In this example, we use applications mentioned on our website, including:

• MQTT: an 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 topic 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 an 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 the UART-PlanTower PMS3003 wiring example.

RTL8722DM / RTL8722CSM:

RTL8722DM MINI:

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.

The time uses UTC format, and the PM2.5 data stores in s-d0. In the figure, s_d0 = 9 represents that the PM2.5 is 9, meaning that the entire publish/ subscribe process is working successfully.

Please visit the following websites for more details about the board & other examples:

• AmebaIoT Official Website: https://www.amebaiot.com/en/
• AmebaIoT Official FB Page: https://www.facebook.com/groups/AmebaIoT
• AmebaIoT Forum: https://forum.amebaiot.com/