RuuviTags themselves measure once per 2.5 seconds. This measured data is broadcasted, and additionally RuuviTag stores one measurement per 5 seconds internally.
Ruuvi Gateway sends this data to Ruuvi Cloud once per minute, and the data is downsampled to once per 15 minutes after 24 hours.
So there are 4 possible data sources:
- RuuviTag broadcasts 2.5 seconds interval
- RuuviTag stores history data 5 minutes interval
- Ruuvi Cloud recent data (24 h) 1 minutes interval – Ruuvi Cloud old data 15 minutes interval
When a CSV export is done on the mobile application, all the data available to your device is included in export. This can cause different intervals in exported data.