Firmware for GPS-tracked PM10 sensors on opensensemap.org
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README.md

lora-gps senseBox

This is a GPS tracked senseBox measuring particulate matter concentrations, transmitting its data via LoRaWAN through TheThingsNetwork to openSenseMap.

It’s based on

  • Arduino Mega (Arduino Uno should work to, just use SoftwareSerial for the SDS011)
  • Dragino LoRa- & GPS-Shield
  • SD-card reader (I used the one on the senseBox-Shield. Any other one should work as well, change the SD_PIN in config.h)
  • Novafit SDS011 particulate matter sensor
  • HDC1008 temp- & humidity sensor

For mobile power supply I used an Adafruit LiPo charger + 5.6Ah LiPo.

Notes about device operation

The device only measures and transmits once there was an initial GPS fix and a successful handshake with TheThingsNetwork. This means the device only begins operating when placed outdoors in areas with TTN coverage.

Important: TheThingsNetwork has a fair use policy, giving each device an uplink transmission time of 300 seconds per day. This means, that the rate at which you transmit depends on the duration you use the device per day. Each message payload has 24 bytes and is sent on a slow datarate SF10 (for higher range). You can use this calculator to find a transmission interval that suits you.

Sketch setup & opsensensemap integration

  • Register a device under https://console.thethingsnetwork.org
    • register a new application first
    • register a new device
    • note down the following values: Device ID, Application ID, Device EUI, App EUI, App Session Key
    • add the HTTP Integration to your application and point it to POST to https://ttn.opensensemap.org/v1.1 (no authentication headers are required)
  • Register a senseBox at https://opensensemap.org/register (or use the script register-osem.sh!)

    • select mobile for exposure
    • select the location where you plan the first deployment
    • select the model Luftdaten with SDS011 & DHT22
    • enable TheThingsNetwork Integration, and insert your Device ID and AppId, choose profile lora-serialization. Insert the following into Decode Options: json [{"decoder":"latLng"},{"decoder":"temperature","sensor_title":"Temperatur"},{"decoder":"humidity","sensor_title":"rel. Luftfeuchte"},{"decoder":"temperature","sensor_title":"PM2.5"},{"decoder":"temperature","sensor_title":"PM10"}]
  • Insert the EUIs & App Session Key you received from TTN in config.h

Hardware Setup

  • Flash the sketch using Arduino IDE
  • Stack the senseBox Shield onto the Arduino, then stack the Dragino shield on top.
  • Remove the GPS_TX and GPS_RX jumpers on the Dragino Shield, and wire these pins instead to the Arduinos RX2 and TX2 pins.
  • Wire the SDS011: RX & TX go to RX3 and TX3 on the Arduino, GND to GND, 5V to 5V ;)
  • Connect the LiPo to the LiPo-Charger, and connect the USB Output to the Arduino
  • Done!