Compare Temperature Across Devices in a Report

Visualize and compare temperature readings from multiple devices over the past 24 hours using a Line chart component in a report.

Preparation: Make sure the target devices are sending temperature telemetry to ThingsBoard (e.g. once per hour).

1. Navigate to Monitor ⇾ Reports ⇾ Templates.
2. Open an existing report template or create a new one.
3. Drag the Line chart component into the content area.

1. Set the Time window to last day, aggregated by 1 hour.
2. Set the Title to Temperature history.
3. Configure the Datasource — create a new entity alias:
   • Alias name: My devices
   • Filter type: Entity list
   • Type: Device
   • Entity list: add the devices whose temperature you want to compare.
4. Add a Series entry:
   • Key: temperature
   • Label: ${entityName} temperature
   • Units: °C
5. Configure the Y axis:
   • Label: Temperature
   • Min: 15, Max: 35
   • Units: °C
6. Configure the Legend:
   • Position: Bottom
   • Enable Min, Max, and Average display.
7. Click Save to save the component.

Update the file naming pattern to:

temperature-monitoring-report-%d{yyyy-MM-dd_HH:mm:ss}

Then click Save in the top-right corner.

Click Generate test report to verify the configuration. The resulting PDF contains a line chart with one series per device, each labelled with the device name, showing its temperature trend over the past 24 hours.