KE4028 Keyes DIY Electronic Brick MQ-3 Alcohol Sensor

KE4028 Keyes DIY Electronic Brick MQ-3 Alcohol Sensor

1. Introduction
The Keyes 2021 New DIY Electronic Brick MQ-3 Alcohol Sensor is a high-performance gas sensor specifically designed to detect alcohol vapor concentration in the air. With its high sensitivity and fast response time, this module is widely used in breathalyzers, smart home systems, and security applications.

2. Features
- Eco-Friendly Material: Manufactured with black eco-friendly materials meeting modern safety standards.
- High Sensitivity: Accurately detects changes in alcohol concentration for reliable monitoring.
- Anti-Reverse Interface: Equipped with a yellow anti-reverse connector ensuring secure and reliable connections.
- Wide Compatibility: Compatible with development boards like Arduino and Raspberry Pi, suitable for diverse projects.
- Easy Installation: Simplified wiring design ideal for beginners and DIY applications.

3. Specifications
| Parameter | Description |
|-------------------|--------------------------------------|
| Model | KE4028 |
| Sensor Type | MQ-3 Alcohol Sensor |
| Cable Length | 200mm |
| Operating Voltage | DC 5V |
| Interface Type | 2.54mm Pitch Anti-Reverse Interface |
| Detection Range | 0.4-4.0 mg/L |
| Power Consumption | Approx. 150mA (at 5V operation) |

4. Working Principle
The MQ-3 sensor operates based on chemical reaction principles to detect alcohol concentration:
- Power Connection: The module connects to a power supply via VCC and GND, operating at DC 5V.
- Signal Output: Alcohol concentration is measured by reading analog voltage signals. The digital output pin triggers a high-level signal when the concentration exceeds a predefined threshold.

5. Pin Description
| Pin Name | Description |
|----------|-----------------------------------------------------------------------------|
| VCC | Positive power supply connection (DC 5V input) |
| GND | Negative power supply connection |
| A0 | Analog output for real-time alcohol concentration detection |
| D0 | Digital output; produces high-level signal when threshold is exceeded |