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add notes about lora operation

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noerw 2017-09-24 14:15:20 +02:00
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lora-gps/README.md
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@ -15,6 +15,18 @@ It's based on
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](https://ttnmapper.org).
**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](https://docs.google.com/spreadsheets/d/1eL1nHxMidIcIdDE_l-DoY3kmE2e8b0YpOBW64WnYxj8)
to find a transmission interval that suits you.
## Sketch setup & opsensensemap integration
- Register a device under <https://console.thethingsnetwork.org>