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air_quality_monitor_ii [2019/05/05 19:13]
werk_ag [Custom Box for the WeatherDuino Air Quality Monitor II]
air_quality_monitor_ii [2020/03/29 13:24] (current)
tedem [What is needed and is not included:]
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 ===== Overview ===== ===== Overview =====
  
-The WeatherDuino Air Quality Monitor II measure ​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 ​by using [[https://​en.wikipedia.org/​wiki/​NowCast_(air_quality_index)|Nowcast]] functions.\\ +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.\\ 
-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 also can work without WiFi connection, however ​several ​of their functionalities ​will be unavailable.\\ +The AQM II was designed to be installed in places with WiFi Coverage. It can also work without ​WiFi connection ​but several ​functions ​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.\\+ 
 +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}} 
  
-{{https://​www.meteocercal.info/​forum/​videos/​AQM_II.mp4}}\\ 
 ===== Key features ===== ===== 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 be used as a stand-alone device ​(doesn'​t require ​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).\\ - 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).\\ +- OLED display (Optional item. It is not necessary to install the OLED display, ​for example in a unit which is operating ​outdoors and sending ​data to WeatherDuino receiver).\\ 
-- Can upload Air Quality data to online services like Thinkspeak, or to your own server (ex: to store data on a database).\\ +- Can upload Air Quality data to online services like Thinkspeak, or to your own server (eg. to store data in 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.\\+- Several units can be used to form an 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.\\ - Powered via micro USB connector or connector on the PCB.\\
-- Software can be upgraded by Over the Air (OTA). Requires ​WiFi connection.\\+- Software can be upgraded by Over the Air (OTA) (requires ​WiFi connection).\\
 \\ \\
-Picture ​below shows what you get on an WeatherDuino receiverwhen the Air Quality Monitor II is setup to transmit data over radio frequency.\\+The picture ​below shows what you get on WeatherDuino receiver when the Air Quality Monitor II is setup to transmit data over radio frequency.\\
 \\ \\
-{{:​wiki:​screenshot_wd_02.png?​nolink&​400|}} +{{:​wiki:​screenshot_wd_02.png?​nolink&​400}}
-=====  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.\\+ 
 +===== What is needed and is not included: ===== 
 + 
 +- 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 Monitoruses an Plantower dust sensor (the model PMS5003which is older than the PMS7003 used on WeatherDuino AQM)\\ <​sup>​2)</​sup> ​  See [[:​weatherduino_receivers#​weatherduino_receivers_-_comparison_chart|systems compatibility here]]\\ +BaduraM.Batog, P., Drzeniecka-Osiadacz, Aand Modzel, P (2018Evaluation of Low-Cost Sensors for Ambient PM<​sub>​2.5</​sub> ​Monitoring. Journal of SensorsArticle ID 509654016 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 airis a very complicated tasknot achievable with simple equipmentAccording 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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