KE4029 Keyes DIY Electronic Brick MQ-2 Analog Gas Sensor

KE4029 Keyes DIY Electronic Brick MQ-2 Analog Gas Sensor

1. Introduction
The Keyes 2021 New DIY Electronic Brick MQ-2 Gas Sensor is a module designed to detect various gases (such as methane, liquefied petroleum gas, etc.). It is suitable for gas alarms, air quality monitoring, and smart home systems. With high sensitivity and stability, this module serves as an ideal tool for monitoring environmental gas concentrations.

2. Features
- Eco-Friendly Material: The module uses black eco-friendly materials compliant with modern safety standards.
- Multi-Gas Detection: Capable of detecting multiple gases, including methane and LPG, making it adaptable to various scenarios.
- Anti-Reverse Interface: Equipped with a yellow anti-reverse connector to ensure secure connections.
- Wide Compatibility: Compatible with microcontrollers like Arduino and Raspberry Pi for easy project integration.
- Easy Installation: Simplified wiring design suitable for beginners and DIY projects.

3. Specifications
| Parameter | Description |
|-------------------|--------------------------------------|
| Model | KE4029 |
| Sensor Type | MQ-2 Gas Sensor |
| Cable Length | 200mm |
| Operating Voltage | DC 5V |
| Interface Type | 2.54mm Pitch Anti-Reverse Interface |
| Detection Range | 300 to 10,000 ppm |
| Power Consumption | Approx. 150mA (at 5V operation) |

4. Working Principle
The MQ-2 gas sensor operates based on chemical sensing principles. Its workflow is as follows:
- Power Connection: The module connects to a power supply via VCC and GND, supporting DC 5V operation.
- Signal Output: Gas concentration is measured by reading analog voltage signals. When the concentration exceeds a set threshold, the module outputs a corresponding signal.

5. Pin Description
| Pin Name | Description |
|----------|-----------------------------------------------------------------------------|
| VCC | Positive power supply connection (DC 5V input) |
| GND | Negative power supply connection |
| A0 | Analog output for detecting gas concentration |
| D0 | Digital output; outputs a high-level signal when the threshold is exceeded |