---
title: "temperature changed · RUAL Documentation"
description: "Starts the flow when a temperature reading changes. Set above or below to fire only when it crosses a threshold."
canonical: https://docs.rual.nl/block-types/globals/homeassist_trigger_temperature_changed
language: en
---

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Other

# temperature changed

This block is part of the [`globals`](https://docs.rual.nl/block-types/globals) group and was last modified in core [`v15.0.0`](https://docs.rual.nl/core-versions/150000).

Starts the flow when a temperature reading changes. Set above or below to fire only when it crosses a threshold.

- device `v15.0.0` `value` Only fire for this device. Leave empty for every device reporting temperature.

- room `v15.0.0` `value` Only fire for devices in this room. Leave empty for every room.

- above `v15.0.0` `number` Fire when the reading CROSSES above this °C. Fires once per crossing, not on every reading above it.

- below `v15.0.0` `number` Fire when the reading CROSSES below this °C. Fires once per crossing.

- flow `v15.0.0` `flow`

- device `v15.0.0` `object` The full device: id, name, room, type, capabilities, current state.

- device id `v15.0.0` `value` Stable platform id, e.g. zigbee:0x00158d0007e1a2b3.

- name `v15.0.0` `value` The device's friendly name.

- room `v15.0.0` `value` The room the device is assigned to, empty if none.

- type `v15.0.0` `value` sensor, light, switch, climate, cover, lock or button.

- capability `v15.0.0` `value` Which capability changed, e.g. occupancy, contact, power.

- value `v15.0.0` `value` The new value.

- previous `v15.0.0` `value` The value before this change, empty on the first report.

- at `v15.0.0` `number` Unix seconds the device reported.

Start-of-flow trigger on the temperature capability, in degrees Celsius. With neither threshold set it fires on EVERY changed reading, which for a sensor reporting every minute is a busy flow. With `above` or `below` set it fires on the CROSSING only : passing 25 fires once, not once per reading for the rest of the day.

| `zigbee` |
| --- |
| `zwave` |
| `matter` |
| `thermostat` |
| `climate` |
| `trigger` |

A typical wiring for [temperature changed](https://docs.rual.nl/block-types/globals/homeassist_trigger_temperature_changed): the `flow` out pin feeds [debug](https://docs.rual.nl/block-types/state%2520ui/state_debug).

[![Studio canvas example for the temperature changed block: typical wiring for temperature changed.](https://docs.rual.nl/canvas-examples/homeassist_trigger_temperature_changed.png)](https://docs.rual.nl/canvas-examples/homeassist_trigger_temperature_changed.png?v=3)

## Used in these guides

These documentation pages use or explain this block:

- [Trigger Reference](https://docs.rual.nl/home-automation/triggers)

## Version history

Introduced in [`v15.0.0`](https://docs.rual.nl/core-versions/150000).

- [Back to `globals`](https://docs.rual.nl/block-types/globals): Return to the main group to view all sub-groups

- [Back to `home`](https://docs.rual.nl/block-types/globals?group=home): Return to the group to view all blocks within this group

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