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@ -15,6 +15,18 @@ It's based on
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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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