Air Quality Monitor II


The WeatherDuino Air Quality Monitor II measure PM2.5 and PM10 dust particles which are important indicators of air pollution.
Based on the PM2.5 readings, and in accordance with EPA standards the Air Quality Index is computed by using Nowcast functions.
The Air Quality Monitor can also be used to monitor CO2 levels in a room, greenhouse or outside.3)

The AQM II was designed to be installed in places with WiFi Coverage. It also can work without WiFi connection, however several of their functionalities will be unavailable.
If WiFi isn't available on the location where you intend to install it, you may consider the use of the previous version of the Air Quality Monitor, still available.

Key features

- Can be used by any person (doesn't require having an WeatherDuino Weather Station) for monitoring the Air Quality in any place of your home, indoor or outdoor.
- Can transmit Air Quality and T/H data to WeatherDuino receivers (when equipped with the RF transmitter).
- OLED display (Optional item. You may not install the OLED display, per example in a unit which is operating outdoor to send data to an WeatherDuino receiver).
- Can upload Air Quality data to online services like Thinkspeak, or to your own server (ex: to store data on a database).
- Several units can be used to form Air Quality Network. When a unit receives an HTTP GET it sends back the Air Quality data in JSON format.
- Powered via micro USB connector or connector on the PCB.
- Software can be upgraded by Over the Air (OTA). Requires WiFi connection.

Picture below shows what you get on an WeatherDuino receiver, when the Air Quality Monitor II is setup to transmit data over radio frequency.

What is needed and is not included:

- Power supply: 5V - 500mA. Average consumption is bellow 100mA, but when the sensors are being read, power requirement increases.
- Temperature / Humidity sensor (HTU21D or SHT31)
- MH-Z19B CO2 sensor (can be assembled directly on the PCB with or without a socket, user choice).
- One dust particle sensor. Currently two models of dust particle sensors are supported:

Optional Items

- 1.3“ OLED display (4 pins - I2C interface)
- H34C ASK 433Mhz transmitter plus SMA connector (can be supplied assembled on the PCB, ask for it when ordering)

Outdoor install recommendations

Install the AQM II in a box with vent holes, away from any source of smoke, in a well ventilated place, but not directly exposed to weather elements, like rain, strong winds or direct sunlight.
As an example, a well ventilated porch is a good place.
Preferably install the AQM II in a place with WiFi coverage.

Board Size

85.00mm x 49.60mm

Technical Data

Power Requirements: 5VDC 500mA Microcontroller: 32-bit Tensilica L106 microcontroller
Dust Sensor: PMS7003 or Nova SDS011
CO2 Sensor: MH-Z19 (optional)
RF Frequency: 433Mhz or 315Mhz 4)

1) - The very expensive PurpleAir Air Quality Monitor, uses an Plantower dust sensor (the model PMS5003, which is older than the PMS7003 used on WeatherDuino AQM).
2) - See systems compatibility here.
3) - Precision measure of CO2 concentration in open air, is a very complicated task, not achievable with simple equipment. According to specifications the error margin of an MH-Z19 sensor is 50ppm
4) - Must match the frequency used by other Transmitter units.

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