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air_quality_monitor_ii [2020/03/29 13:02] – [Key features] tedemair_quality_monitor_ii [2021/06/11 03:53] (current) – [Overview] werk_ag
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 ====== Air Quality Monitor II ====== ====== Air Quality Monitor II ======
 +
  
 ===== Overview ===== ===== Overview =====
 +
 +**NOTE: There is a new version of this device, the [[:air_quality_monitor_iii|]]**
  
 The WeatherDuino Air Quality Monitor II measures PM2.5 and PM10 dust particles which are important indicators of air pollution.\\ The WeatherDuino Air Quality Monitor II measures 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 using [[https://en.wikipedia.org/wiki/NowCast_(air_quality_index)|Nowcast]] functions.\\+Based on the PM2.5 and PM10.0 readings, the Air Quality Index is computed. User can chose USA (EPA), Europe (EAQI), UK (DAQI) or Australian (AQC) standards,\\
 The Air Quality Monitor can also be used to monitor CO<sub>2</sub> levels in a room, greenhouse or outside.<sup>3)</sup>  \\ The Air Quality Monitor can also be used to monitor CO<sub>2</sub> levels in a room, greenhouse or outside.<sup>3)</sup>  \\
 \\ \\
 The AQM II was designed to be installed in places with WiFi Coverage. It can also work without a WiFi connection but several functions will be unavailable. The AQM II was designed to be installed in places with WiFi Coverage. It can also work without a WiFi connection but several functions will be unavailable.
  
-If WiFi isn't available at the location where you intend to install it, you will need to use the previous version of the Air Quality Monitor (available while stocks last). +{{https://www.meteocercal.info/forum/videos/AQM_II.mp4|AQM_II.mp4}}
- +
-{{https://www.meteocercal.info/forum/videos/AQM_II.mp4}}+
  
  
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-=====  What is needed and is not included:  =====+===== 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.\\+- Power supply: 5V - 500mA. Average consumption is below 100mA, but when the sensors are being read, power requirement increases.\\
 - Temperature / Humidity sensor (HTU21D or SHT31)\\ - Temperature / Humidity sensor (HTU21D or SHT31)\\
-- [[http://www.winsen-sensor.com/d/files/infrared-gas-sensor/mh-z19b-co2-ver1_0.pdf|MH-Z19B]] CO2 sensor (can be assembled directly on the PCB with or without a socket, user choice).\\ +- [[http://www.winsen-sensor.com/d/files/infrared-gas-sensor/mh-z19b-co2-ver1_0.pdf|MH-Z19B]] CO<sub>2</sub> 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:\\+- One dust particle sensor. Currently two models of dust particle sensors are supported: 
   * [[http://aqicn.org/sensor/pms5003-7003/|PMS7003]], from the well known brand [[http://www.plantower.com/en/content/?110.html|Plantower]].<sup>1)</sup>   * [[http://aqicn.org/sensor/pms5003-7003/|PMS7003]], from the well known brand [[http://www.plantower.com/en/content/?110.html|Plantower]].<sup>1)</sup>
   * [[http://aqicn.org/sensor/sds011|Nova SDS011]] made by [[http://www.inovafitness.com/en/a/chanpinzhongxin/95.html|Inovafitness]].   * [[http://aqicn.org/sensor/sds011|Nova SDS011]] made by [[http://www.inovafitness.com/en/a/chanpinzhongxin/95.html|Inovafitness]].
 +
 +Several scientific reports are listed at the bottom of this web page giving more information on these sensors and evaluating their performance.
  
  
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 ===== Technical Data ===== ===== Technical Data =====
  
-Power Requirements: 5VDC 500mA +Power Requirements: 5VDC 500mA Microcontroller: 32-bit Tensilica L106 microcontroller\\ 
-Microcontroller: 32-bit Tensilica L106 microcontroller \\ +Dust Sensor: PMS7003 or Nova SDS011\\ 
-Dust Sensor: PMS7003 or Nova SDS011 \\ +CO<sub>2</sub> Sensor: MH-Z19 (optional)\\ 
-CO2 Sensor: MH-Z19 (optional) \\ +RF Frequency: 433Mhz or 315Mhz <sup>4)</sup> 
-RF Frequency: 433Mhz or 315Mhz <sup>4)</sup>\\+
  
 ===== Custom Box for the WeatherDuino Air Quality Monitor II ===== ===== Custom Box for the WeatherDuino Air Quality Monitor II =====
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-==== Footer Notes ====+==== Footnotes ==== 
 + 
 +<sup>1)</sup>  - The very expensive PurpleAir Air Quality Monitor uses a Plantower dust sensor (model PMS5003, which is older than the PMS7003 used on WeatherDuino AQM).\\ 
 +<sup>2)</sup>  - See [[:weatherduino_receivers#weatherduino_receivers_-_comparison_chart|systems compatibility here]].\\ 
 +<sup>3)</sup>  - Accurate measurement of CO<sub>2</sub> concentration in the open air is a very complicated task, not achievable with simple equipment. According to its published specifications the error margin of a MH-Z19 sensor is 50ppm\\ 
 +<sup>4)</sup>  - Must match the frequency used by other Transmitter units. 
 +==== A few examples of the use of the PMS7003 dust sensor from the scientific literature ====
  
-<sup>1)</sup>   - 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). \\ <sup>2)</sup>   - See [[:weatherduino_receivers#weatherduino_receivers_-_comparison_chart|systems compatibility here]]. \\ +Badura, M., Batog, P., Drzeniecka-Osiadacz, A. and Modzel, P (2018) Evaluation of Low-Cost Sensors for Ambient PM<sub>2.5</sub> Monitoring. Journal of Sensors, Article ID 5096540, 16 pages. [[https://doi.org/10.1155/2018/5096540|https://doi.org/10.1155/2018/5096540]]
-<sup>3)</sup>   - Precision measure of CO<sub>2</sub>  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 \\ <sup>4)</sup>   - Must match the frequency used by other Transmitter units.+
  
 +Johnston, S.J. and nine others (2019) City Scale Particulate Matter Monitoring Using LoRaWAN Based Air Quality IoT Devices. Sensors 2019, 19, 209; doi:10.3390/s19010209. [[https://www.mdpi.com/1424-8220/19/1/209|https://www.mdpi.com/1424-8220/19/1/209]]
  
  

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