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content/notes/07-location-sensors.md
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@ -199,7 +199,8 @@ Fingerprinting services using Wifi
- Notification possible to avoid polling
- Bidirectional communication
- Not primarily focus, mostly for setting parameters
> [!INFO] beacons send out theur UUID periodically, does not use much battery, low bandwith
> sensors send out some data with the UUID
- Location and Proximity Sensing using Bluetooth LE
- One beacon (e.g. per room)
@ -209,8 +210,8 @@ Fingerprinting services using Wifi
- Range calculation using Received Signal Strength Indicator (RSSI) and calibrated transmitter power (txPower = RSSI at 1m)
- Trilateration using several beacons but not very accurate
- Range different for beacons but typically between 20-50m (rarely 100m)
![](https://i.imgur.com/Xqh7cp0.png)
> [!INFO] can locate things using similar techniques to cell towers
- Different protocols on top of Bluetooth LE

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content/notes/info-305.md
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@ -21,6 +21,6 @@ tags:
- [x] [[04-lens-studio]]
- [x] [[05-pervasive-ubiquitious-2]]
- [x] [[06-challenges-for-ubicomp-and-intro-to-sensors]]
- [ ] [[07-location-sensors]]
- [x] [[07-location-sensors]]
# Info