WePaRT

This project is based on the LiLyGO TTGO LoRa32 version 2.1_1.6 and is composed of two parts:

• A Base Station
• A Remote Station

Base Station

Think of this as a station that is placed where WiFi and/or Telephone is not accessible.
Is the one where sensors are attached. Actually those sensors are used:

• DHT22 (humidity, temperature)
• BME280 (pressure, temperature, humidity) Or BMP280 (pressure, temperature)
• SDS011 (particulate matter: PM10 and PM2.5)

Base station gets data from sensors and:

• Save them on a microSD card in CSV format
• propagate them through LoRa to the Remote Station
• act as an access point for showing real-time data on a webpage

Remote Station

Is the one attached to a WiFi infrastructure. Receives data from the Base Station and:

• transmits them to Thingspeak for graph generation
• transmits them over MQTT
• saves the good received data in a CSV, adding the current time/date taken from an NTP server
• saves the bad received data in a text file for further analisys of bad received packets
• shows a webpage by navigating to his IP address in the same wifi network were device is connected

Documents

• In the STL Folder are contained the STL parts to be 3D-printed.
• In the docs Folder are contained Datasheets and schematics.
• In the Arduino Folder are contained the programs to be uploaded on the Stations

Known Problems

• showing always some data, OLED's pixel burns out so will remain a "shadow". Solution (not yet implemented): a function like a screensaver
• if the connected SD broke up, the station wouldn't start-up since the connected SD can be detected but will fail other functions giving an unexpected behaviour that can lead to a continuos reset. Since the remote station can be placed in a place where is not visibile, if this happens, we will never see a failure: we will see the base station showing always the same data. Solution (not yet implemented): detect a timeout on the base station

Links

• You can read a full description of the WePaRT on the settorezero blog
• You can see actual data sent to Thingspeak by our WePaRT here
• This is the enclosure I've used for the Remote Station