MQ-3 Alcohol Gas Sensor Module for Breath Analyzer Projects
MQ-3 Alcohol Gas Sensor Module – High Sensitivity for Breathalyzers
The MQ-3 gas sensor module detects alcohol vapors with high sensitivity and fast response. It is commonly used in breathalyzer projects, alcohol detection systems, and environmental monitoring. The module provides a convenient analog output that can be read by microcontrollers like Arduino.
Key Specifications
| Specification | Value |
|---|---|
| Detection Gas | Alcohol (Ethanol) |
| Detection Range | 0.05 – 10 mg/L |
| Operating Voltage | 5V DC |
| Output Type | Analog (0–5V) |
| Dimensions | Approx. 32 x 22 x 27 mm |
| Heating Resistance | 33Ω ± 10% |
What You Can Build With This
- DIY breathalyzer with LCD display
- Alcohol detection alarm for vehicles
- Portable alcohol tester with microcontroller
- Smart IoT alcohol monitoring system
Compatibility
Works with any microcontroller that supports analog input, such as Arduino Uno, ESP32, ESP8266, and Raspberry Pi. Operates at 5V logic level, but can be used with 3.3V boards by using a level shifter for analog output.
Wiring Notes
Connect VCC to 5V, GND to ground, and AOUT to an analog input pin. Allow a preheat time of about 1-2 minutes for stable readings. Use the on-board potentiometer to adjust the threshold for digital output (DOUT) if needed.
Why Buy from Compoden
Every component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.
Is this compatible with Arduino?
Yes, the MQ-3 sensor module works directly with Arduino boards. Connect the analog output to any analog pin and power with 5V from the Arduino.
Can it detect other gases like smoke?
The MQ-3 has high selectivity for alcohol and low sensitivity to smoke and gasoline, making it ideal for alcohol-specific detection.
What is the preheat time required?
The sensor requires about 1-2 minutes of preheating to give stable readings. This is normal for metal oxide semiconductor sensors.
📦 Free Setup Handoff Document Included
Every Compoden order includes a free setup handoff document — step-by-step instructions to get your component working within minutes. Download it via QR code on your package. The handoff document is also trained to help you troubleshoot the majority of problems.
Ask Soldr above what you can build with this — it knows every Compoden kit this part appears in.
Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items