MQ-3 Alcohol Gas Sensor Module with Arduino Digital Trigger

Description

MQ-3 Alcohol Gas Detector Module with Digital Trigger for Arduino

100% New MQ3 MQ-3 Alcohol Ethanol Gas Detector Breath Detector Module

Brief Description:

(1). Dimensions: 32 mm X width 22 mm X height 27 mm

(2). Main chip: LM393, ZYMQ – 3 gas sensor

(3). Operating Voltage: DC 5V

(4). Features:

1, has signal output indicator.
2, dual signal output (analog output and TTL level output)
3, effective TTL level output signal for low level. (when a low electric light signal is emitted in ordinary times, it can be directly connected to SCM)
4, analog output voltage 0 ~ 5V, higher voltage indicates higher concentration.
5, has good sensitivity to ethanol vapor.
6, long-lasting and reliable stability
7, fast recovery response characteristics

(5). Application:

Used in personal vehicle guidance and other non-intoxicated personnel field detectors, and can also be used in other places to detect ethanol vapor

We have datasheets available for all components, if not present in the product download sheet, send us a message from the contact us form and we will publish it as soon as possible on our website.

Tutorial: How to use MQ-3

The MQ-3 sensor measures gasoline vapor age, useful for home security applications. Suitable for beginners and intermediate makers.

What you need

• Arduino Uno
• 5V power supply cable
• 10kΩ resistor
• Connection cable
• Gasoline or ethylene glycol acetate (ETG) for testing

Steps

1. 1. Connect the Arduino to a computer with the USB driver.
2. 2. Download the provided Sketch code.
3. 3. Connect the Arduino pin D10 to the VCC pin of the MQ-3 sensor.
4. 4. Connect the Arduino GND pin to the GND pin of the MQ-3 sensor.
5. 5. Connect the OUT pin of the sensor to pin A0 of Arduino through the 10kΩ resistor.
6. 6. Connect the GND pin of the sensor to the GND pin of Arduino.
7. 7. Load the Sketch code onto Arduino.
8. 8. Test the sensor with gasoline or ETG.

Example code

int sensorPin = A0; int sensorValue; void setup() { Serial.begin(9600); } void loop() { sensorValue = analogRead(sensorPin); Serial.println(sensorValue); delay(1000); }

Mini project

Create a gasoline gas safety alarm in 30 minutes using the MQ-3 sensor and Arduino.

Common mistakes

• Do not use a power supply other than 5V.
• Ensure that the 10kΩ resistor is correctly connected.
• Check the datasheet for the pull-up resistance.
• Do not use harmful gases to test the sensor.

Recommended accessories

• Different gas sensors for comparison
• 3.3V power supply cable
• Ethylene glycol acetate (ETG)
• Graph to display data

Frequently asked questions

Does the sensor work with other types of gas?
The MQ-3 sensor is specified for gasoline, but it can detect other fuels. Check the datasheet.

How long is the sensor’s lifespan?
Check the datasheet for the lifespan and usage conditions.

Can I use a different voltage than 5V?
Use only 5V, otherwise it will damage the sensor.