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Small green circuit board with silver sensor module and white Grove connector, rectangular shape with mounting holes

Seeed Studio

Seeed Studio Grove Alcohol Sensor MQ303A

SKU CH-SMXZ-M3WXE

Detects alcohol vapour from 20 to 1000 ppm with a fast response and Grove plug-and-play interface

  • TypeSensors
  • Detects low alcohol concentrations with high sensitivity
  • Responds quickly and recovers fast after exposure
  • Plug-and-play Grove socket simplifies wiring
  • Operates on 5 VDC with 120 mA heater current
  • Measures alcohol from 20 to 1000 ppm

Grove Alcohol Sensor MQ303A

The Grove Alcohol Sensor MQ303A is a compact module designed for detecting alcohol vapour in air. It connects through a Grove unified socket for direct plug-and-play use with Arduino or Seeeduino boards. The sensor targets breathalyser builds, DUI screening tools and alcohol volatilisation monitoring. Makers and developers who need a ready-to-use alcohol detection element will find it straightforward to integrate.

Sustained load behaviour

The on-board heater runs at 0.9 V and draws 120 mA continuously while the sensor is active. This steady power draw means the module maintains stable sensitivity during extended sampling sessions. Response remains fast and the sensor recovers quickly after each exposure, supporting repeated measurements without long cooldown periods. Projects requiring continuous monitoring over minutes or hours can rely on consistent output.

Detection range 20-1000 ppm

The sensor covers alcohol concentrations from 20 to 1000 ppm, which defines the limits of measurable vapour density. Concentrations below 20 ppm will not register reliably, while levels above 1000 ppm exceed the calibrated range. Builders needing detection outside this window must select a different sensor technology. The single TTL-compatible DAT pin delivers the inverse voltage signal for the microcontroller to interpret.

Highlights

  • Detects low alcohol concentrations with high sensitivity
  • Responds quickly and recovers fast after exposure
  • Plug-and-play Grove socket simplifies wiring
  • Operates on 5 VDC with 120 mA heater current
  • Measures alcohol from 20 to 1000 ppm

Specifications

TypeSensors

Questions about this item

How much heat and power does the 120 mA heater draw during continuous use?

The heater runs at 120 ± 20 mA from 5 VDC with a 0.9 V ± 0.1 V heater voltage; expect a slight temperature rise during all‑day operation.

Which microcontroller board and voltage level do I need to read the TTL DAT and SEL pins?

Any 5 V board with a Grove socket — Arduino or Seeeduino — supplies the required 5 VDC and accepts the TTL‑compatible DAT and SEL signals directly.

Will the 20‑1000 ppm alcohol range still register on an older 5 V Arduino without extra level shifting?

Yes, the module outputs a TTL‑compatible voltage inversely proportional to alcohol concentration, so legacy 5 V boards read the DAT pin without additional circuitry.

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