Little Bird
Alcohol sensor for Arduino
An alcohol sensor module for Arduino with both digital (TTL) and analog output. It detects alcohol vapour in the 10–1000 PPM range, with analog output voltag...
Get notified when back in stock
An alcohol sensor module for Arduino with both digital (TTL) and analog output. It detects alcohol vapour in the 10–1000 PPM range, with analog output voltage increasing proportionally with concentration. The module also responds to LPG, natural gas, city gas, and smoke.
The board features a power indicator LED, a potentiometer for adjusting the digital threshold, and a simple 4-pin interface (VCC, GND, DO, AO) for direct connection to Arduino or other microcontrollers.
Key Features
- Dual Output – Digital (TTL) switch output and analog voltage output
- Detection Range – 10–1000 PPM alcohol
- Analog Output – 0.1–0.3V (clean air) up to ~4V (high concentration)
- Digital Output – TTL low when threshold exceeded
- Power Indicator – On-board LED
- Fast Response – Rapid response and recovery
Specifications
- Input Voltage – 5V DC
- Current Draw – 150mA
- DO Output – TTL (0.1V / 5V)
- AO Output – 0.1V to ~4V
Pin Connections
- VCC – 5V positive
- GND – Ground
- DO – Digital TTL switch output
- AO – Analog signal output
Ideal For
- Breathalyser and alcohol detection projects
- Air quality monitoring with Arduino
- Gas detection and environmental sensing
Package Contents
- 1× Alcohol sensor module
Jargon buster
Plain-language definitions for the technical terms used above.
- DC
- DC means direct current, where electricity flows in one constant direction, as supplied by batteries, USB ports and many plug-pack power supplies. When a product specifies DC, it runs from a DC supply rather than mains AC, so you need to provide the correct voltage and polarity.
- GND
- GND is the ground or reference connection (0 V) for a circuit. When connecting two devices together, their grounds must be joined so both agree on what counts as a low or high signal.
- LED
- A light-emitting diode (LED) is a small electronic component that emits light when current flows through it in the correct direction. Because it only conducts one way, its polarity matters, and a through-hole LED must be soldered the correct way around to light up.
- potentiometer
- A variable resistor usually turned with a knob or shaft to create an adjustable electrical signal. It is often used for inputs such as volume, brightness or position, so it helps beginners learn how a microcontroller reads changing values.
- ppm
- ppm means parts per million, a common way to express very small gas concentrations in air. For CO₂ sensors, the ppm range tells you what levels the sensor can measure, such as normal indoor air through to poorly ventilated spaces.
- VCC
- VCC is the positive power-supply connection on a chip or module. Connecting it to the correct supply voltage is needed for the part to power on and helps avoid damaging the electronics.
Find this product in
Project Guides
Step-by-step builds that use this part
Related Tutorials
Free guides on learn.littlebird.com.au
