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# lora-gps senseBox
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This is a GPS tracked senseBox measuring particulate matter concentrations,
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transmitting its data via LoRaWAN through [TheThingsNetwork] to [openSenseMap].
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[TheThingsNetwork]: thethingsnetwork.org
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[openSenseMap]: opensensemap.org
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It's based on
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- Arduino Mega (Arduino Uno should work to, just use SoftwareSerial for the SDS011)
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- Dragino LoRa- & GPS-Shield
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- 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`)
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- Novafit SDS011 particulate matter sensor
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- HDC1008 temp- & humidity sensor
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For mobile power supply I used an Adafruit LiPo charger + 5.6Ah LiPo.
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## Notes about device operation
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The device only measures and transmits once there was an initial GPS fix and a
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successful handshake with TheThingsNetwork. This means the device only begins
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operating when placed outdoors in areas with [TTN coverage](https://ttnmapper.org).
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**Important**: TheThingsNetwork has a fair use policy, giving each device an
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uplink transmission time of 300 seconds per day. This means, that the rate at
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which you transmit depends on the duration you use the device per day.
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Each message payload has 24 bytes and is sent on a slow datarate SF10 (for higher range).
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You can use [this calculator](https://docs.google.com/spreadsheets/d/1eL1nHxMidIcIdDE_l-DoY3kmE2e8b0YpOBW64WnYxj8)
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to find a transmission interval that suits you.
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## Sketch setup & opsensensemap integration
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- Register a device under <https://console.thethingsnetwork.org>
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- register a new application first
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- register a new device
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- note down the following values: Device ID, Application ID, Device EUI, App EUI, App Session Key
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- add the HTTP Integration to your application and point it to POST to `https://ttn.opensensemap.org/v1.1`
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(no authentication headers are required)
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- Register a senseBox at <https://opensensemap.org/register> (or use the script `register-osem.sh`!)
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- select `mobile` for exposure
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- select the location where you plan the first deployment
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- select the model `Luftdaten with SDS011 & DHT22`
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- enable TheThingsNetwork Integration, and insert your Device ID and AppId, choose profile `lora-serialization`.
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Insert the following into Decode Options:
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```json
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[{"decoder":"latLng"},{"decoder":"temperature","sensor_title":"Temperatur"},{"decoder":"humidity","sensor_title":"rel. Luftfeuchte"},{"decoder":"temperature","sensor_title":"PM2.5"},{"decoder":"temperature","sensor_title":"PM10"}]
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```
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- Insert the EUIs & App Session Key you received from TTN in `config.h`
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## Hardware Setup
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- Flash the sketch using Arduino IDE
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- Stack the senseBox Shield onto the Arduino, then stack the Dragino shield on top.
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- Remove the `GPS_TX` and `GPS_RX` jumpers on the Dragino Shield, and wire these
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pins instead to the Arduinos `RX2` and `TX2` pins.
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- Wire the SDS011: RX & TX go to `RX3` and `TX3` on the Arduino, GND to GND, 5V to 5V ;)
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- Connect the LiPo to the LiPo-Charger, and connect the USB Output to the Arduino
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- Done!
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