pin version, and allows access to all connector pins on the header.

Dimensions: 22 mm x 22 mm
Board connector: 3.5mm female, accepts 3.5mm male
Connections: ground, speaker right, speaker left, microphone
Mounting holes: 2

If you need a simple and stable power source on your breadboard, this board is here to help. Just give it some other power source via DC port or USB-C, and it gives you 3V3, 5V or 12V discretely to the power lines on the experimental. The output voltages are adjustable for both sides via switches. It also has a power LED, ignition switch and automatic power source selection (if both are present, it will be powered via the DC jack).

*12V is only available when used with a DC jack with 12V power supply