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Fixt•© 2025
Updated: Jul 25, 2025—5 min read

Mini DIY ESPHome mmWave Presence Sensor ESP32 C3 + LD2450

Written by: Fixt

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TABLE OF CONTENTS
PrerequisitesEsp32 C3 mini + LD2450 Sensor CaseHow to wire it upESPHome FirmwareYAML FilesHow to use it on your dashboardPlotly GraphHow to create zonesHLKRadarToolESP32 C3 Case Housing (Antenna Fix)

Featured

Using DeepSeek R1 to Control Home AssistantUsing DeepSeek R1 to Control Home Assistant
Easiest way to Control your Smart Home with AI: Ollama + Home AssistantEasiest way to Control your Smart Home with AI: Ollama + Home Assistant

Related

Tags

Home-Assistant
ESPHome
Dashboard
Tutorial
Presence-Detection
Sensor

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mmWave Sensor
Side
Inside
Back

Prerequisites
#

Using the affiliate links below helps support the channel and all the content I create 🎉🙌
  • ESP32-C3 Development Board
    ESP32-C3 Board
    • Amazon: (3 pack)
    • Aliexpress:
      • TENSTAR
      • Win Win
Got Wi-Fi issues with your board?
The AliExpress and Amazon links on our site are for vendors whose versions of the board are reported by users to have
proper Wi-Fi antenna isolation
.
If you're still having trouble connecting after flashing, give the firmware with the Wi-Fi Fix a try!
  • LD2450 mmWave Radar Sensor
    LD2450 mmWave Radar Sensor
    • Amazon: (LD2450 Kit)
    • Aliexpress: (LD2450 Kit)
      • Option 1
      • Option 2
  • Dupont Cable
Dupont cable
  • Amazon: (Dupont Cable Female to Male (4 inch))
  • Aliexpress: (Dupont Cable Male to female (10 cm))

  • Termoretractil Heat shrink tube
Termoretractil Heat shrink tube
  • Amazon: (Heat Shrink Tube)
  • Aliexpress: (Heat Shrink Tube)
Optional
  • PCB Holder Arms:
    • Amazon: (Toolour Helping Hands Soldering)
    • Aliexpress: (Desk Clamp PCB Holder)
  • Soldering Station:
    • Amazon: (YIHUA 8786D 2 in 1)
    • Aliexpress: (JCD 8586D 2 IN 1)
  • USB C Cable
    • Amazon: (JSAUX USB C Cable [2-Pack 6.6ft])
    • Aliexpress: (USB C Cable)
  • 5v charger
    • Amazon: (2 Pack)
    • Aliexpress: (5v charger)

Esp32 C3 mini + LD2450 Sensor Case
#

By Alejandro Esteban Flores Muñoz
You can get it on:

How to wire it up
#

Wire Up
Wire Up
ESP32-C3 BoardLD2450
5v5v
21 (TX)RX
20 (RX)TX
GGND

ESPHome Firmware
#

YAML Files
#

How to use it on your dashboard
#

Plotly Graph
#

By dbuezas
Open your Home Assistant instance and open a repository inside the Home Assistant Community Store.
Use the configuration generator below to create a custom YAML configuration for your specific sensor name. Simply enter your sensor name and click "Generate YAML Configuration" to get the ready-to-use code that you can copy and paste directly into Home Assistant.
FirmwareSensor Name
With Bluetooth Proxymini_mmwave_sensor
Without Bluetooth Proxymini_mmwave_sensor_no

How to create zones
#

HLKRadarTool
#

ESP32 C3 Case Housing (Antenna Fix)
#

ESP32-C3 Case Housing
You can get it on:

Tags

Home-Assistant
ESPHome
Dashboard
Tutorial
Presence-Detection
Sensor
← Back to the blog

Featured

Using DeepSeek R1 to Control Home AssistantUsing DeepSeek R1 to Control Home Assistant
Easiest way to Control your Smart Home with AI: Ollama + Home AssistantEasiest way to Control your Smart Home with AI: Ollama + Home Assistant

Related

Tags

Home-Assistant
ESPHome
Dashboard
Tutorial
Presence-Detection
Sensor
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