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Here are solid options depending on which gas you need to detect and whether you want simple analog sensing or calibrated digital measurement.
Budget MQ-series (analog, good for hobby leak detection)
- Gravity: Arduino Gas Sensor (MQ2) ($11.80) — detects LPG/i-butane/propane/methane/alcohol/hydrogen/smoke (broad, general-purpose).
- Gravity: Arduino CO/Combustible Gas Sensor (MQ9) ($13.10) — focused on CO + combustible gases (methane/propane).
- Methane CNG Gas Sensor - MQ-4 ($14.95) — methane / natural gas.
- LPG Gas Sensor - MQ-6 ($14.95) — propane/butane (LPG).
- Hydrogen Gas Sensor - MQ-8 ($16.00) — hydrogen.
- Alcohol Gas Sensor - MQ-3 ($18.35) — alcohol / breathalyzer-style sensing.
- If you already have an MQ “can” sensor and need an adapter/carrier: Gas Sensor Breakout ($3.05) or Pololu Carrier for MQ Gas Sensors (Bare PCB Only) ($2.25).
Indoor air quality / VOC sensing (digital I2C breakouts)
- SGP41 VOC & NOx Gas Sensor Breakout ($49.05) — I2C sensor for VOC + NOx indices (great for IAQ projects).
- Adafruit ENS160 MOX Gas Sensor - Sciosense CCS811 Upgrade ($45.40) — I2C MOX gas sensor aimed at IAQ/eCO2/TVOC-style outputs.
- Adafruit MiCS5524 CO, Alcohol and VOC Gas Sensor Breakout ($30.80) — analog-style breakout useful for CO/alcohol/VOC type detection.
CO2 sensors (choose “true CO2” when you need real ppm)
- Gravity: STCC4 True Carbon Dioxide (CO2) Sensor (3-in-1 Air Quality Monitoring, 400 ~ 5000ppm) ($36.65) — 400–5000 ppm, compact option for typical indoor monitoring.
- Adafruit SCD-30 - NDIR CO2 Temperature and Humidity Sensor - STEMMA QT / Qwiic ($131.55) — true NDIR CO2 with temperature + humidity, good accuracy for IAQ.
- For building/industrial style installs: DFRobot SEN0659 Industrial RS485 NDIR CO2 Sensor - 400-5000ppm ($142.60) — RS485, IP65, 400–5000 ppm.
Factory-calibrated specialty gas sensors (higher cost, better specificity)
- Gravity Calibrated NH3 Ammonia Sensor - I2C/UART ($336.60) — calibrated ammonia (NH3) with analog/I2C/UART outputs.
- Gravity HF Gas Sensor (Calibrated) - I2C/UART/Analogue ($611.95) — calibrated hydrogen fluoride (HF) with analog/I2C/UART outputs.
What gas (or use-case) are you trying to measure?
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Showing 41-57 of 57 products · 3 unavailable products hidden
ELECFREAKS PlanetX CO2 Sensor
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The gas sensor is an essential sensor for environmental detection. The ELECFREAKS PlanetX CO2 Sensor is designed to detect the concentration of CO2 with high sensitivity. The higher the concentration of CO2 is, the smaller the output voltage value will be. At the same time, it can eliminate the i...
5V 3A Dual USB Step Down Buck Converter Module
This dual-USB step-down buck converter accepts 8–32V DC input and delivers a regulated 5V output at up to 3A across two USB Type-A ports simultaneously. With over 85% conversion efficiency and built-in reverse-connection and overload protection, it provides a compact and reliable way to power USB...
F1031V Mass Air Flow Sensor
F1031V Mass Air Flow Sensor adopts thermodynamic principle to detect flow rate of gas medium in the flow channel, with high precision and good repeatability. It comes with built-in temperature sensor to provide temperature compensation for measured data. Meanwhile, the sensor has liner analog vol...
Fermion: BME688 AI Environmental Sensor (VOC, Temperature, Humidity, Pressure)
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The BME688 AI Environmental Sensor is a highly advanced MEMS sensor that combines temperature, humidity, barometric pressure, and VOC detection in a single, compact package. Featuring ±0.5°C temperature accuracy, ±3% humidity accuracy, and ±0.6 hPa pressure accuracy, it offers reliable env...
45W DC-DC Converter 9V@5A
A waterproof DC-DC step-down (buck) converter that accepts 16–36V DC input and outputs a stable 9V at up to 5A (45W). The sealed, shockproof enclosure and 96% efficiency make it well suited for robotics, vehicles, and outdoor installations where reliable voltage regulation is needed. Key Feature...
