Overview
The MQ-3 alcohol sensor is suitable for detecting alcohol or ethanol concentration in your breath, just like a normal breathalyzer. It has a high sensitivity and fast response time . The sensor provides an analog resistive output based on alcohol concentration. The drive circuit is very simple, all it needs is one resistor.
Features
- Continuous Analog output
- 3-pin interlock connector
- Low cost and compact size
- Operation Temperature: -10 to 70 degrees C
- Heater consumption: less than 750mW
Standard Working Condition
| Symbol | Parameter Name | Technical Condition | |
| VC | Circuit voltage | 5V±0.1 | |
| VH | Heating voltage | 5V±0.1 | |
| RL | Load resistance | adjustable | |
| RH | Heater resistance | 33Kohm±5% | |
| PH | Heating consumption | Less than 800mW |
Resources
- Datasheet
- Arduino Tutorial in Portuguese
- Arduino Breathalyzer
MQ-* Gas Sensor Selection Table
Check out the right sensor you need for the right gas
| Part Number | Sensitive Gas | Application |
|---|---|---|
| MQ-135 Gas Sensor | benzene, alcohol, smoke | Air quality monitor |
| MQ-2 Gas Sensor | LPG, propane, hydrogen, smoke | Gas leakage detector, fire alarm, smoke detector |
| MQ-3 Gas Sensor | alcohol, ethanol | Car alcohol alarm, breathalyser |
| MQ-5 Gas Sensor | LPG, natural gas, coal gas | Gas leakage detector |
| MQ-7 Gas Sensor | carbon monoxide | Carbon monoxide monitor |
Gilbert dzameshi (verified owner) – :
better
Joseph Newman (verified owner) – :
Ok..eventhough not yet function tested. Pins were bent due to handling and packing