ElecFreaks
Octopus PM2.5 module
The Octopus PM2.5 module from ElecFreaks is a laser-based particulate matter sensor built around the ZH03B dust sensor. It measures PM2.5 concentration in th...
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The Octopus PM2.5 module from ElecFreaks is a laser-based particulate matter sensor built around the ZH03B dust sensor. It measures PM2.5 concentration in the air with high consistency and real-time response, capable of detecting particles as small as 0.3 µm in diameter.
Part of the Octopus electronic brick series, it features both a 3-pin GVS interface (PWM output) and a 4-pin serial output, making it compatible with micro:bit, Arduino, and other 3.3 V or 5 V microcontrollers.
Key Features
- ZH03B Laser Dust Sensor – High-accuracy PM2.5 concentration measurement
- 0.3 µm Minimum Particle Size – Detects fine particulate matter
- Dual Output – 3-pin GVS (3.3 V PWM) and 4-pin serial (3.3 V UART)
- 3.3 V / 5 V Compatible – Works with micro:bit, Arduino, and similar boards
- Real-Time Response – Continuous air quality monitoring
Specifications
- Sensor – ZH03B laser dust sensor
- Measurement – PM2.5 concentration (µg/m³)
- Minimum Particle Size – 0.3 µm
- Interfaces – 3-pin GVS (PWM) and 4-pin serial (UART)
- Operating Voltage – 3.3–5 V
Ideal For
- Air quality monitoring stations
- Environmental science projects with micro:bit
- Indoor air quality sensing
- Arduino and microcontroller pollution monitoring
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- Matter
- A smart home connectivity standard designed to let devices work across different ecosystems. It matters if you want a project to integrate more easily with platforms such as Apple Home, Google Home, or other Matter-compatible systems.
- microcontroller
- A microcontroller is a small computer on a single chip that runs a stored program and controls connected inputs and outputs such as buttons, sensors, displays and communication interfaces. In a device built around one, it is the part that executes the code and coordinates the device's behaviour.
- particulate matter
- Particulate matter means tiny particles suspended in the air, such as dust, smoke, pollen, or pollution. A sensor that measures it is useful for air-quality projects because particle levels can affect comfort and health.
- PM2.5
- PM2.5 refers to airborne particles with a diameter of about 2.5 micrometres or smaller. It is a common air-quality measurement because these fine particles can be breathed deep into the lungs.
- PWM
- Pulse Width Modulation is a way for a digital pin to simulate variable output power by switching on and off very quickly. It matters for controlling things like LED brightness, motor speed, or servo-style signals from a microcontroller pin.
- UART
- UART is a simple asynchronous serial interface that sends data over separate transmit and receive wires, usually labelled TX and RX, with both ends set to the same baud rate. It is a common way for microcontrollers and other serial devices to exchange data.
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