Gas
Gas Sensor
- Overview
- Commands
- Samples
- On-Module Code
A swappable gas sensor module with a socket for MQ-series sensors — ships with MQ-7 (carbon monoxide) installed but accepts MQ-3 (alcohol), MQ-2 (smoke/LPG), MQ-135 (air quality), and other compatible elements. The on-board heater control circuit drives the sensor at the correct duty cycle, and the host reads concentration values with simple text commands over any supported interface.
Common uses: CO alarms, breathalyzer demos, gas leak detection, fermentation monitoring, and air-quality experiments where you want to compare sensor types.
The MQ element is not auto-identified — recalibrate thresholds in your code after swapping.
Key features • Gas Sensing | Resources 📄 Schematics PID: 0x06000A |
Modules ship without cables to reduce waste. Some specialty boards include a USB cable; for the rest, see Cables to add cables to your order.
Commands this module accepts. See Samples for runnable code in popular host languages.
| Function | Description |
|---|---|
Heater(s) | Sets the heater s state (1 on, 0 off). |
Read() | Reads the current voltage level in Volts. |
DVer() | This driver version. |
Peek under the hood
The script below is this module's driver — it teaches the hardware how to respond to the commands listed above. It ships pre-loaded from the factory; most users never need to open it.
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Example code that calls this module's commands from popular host languages.
New here? See Get Started to connect a module and send your first command.
- Python
- MicroPython
- JavaScript
- .NET
- Arduino
- MicroBlocks
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This sample runs in MicroBlocks on a any host board that's connected/tethered to this module, or a chain of modules. This module keeps its official DUELink firmware and module driver and responds to commands from the connected MicroBlocks-running host. New here? See the MicroBlocks page.
There are two ways to use it:
Open the full sample — the complete project (the module's library plus a ready-to-run example) opens directly on the MicroBlocks website.
Add just the libraries to your own project — copy the link, then in your MicroBlocks project click Add Library → Cloud and paste it. This loads this module's libraries into your project without replacing your current work.
Copy Library LinkCode that runs directly on this module's MCU. See how On-Module Code allows modules to run standalone.
- Script
- Arduino IDE
This example runs using the default DUELink Internal Engine using its Scripting Language, and it expects the module's driver to be loaded first, see the Commands Tab.
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See Arduino IDE page for more info.
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Ordering Info
| Product | Part Number | Price |
|---|---|---|
| DUELink Gas (MQ7 CO) | GDL-SEGAS-B-MQ7 | $14.95 |