From f6abbf0510425bc578d276dfca5bdf709b714be5 Mon Sep 17 00:00:00 2001 From: noerw Date: Sun, 24 Sep 2017 14:15:20 +0200 Subject: [PATCH] add notes about lora operation --- lora-gps/README.md | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/lora-gps/README.md b/lora-gps/README.md index df8d243..fc0faa9 100644 --- a/lora-gps/README.md +++ b/lora-gps/README.md @@ -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