T218
24GHz Millimeter Wave Radar Module
Product Manual
November 20, 2025
Toplight Sensor Technology （Xiamen）Co., Ltd
All rights reserved. Infringement will be prosecuted.
I. Product Overview
The T218 module operates in the 24GHz frequency band. It emits millimeter-waves through
the onboard microstrip antenna and receives the echo signals reflected from the target. When an
object within the signal coverage area moves relative to the signal and the echo is detected, the
signal is first amplified by the high-gain intermediate-frequency amplifier inside the module.
Then, after the signal is collected and processed by the microcontroller, it is output via an I/O
level signal or UART protocol.
II. Application Fields
Smart sanitation
Intelligent lighting
Smart home systems
III. Feature Specifications
24GHz frequency band
FMCW (Frequency-Modulated Continuous Wave) mode
High-performance MMIC transceiver
Advanced 32-bit MCU
UART communication
The working voltage supports 5V DC/12V DC(PS1 POWER SUPPLY)
Capable of penetrating certain thicknesses of ceramics, glass, plastics, and other media without
requiring openings
Unaffected by temperature, humidity, noise, airflow, dust, or light, suitable for harsh
environments
IV. Product Parameters
Parameter
Typical Value
Unit
Operating Band/Frequency
24.035-24.225
GHz
Maximum e.i.r.p:
0.15
dBm
Motion Ranging Range
0.6~6
m
Motion Ranging Accuracy
±0.1
m
Antenna Beam Angle Range
-38°~ +40°
°
-15°~ +13°
°
Operating Voltage
(PS1 POWER SUPPLY)
5/12V DC
V
Operating Current
5V：45
12V：23
mA
Module power consumption
5V：0.23
12V：0.28
W
Dimensions
25.2*25.2
mm
Weight
2.0
g
Operating Temperature
-20~85
℃
Operating Humidity
<85% non-condensing
%
V. Antenna Angle Description
Product
Model
Antenna Beam Pattern
Module Placement
Diagram
Antenna Angle
Description
T218
Horizontal angle：
-38°~ +40°
Vertical angle：
-15°~ +13°
VI. Port Description
Number
Interface
Interface
Definition
Description
1
VCC
5V
2
GND
Ground
3
TX
UART Transmit
TTL
4
RX
UART Receive
TTL
5
GPIO
Level Signal
1
VCC
12V
2
GND
Ground
3
TX
UART Transmit
TTL
4
RX
UART Receive
TTL
5
GPIO
Level Signal
VII. Dimension Diagram
Module Dimension Diagram
⑤
④
③
②
①
⑤
④
③
②
①
Standard housing (ultrasonic) dimensional drawing
Standard Wiring Harness Specification
VIII. Finished Product Photo
IX. Function Description
Motion Target Detection: Range 0.6–6 m, detects target distance and reflected energy
Speed Detection: Measures target speed and direction
Micro-Motion Detection: Detects subtle movements within 4 m
Output Options: Supports UART serial communication, multiple protocols, and IO level output
Parameter Tuning: Adjustable via host software for various applications and environments
Firmware Updates: Supports convenient OTA upgrades
X. Precautions
1. There should be no metallic materials covering or blocking the antenna in front of
the radar module.
2. The radiation range of the radar is affected by the covering material and its
thickness. For the 24GHz millimeter-wave radar, according to experience, the
recommended thickness of plastic materials (such as ABS, PE, PVC, etc.) for the casing
is 3mm. When the thickness exceeds 3mm, the increase in loss should be taken into
account.
3. If you need to design the casing by yourself, try to maintain a distance of about
6mm between the casing and the antenna surface.
4. The farthest detection distance of the radar is related to the antenna and the
installation position. The farthest detection distance refers to the situation where an adult
is used as the detection target under the bare-board test conditions.
5. Specifications, technical parameters, and compatibility in this manual are subject to
change without notice due to technology updates, supply-chain adjustments, or regulatory
revisions. Please visit our website or contact your sales representative periodically for
the latest information. Thank you for your understanding and continued support as we
keep improving our products and services.
XI. FCC Warning
Any Changes or modifications not expressly approved by the party responsible for
compliance could void the user's authority to operate the equipment.
This device complies with part 15 of the FCC Rules. Operation is subject to the following two
conditions:
(1) This device may not cause harmful interference,
(2) this device must accept any interference received, including interference that may cause
undesired operation.
Note: This equipment has been tested and found to comply with the limits for a Class B digital device,
pursuant to part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a residential installation. This equipment generates,
uses and can radiate radio frequency energy and, if not installed and
used in accordance with the instructions, may cause harmful interference to radio communications.
However, there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause harmful interference to radio or television reception,
which can be determined by turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
—Reorient or relocate the receiving antenna.
—Increase the separation between the equipment and receiver.
—Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected.
—Consult the dealer or an experienced radio/TV technician for help.
XII. FCC Radiation Exposure Statement
This equipment should be installed and operated with minimum distance 20cm between the radiator
& your body. This transmitter must not be co-located or operating in conjunction with any other antenna or
transmitter.