Goteck micro metal gear servo (2.5kg)
This is a metal gear servo(2.5kg) from Goteck.It's very small, lightweight, and powerful! Metal gear for longer wear life and extra strength in demanding applications. Perfect for use in medium-sized electric airplanes,helicopters or mini Robots. SPECIFICATIONS Operating voltage...
Buck-Boost DC/DC Converter 8-36V to 12V 6A
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When your system needs a stable 12V rail from a variable DC supply, this industrial-grade buck-boost converter is built to deliver. It accepts a wide 8 to 36VDC input range and regulates it to 12V for loads up to 6A, or 72W.The buck-boost design automatically switches between stepping voltage dow...
Buck/Boost Converter - 8-40V to 12V/3A
An industrial-grade DC buck-boost converter that accepts 8–40V input and delivers a regulated 12V output at up to 3A (36W). Ideal for battery-powered systems where input voltage varies — such as SLA or LiFePO4 batteries powering routers, Wi-Fi equipment, or other 12V loads — this module automatic...
DIY Gas Detector - Learn to solder
MQ-2 Gas Sensor - Smoke & Flammable Gas Detector The MQ-2 is a reliable, easy-to-use gas sensor that’s ideal for detecting flammable gases like LPG, methane, propane, and even smoke. At its core is tin dioxide (SnO₂), a material with low conductivity in clean air. But when flammable gas is pres...
DC-DC 12V To 3.3V 5V Buck Step down Power Supply Module For Arduino
One input: DC 6V - 12V (input voltage to the output voltage must be higher than 1V.) Output: 3.3V (+ - 0.05v error), 5.0V (+ - 0.05v error), 800mA (load current can not exceed 800ma), 12V (12V input directly converter to the output) PCB board size: 4.5cm * 4.5cm With red power indicator le...
DC-DC Multi-output Buck Converter (3.3V/5V/9V/12V)
Multiple-output DC–DC converters are essential in a multitude of applications where different DC output voltages are required.This DC-DC step-down voltage power module converts 7.5V~30V input to an output of 3.3V/5V/9V/12V (default to 5V), which can be selected by short-circuiting the correspondi...
Metal DC Geared Motor - 6V 191RPM 1Kg.cm
This is a metal DC geared motor, 34:1 metal reducer. It has a small size and large torque. The maximum torque could arrive 1 kg.cm. It is stable and durable! SPECIFICATIONS Rated Voltage: 6 V Operating Voltage Range 2~7.5V Gear reduction ratio: 34:1 Gearbox lengt...
Metal DC Geared Motor - 6V 162RPM 1.2Kg.cm
A compact metal DC geared motor with a 45:1 reduction gearbox, delivering up to 1.2 kg·cm of torque. The all-metal gears provide durability and stability for robotics and mechanical projects. Features a D-shaped 4 mm output shaft. Specifications Rated Voltage – 6V DC Operating Voltage – 2–7.5...
VL53L1X Time of Flight (ToF) Sensor Breakout
The VL53L1X Time of Flight sensor breakout uses a low-power laser to measure distances with excellent accuracy and speed. With a detection range of 4 cm to 4 metres and up to 50 Hz sampling frequency, it's ideal for proximity sensing, presence detection, and collision avoidance on robots. This b...
AltIMU-10 v5 Gyro, Accelerometer, Compass, and Altimeter (LSM6DS33, LIS3MDL, and LPS25H Carrier)
The Pololu AltIMU-10 v5 is a compact inertial measurement unit (IMU) and altimeter that combines a gyroscope, accelerometer, magnetometer, and barometric pressure sensor on a single board. It provides ten independent measurements — pressure, 3-axis rotation, 3-axis acceleration, and 3-axis magnet...
Brushless DC Motor with Encoder 12V 159RPM
INTRODUCTION This is a motor revolution: a new DC brushless motor with built-in motor driver. It can be conncected to Arduino directly without external motor driver. Whatsmore, the motor comes with directional control, PWM speed control and speed feedback output, which make this motor t...
TOF Sense Laser Range Sensor (5m)
TOF Sense is a TOF-based (Time of Flight) laser ranging sensor that offers 1cm-5m detection range, 1mm resolution, ± 1.5cm error, and 10Hz data update frequency. The sensor supports 15 ° ~ 27 ° adjustable FOV, UART and CAN communication (selected by setting). Besides, it allows users to actively ...
