LD2450 Presense Radar ESP32-C3 Case Corner Mount

This is a compact enclosure for the LD2450 mmWave presence sensor combined with an ESP32-C3 Super Mini.
It is designed for corner mounting and optimized for small size.

With this setup, you can build a powerful Home Assistant presence sensor for around €8.

Features:

• Supports up to 3 detection zones natively (more possible via ESPHome configuration)
• Detects up to 3 people simultaneously
• Compact, clean design
• Optional corner mounting
• No external Bluetooth antenna required

Required materials:

- 3x M2x8 screws
- 1x M3x6 screw with flange or washer
- ESP32-C3 Super Mini
- LD2450 sensor + connection cable

Assembly:

To keep the enclosure as small as possible, wires are soldered directly to the ESP32 pads.

I bought the LD2450 as a set including a cable:

• The cable plugs directly into the LD2450
• The Dupont connectors were cut off

• The wires were soldered directly to the ESP32

  

1) ESP32

• Insert the ESP32 into the cover
• USB connector faces forward

• Secure with an M3×4–M3×8 screw with a flange or washer

  

2) LD2450

• Insert into the designated slot in the housing
• Connector faces forward
• Gold-colored antennas must point outward
• I recommend sticking some insulating tape on the back of the LD2450 to prevent short circuits with the screw holding the ESP32

3) Wiring

• Carefully stuff the cable into the housing
• Place the cover on top
• Secure with 2× M2×4–M2×10 screws

An external Bluetooth antenna is not required.
Even without it, Bluetooth configuration works reliably over several meters.

4) Corner Mounting (optional)

• 

• Print the wall-mount cover
• Secure the wall bracket with a nail or screw in the corner
• The mounting hole of the sensor must face downwards
• The sensor housing is then attached to the bracket using an M2×8–M2×10 screw

If you would like I can also design a bracket to attach the sensor parallel to the wall.

Feedback and criticism are welcome.

Changelog:

• 28/01/26: I added cooling holes on the back to keep the MCU Temperature lower (75°C vs 65°C). The changed part is still compatible with the other components.
• 13/02/26: I have removed the assumption that an ESP32-S3 could also fit. Since it has a thicker circuit board, another version of the case for the ESP32-S3 will be available soon.

If you like the project: