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--- projects:internetofthings:pm10 [2019/07/09 15:07] – [sensori] scipio
+++ projects:internetofthings:pm10 [2020/06/01 22:04] (current) – [luftaden] scipio
@@ Line 7: / Line 7: @@
   * [[https://luftdaten.info/2018/04/25/integration-sensoren-fuer-laerm-und-no2/|rumore e biossido di azoto]]
   * [[https://luftdaten.info/feinstaubsensor-bauen/|kit PM10 con istruzioni]]
+  * [[https://sensor.community|sensor community]]
   * Particulate Matter App
     * [[https://play.google.com/store/apps/details?id=com.mrgames13.jimdo.feinstaubapp&hl=it|playstore]]
@@ Line 14: / Line 15: @@
 ===== opensensemap =====
-  * [[https://opensensemap.org/|home opensensmap]]
+  * [[https://opensensemap.org/|home opensensemap]]
   * [[https://docs.opensensemap.org/|API]]
 ===== sensori =====
-  * PM2.5 e PM10: [[https://it.aliexpress.com/item/32795231620.html|Nova SDS011]]
+  * PM2.5 e PM10: [[https://it.aliexpress.com/item/32795231620.html|Nova SDS011]] [[https://it.aliexpress.com/item/32724933436.html|Fyd SDS011]] [[https://www.zerozone.it/tecnologia-e-sicurezza/nova-pm-sds011-per-misurare-la-qualita-dellaria/13699|teoria]]
   * ozono:
     * [[http://myosuploads3.banggood.com/products/20190121/20190121013943mq131.pdf|MQ131]]: [[https://it.aliexpress.com/item/32792096137.htm|aliexpress 15€]]
-    * CJMCU-131 MQ131: [[https://it.aliexpress.com/i/32961496884.html|aliexpress 35€]]
+    * CJMCU-131 MQ131: [[https://it.aliexpress.com/i/32961496884.html|aliexpress 35€]] [[http://files.banggood.com/2018/01/SKU659809_CJMCU-131.pdf|schema]]
+  * temperatura e umidità:
+    * [[https://it.aliexpress.com/item/1872664976.html|TODO]]: i2c oppure one wire ?
+  * luminosità:
+    * [[https://it.aliexpress.com/item/32819359778.html|TODO]]: analogico o one wire ?
+  * pressione sonora: ???
+==== MQ131 ====
+[[https://github.com/ostaquet/Arduino-MQ131-driver/tree/master/datasheet|datasheet]] - [[https://github.com/ostaquet/Arduino-MQ131-driver|esempio utilizzo]] - [[http://wiring.org.co/learning/basics/airqualitymq135.html|wiring]]
+  * The MQ131 is a semiconductor gas sensor composed by a heater circuit and a sensor circuit.
+  * Heater consumes at least **150 mA**. So, don't connect it directly on a pin of the Arduino.
+  * Sensor MQ131 requires minimum **48h preheat** time before giving consistent results (also called "burn-in" time)
+  * There are two different MQ131; a black bakelite sensor for **low concentration** of ozone and a metal sensor for **high concentration** of ozone.
+  * This [[https://github.com/ostaquet/Arduino-MQ131-driver|driver]] is made to control the "naked" Winsen MQ131. The driver is able to pilot the low concentration version and the high concentration version.
+  * **To measure the air quality (e.g. pollution)**, it's better to use the low concentration MQ131 because the high concentration is not accurate enough for low concentration.

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