1. Introduction
The Keyes MQ-3 Alcohol Sensor, a new 2021 DIY electronic building block, is a high-performance gas sensor specifically designed for detecting alcohol concentrations in the air. Leveraging its sensitivity and response speed, the module is widely used in alcohol testers, smart home systems, and security applications.
2. Features
- Environmentally friendly materials : The black environmentally friendly materials used meet modern safety standards.
- High sensitivity : It can accurately detect changes in alcohol in the air, making it easy to monitor alcohol concentration.
- Anti-reverse insertion interface : Equipped with yellow anti-reverse insertion terminals to ensure safe and reliable connection.
- Wide compatibility : The module is compatible with control boards such as Arduino and Raspberry Pi, making it suitable for a variety of project applications.
- Easy to install : Simplified wiring design, suitable for beginners and DIY projects.
3. Specifications
|
parameter |
describe |
|---|---|
|
model |
KE4028 |
|
Sensor type |
MQ-3 alcohol sensor |
|
Wire length |
200mm |
|
Operating voltage |
DC 5V |
|
Interface type |
Anti-reverse interface with a spacing of 2.54mm |
|
Detection concentration range |
0.4-4.0 mg/L |
|
Power consumption |
Approximately 150mA (when operating at 5V) |
4. Working Principle
The MQ-3 sensor detects alcohol concentration using a chemical reaction principle. The working process is as follows:
- Power connection : Connect to the power supply via VCC and GND. The module supports DC 5V operation.
- Signal output : By reading the analog voltage signal, the change in the concentration of alcohol in the air can be determined, and the corresponding level is output for judgment.
5. Foot position description
|
Pin Name |
describe |
|---|---|
|
VCC |
Connect the positive power supply terminal; supports DC 5V input. |
|
GND |
negative power connection |
|
A0 |
Analog output terminal, detects alcohol concentration |
|
D0 |
The digital output terminal outputs a high level when the threshold value is exceeded. |