MQ3 Alcohol Ethanol Gas Sensor Module
MQ3 overview
MQ3 Alcohol Gas Sensor module is a part of the MQ gas sensor family that can detect the concentrations of alcohol gas in the air and outputs its reading as an analog voltage. The sensor can measure concentrations of 0.04mg/L to 4mg/L. The concentration sensing range is suitable for breathalyzers. The sensor can operate at temperatures from -10 to 50°C and consumes less than 150 mA at 5 V. MQ3 gas sensor has a high sensitivity to Alcohol and has good resistance to disturb of gasoline, smoke, and vapor.
The sensor could be used to detect alcohol with different concentrations, it is low cost and suitable for various applications. The sensing material of the MQ3 gas sensor is SnO2. When the target alcohol gas exists, The sensor’s conductivity is higher along with the gas concentration rising.
Key specifications
Datasheet
MQ3 features
- Sensor Type - Semiconductor
- Easy SIP header interface
- Compatible with most of the microcontrollers
- Low-power standby mode
- Requires heater voltage
- Good sensitivity to alcohol gas
- Fast response and High sensitivity
- Long life and low cost
- Requires simple Drive circuit
MQ3 pinout
| Name | Description |
|---|---|
| VCC | This pin powers the module, typically the operating voltage is +5V |
| GND | Used to connect the module to the system ground |
| Digital OUT | You can also use this sensor to get digital output from this pin, by setting a threshold value using the potentiometer |
| Analog OUT | This pin outputs 0-5V analog voltage based on the intensity of the gas |
MQ3 specifications
| Power requirements | 5 VDC @ ~165 mA (heater on) / ~60 mA (heater off) |
|---|---|
| Current Consumption | 150mA |
| DO output | TTL digital 0 and 1 ( 0.1 and 5V) |
| AO output | 0.1- 0.3 V (relative to pollution), the maximum concentration of a voltage of about 4V |
| Detecting Concentration | 0.05-10mg/L Alcohol |
| Interface | 1 TTL compatible input (HSW), 1 TTL compatible output (ALR) |
| Heater consumption | less than 750mW |
| Operating temperature | 14 to 122 °F (-10 to 50°C) |
| Load resistance | 200kΩ |
| Sensitivity S | Rs(in air)/Rs (0.4mg/L Alcohol)≥5 |
| Sensing Resistance Rs | 2KΩ-20KΩ(in 0.4mg/l alcohol) |
| Dimensions | 32 x 22 x 16 mm |
MQ3 applications
- Gas level over-limit alarm
- Breathalyzer
- Portable alcohol detector
- Stand-alone/background sensing device
- Environmental monitoring equipment
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