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Air Quality Monitoring Station
License
fu-hsi/AQMS
Folders and files
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|---|---|---|---|---|
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After a long time I decided to share my Personal Weather Station.
It is based on my PMS library (https://github.com/fu-hsi/PMS).
Configuration
Before uploading code, change configuration:
// Don't touch this ;-)// #define FU_PROFILE#ifdef FU_PROFILE#include"Settings.h"#else// Debug (D4)#defineDBG Serial1// Webservicestaticconstchar* WS_UA ="AQMS/2.0";staticconstchar* WS_TOKEN ="YOUR TOKEN";staticconstchar* WS_URL ="YOUR SERVER SCRIPT";// Wireless credentialsstaticconstchar* WL_SSID ="YOUR SSID";staticconstchar* WL_PASS ="YOUR PASSWORD";staticconstuint8_t WL_CHANNEL =0;// OTA credentialsstaticconstchar* BE_USERNAME ="admin";staticconstchar* BE_PASSWORD ="admin";// PMS configuration (INTERVAL & DELAY can't be equal!!!)staticconstuint32_t PMS_READ_INTERVAL =150000;staticconstuint32_t PMS_READ_DELAY =30000;// Takes N samples and counts the averagestaticconstuint8_t PMS_READ_SAMPLES =2;#endif// FU_PROFILE
Board settings
Board identification
If you have any problems, use flashInfo() function to identify board orCheckFlashConfig.ino (it's the same).This is very imporant for OTA update.
Circuit
I don't have necessary components for Fritzing, sorry...
| Component | WeMos | Note |
|---|---|---|
| Debug output | D4 | |
| Battery monitor | A1 | 100k resistor in series (max. 4.2V). |
| PMS7003 | TX => RX RX => TX VCC => 5V GND => GND | Disconnect before programming via a usb port! |
| SHT31-D | SDA => D1 SCL => D2 VCC => 3.3V GND => GND | For temperature and humidity (built-in heater). |
| BME280 | SDA => D1 SCL => D2 VCC => 3.3V GND => GND | For pressure and temperature (temperature and humidity as backup). |
Alternative sensors
I testet many sensors... The following list shows my ranking.
| Rank | Sensor | Note |
|---|---|---|
| 1 | SHT31-D | Temperature, Humidity (built-in heater, Filter Caps are also available). |
| 2 | BMP280 | Temperature, Pressure. |
| 3 | BMP180 | Temperature, Pressure. |
| 4 | BME280 | Temperature, Humidity, Pressure. |
| 5 | DHT22 (AM2302) | Temperature, Humidity. |
Don't use BME280 for measuring temperature... I get readings overstated more than 2°C.
DHT22 is also a bad choice for measuring humidity.
Best combo for me is SHT31-D with BMP280, but BMP280 stopped working properly before publishing this project and I use BME280 now.
- Radiation shield TFA 98.1114.02
- Wemos D1 ESP-WROOM-02
- Plantower PMS7003
- SHT31-D
- BME280
- Pollution
- Temperature and humidity
- Pressure
- Battery voltage
- OTA update over Wi-Fi
- Sending data to the server
- Mobility (Lithium-ion battery)
- Battery monitor
- File logging
Up to8 hours with listed conditions:
- Default configuration
- Li-Ion ~1500mAh
- Temperature ~3°C
In surface mounted S-BOX 116B IP65 (old hardware).
Merged with my previous meteorological station in the radiation shield.
Mounted on the balcony and powered through a thin cable connected to a PC USB.
USB socket in WeMos was removed (accidentally ;-).
Couple pictures from inside.
