← Greenhouse Sensors (demo) · myco-notes/entities/sensor-node.md · 1 KB · edited 2026-11-14 · raw

The battery LoRa nodes: hardware, power budget, where they send; read before changing a node or its batteries

Mentions state.md 1gateway.md 1runbook.md 1firmware.md 1greenhouse-a.md 1greenhouse-b.md 1
Mentioned by runbook.md 1state.md 1firmware.md 1gateway.md 1greenhouse-a.md 1greenhouse-b.md 1decision-lora-vs-wifi.md 1review-2026-03-15.md 1checks.md 1
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# Sensor node

Battery-powered node that measures air temperature, humidity and light every 5 minutes and sends them over LoRa.

- Hardware: ESP32 board, SHT41 sensor, 2 x AA lithium, IP65 box. Twelve nodes, inventory in `state.md`.
- Power budget: 38 uA asleep, 9 s awake per reading; measured life 14 months (bench test 2026-01-04).
- Sends to: `gateway.md`. Firmware: see the entity note for the firmware once it exists.
- How to replace batteries: `runbook.md`, "How do I swap a node's batteries?".

## Since 2026-03-04
- Firmware: `firmware.md`. Placement per house: `greenhouse-a.md`, `greenhouse-b.md`.