---
summary: Node firmware version and what changed; the humidity calibration and its review date
last_confirmed: 2026-02-23
review_after: 2026-03-01
---
# Node firmware

Version 2.1 on all nodes since 2026-02-23 (`sensor-node.md`). Why LoRa and not Wi-Fi: `decision-lora-vs-wifi.md`.

- Changed in 2.1: reading interval configurable, battery voltage sent with every reading.
- Calibration of the humidity offset is due again; see the review date above.