MQ-3 Alcohol Ethanol Detection Sensor Module

The MQ-3 Alcohol Sensor Module detects alcohol (ethanol) vapour in the air using a heated tin-dioxide sensing element whose resistance drops as alcohol concentration rises. The board provides an analog output proportional to concentration and a digital output that switches when the level passes a threshold set by the on-board potentiometer.

MQ-3 Alcohol Sensor Module – Key Features

• Sensor: MQ-3 (SnO2) gas sensor
• High sensitivity to alcohol / ethanol vapour
• Analog output (AO) and digital output (DO)
• Adjustable threshold potentiometer
• Power and output indicator LEDs
• Supply voltage: 5V (heater)
• 4 pins: VCC, GND, DO, AO

Applications

Makers, students and engineers use it in projects such as:

• Breathalyzer and alcohol tester projects
• Vehicle alcohol interlock demos
• Alcohol vapour leak detection
• Science fairs and school projects

Usage Tips

Preheat the sensor for at least a few minutes before reading (24–48 hours burn-in on first use gives the most stable results). Calibrate in clean air and keep it away from humidity and wind for consistent readings. This module is for learning and projects, not for legal alcohol testing.

Why Buy from Most Electronics?

Most Electronics is an electronics components store in Cairo serving engineers, students, makers and repair shops across Egypt. Every order is checked before it ships, prices are clear, and our team can help you choose compatible parts for your project.

• Original and tested stock
• Cash on delivery and fast shipping to all governorates
• Pickup available from our Cairo branch
• Technical support on WhatsApp before and after purchase

Ordering, Delivery and Support

Ordering from Most Electronics is simple. Add the item to your cart, choose home delivery or pickup from our Cairo branch, and pay cash on delivery or by the available online methods. Orders inside Cairo and Giza usually arrive within one to two working days, and shipments to other governorates normally take two to four working days depending on the courier.

Every product is inspected before packing, and sensitive parts are packed in protective bags to prevent damage during shipping. If anything arrives faulty or different from what you ordered, contact our support team on WhatsApp and we will arrange a replacement according to our return policy.

Not sure which part fits your project? Send us a message with your circuit or project idea and our engineers will help you choose compatible modules, power supplies, cables and accessories, so you can order everything you need in one go and start building right away.

Package Includes

1 × MQ-3 alcohol sensor module.

MQ-3 Alcohol Sensor Module – Frequently Asked Questions

Where can I buy it in Egypt?
You can order it online from Most Electronics and pay on delivery, or collect it from our store in Cairo.

Can I order more than one piece?
Yes. Set the quantity you need in the cart; quantity discounts may apply on selected items.