Can it detect someone who is sitting still?

Yes. It uses FMCW radar to sense micro-movements like breathing, so it detects stationary people that PIR sensors miss.

Does it work through walls or glass?

It can detect through thin plastic, glass, and drywall, but thick concrete or metal will block the signal. Range and sensitivity drop through dense materials.

What do I need to connect it to a microcontroller?

You need a 3.3V serial (UART) connection and a 5V power supply. A USB-to-serial adapter at 3.3V logic is recommended for configuration.

How is it different from the LD2410B?

The LD2410C adds a GPIO interface and has a slightly different antenna layout. Detection performance and serial protocol are essentially the same.

Can I adjust the detection range and sensitivity?

Yes. Range is adjustable from 0.75 m to 6 m, and sensitivity per distance gate can be tuned via serial commands or the manufacturer's app.

What is included in the package?

The package contains only the radar module. Cables, headers, and a power supply are not included.

Where is the LD2410C 24G Radar Human Presence Sensor cheapest?

At Walmart, for $9.43, as of our latest check.

Where can I buy the LD2410C 24G Radar Human Presence Sensor?

4 stores we checked sell it, including Walmart, Amazon, hi-link electronic, banggood.com.

Unbranded

LD2410C 24G Radar Human Presence Sensor

Best price now

$9.43at WalmartChecked 13 h ago

Compared across 2 stores. Prices are checked against each store and labelled with when.

Visit Walmart

Unbranded

LD2410C 24G Radar Human Presence Sensor

Best price now

$9.43at WalmartChecked 13 h ago

Compared across 2 stores. Prices are checked against each store and labelled with when.

Visit Walmart

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Price facts

Last seen at $9.43 at Walmart on Nov 10.
Checked at 2 stores.

Our take on the LD2410C 24G Radar Human Presence Sensor

The LD2410C is a 24GHz FMCW radar module that detects human presence, including stationary people, through plastic, glass, and thin walls. It outputs target distance and energy over a 3.3V serial port and also provides a simple high/low level signal. It suits DIY smart-home and lighting automation projects that need presence detection beyond what PIR sensors offer. Compared with the LD2410B, the C version adds a GPIO interface and a slightly different antenna layout, but the core detection performance is similar. Reviewers praise its ability to sense still occupants, though some find the default configuration and serial setup fiddly.

Best forDIY smart-home presence automationDetecting stationary people in a roomProjects needing distance output over serialHidden installation behind plastic or glass

Pros

Detects stationary and micro-motion presence, not just movement
Adjustable detection range from 0.75 m to 6 m
Serial output provides target distance and energy values
GPIO interface for simple high/low output
Wide ±60° detection angle
Works through plastic, glass, and thin walls

Cons

Requires configuration via serial or Bluetooth app; not plug-and-play
Can false-trigger from fans, curtains, or pets if sensitivity is not tuned
No onboard relay or mains switching; needs a microcontroller
Serial output level is 3.3V, not 5V tolerant
Documentation is sparse and partly translated

LD2410C 24G Radar Human Presence Sensor prices at every store

WalmartNew
In stockSold by Appliances storeReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.
$9.43Free shippingChecked 13 h ago
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AmazonNew
Availability unknown
As an Amazon Associate, Deal.ai earns from qualifying purchases.
$7.99+ $4.99 shippingChecked 13 h ago
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Also available at

hi-link electronicCheck price at hi-link electronic
banggood.comCheck price at banggood.com

LD2410C 24G Radar Human Presence Sensor price history

Lowest price we've seen: $2.46 on Nov 11 at hi-link electronic. Tracked across 3 stores since Nov 11.

What reviewers say

Reviewers and owners generally find the LD2410C reliable for detecting still presence, a clear step up from PIR for room automation. Many praise its range and distance reporting, but some criticise the setup process and occasional false triggers from moving objects.

What people mention

Presence detectionPraisedReviewers say it reliably detects people who are stationary, unlike PIR sensors.
SetupCriticisedOwners find the initial configuration and serial connection fiddly, especially without clear instructions.
False triggersCriticisedSome report false detection from moving fans, curtains, or pets until sensitivity is tuned down.
RangePraisedThe adjustable detection range up to 6 m is useful for covering medium-sized rooms.
Serial outputPraisedThe distance and energy data over serial is valued for advanced automation logic.

About the LD2410C 24G Radar Human Presence Sensor

Color: Blue material: Plastic+metal Frequency: 24G-24.25GHz Modulation method: FMCW Detection distance: 0.75~6m adjustable Detection angle: ±60° Power supply: 5V Current: ~79mA Output serial port level: 3.3V Sweep bandwidth: 250MHz Ambient temperature: -40℃~+85℃ Data format: Serial port ASCII output/high and low levels 3.3V& Package Contents: 1 x Sense Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.

Specifications

color: BlueSource
Viewing Angle: ±60°Source
Interface Type: GPIOSource
Nominal Current Rating: ~79mASource
Nominal Voltage: 5V

Questions and answers

Can it detect someone who is sitting still?: Yes. It uses FMCW radar to sense micro-movements like breathing, so it detects stationary people that PIR sensors miss.
Does it work through walls or glass?: It can detect through thin plastic, glass, and drywall, but thick concrete or metal will block the signal. Range and sensitivity drop through dense materials.
What do I need to connect it to a microcontroller?: You need a 3.3V serial (UART) connection and a 5V power supply. A USB-to-serial adapter at 3.3V logic is recommended for configuration.
How is it different from the LD2410B?: The LD2410C adds a GPIO interface and has a slightly different antenna layout. Detection performance and serial protocol are essentially the same.
Can I adjust the detection range and sensitivity?: Yes. Range is adjustable from 0.75 m to 6 m, and sensitivity per distance gate can be tuned via serial commands or the manufacturer's app.
What is included in the package?: The package contains only the radar module. Cables, headers, and a power supply are not included.
Where is the LD2410C 24G Radar Human Presence Sensor cheapest?: At Walmart, for $9.43, as of our latest check.
Where can I buy the LD2410C 24G Radar Human Presence Sensor?: 4 stores we checked sell it, including Walmart, Amazon, hi-link electronic, banggood.com.