



Prerequisites#
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- ESP32 30 PIN Development Board
- Amazon: (3 pack)
- Aliexpress: (USB C / Micro USB)
- HLK-LD2450 mmWave Radar Sensor
- Amazon: (HLK-LD2450 Kit)
- Aliexpress: (HLK-LD2450 Kit)
Optional
- Dupont Cable
- Amazon: (Dupont Cable Female to female)
- Aliexpress: (Dupont Cable Female to female)
- USB C Cable
- Amazon: (2 Pack)
- Aliexpress: (USB C Cable)
- 5v charger
- Amazon: (2 Pack)
- Aliexpress: (5v charger)
HLK-LD2450 Sensor Specs#

- Frequency: 24 GHz (ISM band)
- Sensor Type: Millimeter wave radar
- Detection Range: Up to 6 meters (approximately 8 meters in practical terms)
- Module Size: Ultra-small, measuring 15mm x 44mm
- Detection Angle: ±60°
- Pitch Angle: ±35°
Additionally, the HLK-LD2450 sensor supports the following features:
- Precise motion target localization and tracking: Distance, angle and speed.
- Configurable Zones: It allows you to define up to 3 configurable zones for monitoring.
- Multiple Connection Options: You can connect it using pin and socket interfaces.
- Intelligent Algorithm Firmware: Utilizes FMCW waveforms and advanced signal processing technology.
fixtSE DIY Sensor Case#
I'll keep adding more sensors to this case, so you can use it for other projects as well.
You can get it on:
Or order it from:
Save $5 on your first order using our link: https://pcbway.com/g/lHR6if
How to wire it up#

ESP32 Board | HLK-LD2450 |
---|---|
VIN | 5v |
TX2 | RX |
RX2 | TX |
GND | GND |
ESPHome Firmware#
Updated firmware to ESPHome 2024.12.4
Added OTA support
The only difference between the two firmwares is the Bluetooth Proxy. If you don't need it, you can use the firmware without it.
You can find the documentation here
YAML Files#
v1.2.0:
Added OTA support (deactivated by default)

