Calibration

Every room is different. Ceiling height, furniture and reflective surfaces affect the radar, and the spot on the ceiling affects the light reading. This page shows per sensor what you can adjust and how to make a good comparison.

The Mini has no climate sensors, so this page covers the radar and the light sensor only.

What You Can Adjust

Radar: LD2412 + LD2450

Tune the LD2412 first. Move on to the LD2450 zones once Presence behaves well.

Dynamic Background Correction

This teaches the LD2412 what the empty room looks like. Run it after installation and when presence stays on in an empty room.

1. Empty the room: no people, no pets.
2. Stop moving objects such as fans and curtains.
3. Open the device page in Home Assistant.
4. Press LD2412 Start Dynamic Background Correction. You find it under Diagnostic.
5. Leave the room and wait until LD2412 Dynamic Background Correction is off again.

Important: If someone is in the room during the correction, the radar can learn that person as background.

Presence Timeout

LD2412 Presence Timeout and LD2450 Presence Timeout set how many seconds presence stays on after the last detection. Raise the timeout if presence drops out while someone sits still. Lower it if the room should read as empty sooner.

Distance Gates

The LD2412 divides its range into gates. At the default resolution of 0.75 m, each gate covers about 0.75 m, counted from the sensor and not across the floor.

• LD2412 Maximum Distance Gate (2 to 13) is the furthest gate it uses. Lower it when the radar sees past the room, for example through a thin wall.
• LD2412 Minimum Distance Gate (1 to 12) is the closest gate it uses.
• LD2412 Distance Resolution changes the length of a gate: 0.2 m, 0.5 m or 0.75 m. A smaller value gives more precision but a shorter range.

The current firmware has no thresholds per gate.

LD2450 Zones

The LD2450 has 3 rectangular zones in the radar. Coordinates are in millimeters, with the sensor at zero.

1. Walk through the area you want and note LD2450 Target 1 X and LD2450 Target 1 Y at the corners.
2. Enter them in LD2450 Zone 1 X1, Y1, X2 and Y2.
3. Set LD2450 Zone Type:
   • Detection: the radar only reports targets inside the zones.
   • Filter: the radar ignores targets inside the zones.
   • Disabled: no zone filtering.
4. Check LD2450 Zone 1 Target Count while you walk in and out of the zone.

LD2450 Multi Target Tracking switches between tracking several people and one person.

Polygon zones in the Room Designer will follow with release firmware for this configuration.

Radar: LD2460 and LD6002B

Tuning options for these radars follow with their firmware builds, which are planned for release. The firmware will run both in top installation mode for ceiling mounting.

Light Sensor

Illuminance is the only light value of the light sensor. The firmware applies no correction for the housing, and there is no offset entity for light.

The sensor is on the ceiling, so it measures the light that reaches the ceiling and not the light on your desk. For automations, simply use the value the entity shows when the room is as bright as you want it.

Illuminance Full Spectrum, Lux Gain and Lux Integration Time are for diagnosis. You do not need them for automations.

How to Make a Good Comparison

• Turn the LED ring off, so its light does not play a part.
• Keep the light stable: no changing daylight and no lamps that just switched.
• Hold a lux meter just below the sensor, not at desk height.
• Compare at several light levels and over several readings, not a single value.

Good to Know

• Keep notes of the settings you changed.
• Check the calibration again after you move the sensor.
• Radar settings are stored in the radar module. LD2412 Factory Reset and LD2450 Factory Reset put them back to factory settings.

Related

• Sensor Definitions
• Radar and Sensor Modules
• Troubleshooting