Unit MQ
SKU:U199
Description
Unit MQ is a combustible gas detection unit based on the semiconductor gas sensor (MQ-5), integrated with an MCU (STM32G030F6P6). It is mainly used for detecting combustible gases (such as propane, methane, etc.) in the environment. This unit communicates with various host devices via the I2C interface and can obtain internal reference voltage, sensor voltage, 12-bit and 8-bit ADC raw values, firmware version, thermistor temperature, and other information. It supports two heating modes to bring the sensor to the optimal operating temperature: continuous heating mode and intermittent heating mode. In continuous heating mode, the sensor heats up faster and responds with data more quickly. In intermittent heating mode, the heating cycle can be flexibly configured to optimize device power consumption. This product is suitable for various safety and monitoring applications such as smart homes, air quality detection, and industrial safety.
Features
- Built-in STM32 core controller
- I2C communication interface
- Supports detection of various combustible gases (such as LPG, methane, etc.)
- Supports two modes: continuous heating and intermittent heating with customizable periods
- Integrated thermistor for device temperature monitoring
- Readable internal reference voltage and sensor voltage
- Standard MQ sensor interface, compatible with multiple sensors (such as MQ-2, MQ-3, MQ-7, MQ-135, etc.)
- Development Platform:
- Arduino
- UiFlow2
Includes
- 1 x Unit MQ
- 1 x HY2.0-4P Grove Cable (20cm)
Applications
- Smart home
- Air quality detection
- Industrial safety
Specifications
| Specification | Parameter |
|---|---|
| MCU | STM32G030F6P6@32-bit ARM Cortex-M0+ processor |
| Sensor | MQ-5 combustible gas sensor |
| Communication Interface | I2C @0x11, address configurable |
| Operating Current | Off mode: DC 5.02V@6.88mA Continuous heating mode: DC 5.05V@188.89mA |
| Detected Gases | LPG, methane |
| Detection Range | 300 ~ 10000ppm (methane, propane) |
| Recommended Preheat Time in Continuous Heating Mode | 20s |
| Product Size | 64.0 x 24.0 x 25.0mm |
| Product Weight | 19.3g |
| Package Size | 138.0 x 93.0 x 25.0mm |
| Gross Weight | 24.7g |
Schematics
PinMap
| HY2.0-4P | Black | Red | Yellow | White |
|---|---|---|---|---|
| PORT.A | GND | 5V | SDA | SCL |
Model Size
Datasheets
Softwares
Arduino
Internal Firmware
Protocol
Data Valid Flag and Control Pin Level States in Different Modes
- Off Mode:
- Continuous Heating Mode:
- Intermittent Heating Mode (In the following Figure 1 and Figure 2, the high/low level time of the control pin is different, but the data valid flag becomes effective after 20s of continuous high level, and becomes invalid immediately after switching to low level):
Figure 1:
Figure 2:
Video
- Unit MQ Function Introduction