Table structure
CREATETABLE `weather_pms` (`id`int(10) unsignedNOT NULL AUTO_INCREMENT,`dt`timestampNOT NULL DEFAULTCURRENT_TIMESTAMP,`pm1`smallint(6) DEFAULTNULL,`pm25`smallint(6) DEFAULTNULL,`pm10`smallint(6) DEFAULTNULL,`rv`smallint(6) DEFAULTNULL,`v` float(4,2) DEFAULTNULL,`temperature` float(4,2) DEFAULTNULL,`humidity` float(4,2) DEFAULTNULL,`pressure` float(6,2) DEFAULTNULL,`bm280_temp` float(4,2) DEFAULTNULL,`bm280_hum` float(4,2) DEFAULTNULL,PRIMARY KEY (`id`)) ENGINE=InnoDB AUTO_INCREMENT=146810 DEFAULT CHARSET=utf8;
Sample data
id dt pm1 pm25 pm10 rv v temperature humidity pressure bm280_temp bm280_hum ------ ------------------- ------ ------ ------ ------ ------ ----------- -------- -------- ---------- -----------146810 2018-12-17 22:00:57 22 40 52 1024 4.20 -0.79 95.15 1008.28 -0.26 81.28146809 2018-12-17 21:57:57 26 44 66 1024 4.20 -0.72 94.94 1008.31 -0.17 80.95146808 2018-12-17 21:54:57 22 36 40 1024 4.20 -0.76 94.93 1008.31 -0.28 81.25146807 2018-12-17 21:51:57 18 34 43 1024 4.20 -0.79 95.20 1008.26 -0.17 81.19146806 2018-12-17 21:48:57 16 34 50 1024 4.20 -0.92 95.49 1008.25 -0.35 81.66146805 2018-12-17 21:45:57 22 40 52 1024 4.20 -0.93 95.45 1008.27 -0.41 81.77I have PHP script on my VPS server where I receive POST data.These data are then sent (after some calculations) to:
What calculations do I mean? For example:
- Reduced pressure
- Heat Index
- Dev Point
I also reject the results below a certain voltage.
For simplicity, I share only a basicws.php script. Rest is in your gesture.
<?phperror_reporting(0);ini_set('display_errors',0);date_default_timezone_set('Europe/Warsaw');// define('FU_PROFILE', true);if (defined('FU_PROFILE')) {require_once'config.php';}else {define('WS_TOKEN','YOUR TOKEN');define('DB_HOST','YOUR DB HOST');define('DB_USER','YOUR DB USER');define('DB_PASS','YOUR DB PASS');define('DB_NAME','YOUR DB NAME');}classDB{privatestatic$db =null;privatefunction__construct() {}publicstaticfunctiongetConnection() {if (self::$db ==null) {$dsn =sprintf('mysql:dbname=%s;host=%s',DB_NAME,DB_HOST);$options =array(PDO::MYSQL_ATTR_INIT_COMMAND =>"SET NAMES utf8",PDO::ATTR_ERRMODE =>PDO::ERRMODE_SILENT,PDO::ATTR_DEFAULT_FETCH_MODE =>PDO::FETCH_ASSOC, );self::$db =newPDO($dsn,DB_USER,DB_PASS,$options); }returnself::$db; }}if (!empty($_SERVER['HTTP_X_TOKEN']) &&$_SERVER['HTTP_X_TOKEN'] ==WS_TOKEN) {// Allowed fields$whiteList = ['pm1','pm25','pm10','rv','v','temperature','humidity','pressure','bm280_temp','bm280_hum' ];// Clear array$whiteList =array_fill_keys($whiteList,NULL);// Prepare array$storeData = [];$storeData =array_merge($storeData,$whiteList,array_intersect_key($_POST,$whiteList));try {$db =DB::getConnection();$stm =$db->prepare('INSERT INTO weather_pms SET dt = NOW(),' .implode(',',array_map(function ($key) {return$key .' = :' .$key; },array_keys($storeData))));$stm->execute($storeData); }catch(PDOException$e) {exit('DB error'); }}?>
- Add a GPS module for use in the field (https://github.com/fu-hsi/FuGPS).
UTC time from GPS is an extra bonus for work in offline mode.