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How to create zones#
HLKRadarTool#
How to use it on your dashboard#
Plotly Graph#
By dbuezas
Just replace mmwave_sensor
with your sensor's name. Ej: mmwave_sensor_aac3
or mmwave_sensor_no_aac3
based on the firmware you flashed.
Firmware | Sensor Name |
---|---|
With Bluetooth Proxy | mmwave_sensor |
Without Bluetooth Proxy | mmwave_sensor_no |
Custom Card
type: custom:plotly-graph
title: mmWave Radar Sensor
refresh_interval: 1
hours_to_show: current_day
layout:
height: 230
margin:
l: 50
r: 20
t: 20
b: 40
showlegend: true
xaxis:
dtick: 100
gridcolor: RGBA(200,200,200,0.15)
zerolinecolor: RGBA(200,200,200,0.15)
type: number
fixedrange: true
range:
- 400
- -400
yaxis:
dtick: 100
gridcolor: RGBA(200,200,200,0.15)
zerolinecolor: RGBA(200,200,200,0.15)
scaleanchor: x
scaleratio: 1
fixedrange: true
range:
- 600
- 0
entities:
- entity: ''
name: Target1
marker:
size: 12
line:
shape: spline
width: 5
x:
- $ex hass.states["sensor.mmwave_sensor_target_1_x"].state /-10
'y':
- $ex hass.states["sensor.mmwave_sensor_target_1_y"].state /10
- entity: ''
name: Target2
marker:
size: 12
line:
shape: spline
width: 5
x:
- $ex hass.states["sensor.mmwave_sensor_target_2_x"].state /-10
'y':
- $ex hass.states["sensor.mmwave_sensor_target_2_y"].state /10
- entity: ''
name: Target3
marker:
size: 12
line:
shape: spline
width: 5
x:
- $ex hass.states["sensor.mmwave_sensor_target_3_x"].state /-10
'y':
- $ex hass.states["sensor.mmwave_sensor_target_3_y"].state /10
- entity: ''
name: Zone1
mode: lines
fill: toself
fillcolor: RGBA(20,200,0,0.1)
line:
color: RGBA(20,200,0,0.2)
shape: line
width: 2
x:
- $ex hass.states["number.mmwave_sensor_zone_1_x1"].state /-10
- $ex hass.states["number.mmwave_sensor_zone_1_x1"].state /-10
- $ex hass.states["number.mmwave_sensor_zone_1_x2"].state /-10
- $ex hass.states["number.mmwave_sensor_zone_1_x2"].state /-10
- $ex hass.states["number.mmwave_sensor_zone_1_x1"].state /-10
'y':
- $ex hass.states["number.mmwave_sensor_zone_1_y1"].state /10
- $ex hass.states["number.mmwave_sensor_zone_1_y2"].state /10
- $ex hass.states["number.mmwave_sensor_zone_1_y2"].state /10
- $ex hass.states["number.mmwave_sensor_zone_1_y1"].state /10
- $ex hass.states["number.mmwave_sensor_zone_1_y1"].state /10
- entity: ''
name: Zone2
mode: lines
fill: toself
fillcolor: RGBA(200,0,255,0.1)
line:
color: RGBA(200,0,255,0.2)
shape: line
width: 2
x:
- $ex hass.states["number.mmwave_sensor_zone_2_x1"].state /-10
- $ex hass.states["number.mmwave_sensor_zone_2_x1"].state /-10
- $ex hass.states["number.mmwave_sensor_zone_2_x2"].state /-10
- $ex hass.states["number.mmwave_sensor_zone_2_x2"].state /-10
- $ex hass.states["number.mmwave_sensor_zone_2_x1"].state /-10
'y':
- $ex hass.states["number.mmwave_sensor_zone_2_y1"].state /10
- $ex hass.states["number.mmwave_sensor_zone_2_y2"].state /10
- $ex hass.states["number.mmwave_sensor_zone_2_y2"].state /10
- $ex hass.states["number.mmwave_sensor_zone_2_y1"].state /10
- $ex hass.states["number.mmwave_sensor_zone_2_y1"].state /10
- entity: ''
name: Zone3
mode: lines
fill: toself
fillcolor: RGBA(200,120,55,0.1)
line:
color: RGBA(200,120,55,0.2)
shape: line
width: 2
x:
- $ex hass.states["number.mmwave_sensor_zone_3_x1"].state /-10
- $ex hass.states["number.mmwave_sensor_zone_3_x1"].state /-10
- $ex hass.states["number.mmwave_sensor_zone_3_x2"].state /-10
- $ex hass.states["number.mmwave_sensor_zone_3_x2"].state /-10
- $ex hass.states["number.mmwave_sensor_zone_3_x1"].state /-10
'y':
- $ex hass.states["number.mmwave_sensor_zone_3_y1"].state /10
- $ex hass.states["number.mmwave_sensor_zone_3_y2"].state /10
- $ex hass.states["number.mmwave_sensor_zone_3_y2"].state /10
- $ex hass.states["number.mmwave_sensor_zone_3_y1"].state /10
- $ex hass.states["number.mmwave_sensor_zone_3_y1"].state /10
- entity: ''
name: Coverage
mode: lines
fill: tonexty
fillcolor: rgba(168, 216, 234, 0.15)
line:
shape: line
width: 1
dash: dot
x:
- 0
- $ex 600 * Math.sin((2 * Math.PI)/360 * 60)
- 450
- 400
- 300
- 200
- 100
- 0
- -100
- -200
- -300
- -400
- -450
- $ex -600 * Math.sin((2 * Math.PI)/360 * 60)
- 0
'y':
- 0
- $ex 600 * Math.cos((2 * Math.PI)/360 * 60)
- $ex Math.sqrt( 600**2 - 450**2 )
- $ex Math.sqrt( 600**2 - 400**2 )
- $ex Math.sqrt( 600**2 - 300**2 )
- $ex Math.sqrt( 600**2 - 200**2 )
- $ex Math.sqrt( 600**2 - 100**2 )
- 600
- $ex Math.sqrt( 600**2 - 100**2 )
- $ex Math.sqrt( 600**2 - 200**2 )
- $ex Math.sqrt( 600**2 - 300**2 )
- $ex Math.sqrt( 600**2 - 400**2 )
- $ex Math.sqrt( 600**2 - 450**2 )
- $ex 600 * Math.cos((2 * Math.PI)/360 * 60)
- 0
raw_plotly_config: true
How to automate with it#
💡𐂷 Sensor Light