MQTT - Upload PM2.5 Data to LASS System
Intro to LASS
The LASS stands for “Location Aware Sensor System”. It is an open
project and was started only for the interest of public welfare. Find
detailed
introduction here.
Practically, LASS is based on MQTT protocol to collect all kinds of
uploaded data, and for those who need these data can subscribe top as
well.
Find more LASS information at their official hackpad.
Preparation
AmebaD [AMB21 / AMB22 / AMB23 / BW16] x 1
PlanTower PMS3003 or PMS5003 x1
Example
In this example, we use applications mentioned at our website, including:
MQTT: a MQTT-Broker to connect to LASS. The Client is “FT1_0XXXX”, the XXXX are the four last digits of Ameba’s Wi-Fi MAC, and the outTopic is “LASS/Test/Pm25Ameba/clientID“, where clientID is the actual Ameba’s MQTT client ID.
NTP: uploaded data must have time notation
PM2.5: uploaded data includes PM2.5 information
Open the example.
“File” -> “Examples” -> “AmebaMQTTClient” ->
“lass_basic”
This example requires internet connection, so make sure you fill in SSID
and PASS into AP information that you wish to connect.
Also, LASS requires GPS information. There is no GPS sensor
included in this example, so you must manually provide GPS information.
Use Google Map to find the coordinates you plan to place your Ameba. You
can see in this example that the latitude is 24.7814033, and the
longitude is 120.9933676
Fill in GPS info at
gps_lat
and gps_lon
.Then connect sensors according to UART-PlanTower PMS3003 wiring example.
AMB21 / AMB22:
AMB23:
BW16:
Compile the code and upload it to Ameba. After pressing the Reset button,
Ameba will attempt to read PM2.5 data every minute and upload it to LASS
MQTT-Broker. Open Serial Monitor to see the uploaded data, including client
id, topic, and current PM2.5 status.
We can also use MQTTlens to verify if the data is properly uploaded.
Enter “gpssensor.ddns.net” as the MQTT-Broker server and “LASS/Test/PM25/live”
as the subscribe topic to receive data.