Keywave KW307 24GHz RF Human Presence and Occupancy Sensor

The Keywave KW307 is a compact 24GHz RF-based human presence and occupancy sensor designed for accurately tracing moving and stationary humans in indoor and outdoor (when inside an approriate IP-rated enclosure) applications.

Built upon a custom-designed sensing SoC and proprietary mathematical signal algorithms, the KW307 delivers real-time spatial coordinates (±5 cm distance, ±3° angle) and multi-target tracking for up to 3 individuals with ultra-low power consumption. It combines radar signal processing, target detection, and human presence intelligence inside a compact module, allowing you to add reliable spatial sensing without developing complex radar mathematics from scratch.

The sensor provides real-time target location information, including distance and angle, allowing connected systems to respond more intelligently to where people are located. Its configurable sensing range, field of view and sensitivity make it suitable for home automation, lighting systems, HVAC control, appliances and other human-aware devices.

Its compact design, fast response and simple system integration help you develop smaller, cleaner and more intelligent projects - and the pre-soldered 2.54mm headers let you get started straight away using a breadboard for prototyping. Development resources are available on Github.

Is it mmWave?

No (but kind of yes as well!).

It's a 24GHz sensor, however mmWave is usually technically described as 30-300GHz, corresponding to wavelengths of 10mm down to 1mm. At 24 GHz, the wavelength is about 12.5 mm, so it falls just outside that definition.

However, in maker terms, this will be used in the same way - accurately detecting presence and occupancy - and the 24GHz radar is useful for home automation projects with up to 20m detection and a 100° FOV.

Key features

• 24GHz radar human-presence sensing
• Detects moving and stationary people
• Detection range up to 20 metres, depending on module configuration and environment
• Tracks up to four targets simultaneously
• Reports target distance and angle information
• Typical 100° field of view, configurable up to 120°
• Configurable range, sensitivity, gain and field of view
• Fast, real-time occupancy and location reporting
• Strong resistance to false triggers caused by fans, wind and vibration
• UART interface for connection to an external MCU

Videos

Specifications

Absolute Maximum Ratings

Characteristic	Symbol	Min	Typ	Max	Unit
5V supply voltage	VDD5V	-0.3	5.0	5.5	V
Digital I/O voltage	VDIO	-0.3	3.3	3.6	V
Digital I/O maximum current capability	IDIO,max			10	mA
Ambient Temperature	TA	-25		85	°C

*GPO cannot directly drive a high-current load; it requires a power MOS switch to do so
*It is recommended to add a 10µF decoupling capacitor to power input

DC Characteristics

Characteristic	Symbol	Min	Typ	Max	Unit
Supply voltage via 5V pin	VDD5V	3.6	5.0	5.5	V
Operation Current @ 20Hz update rate	IDC		4.0		mA
Operation Current @ 0.5Hz update rate	IDC		0.8		mA

RF Characteristics

Characteristic	Symbol	Min	Typ	Max	Unit
Operation frequency	FRF	24.05		24.25	GHz
RF output power	PRF		-2		dBm
Detection range	Range	0.1	10	20*	m
Field of View	FOV		100		degrees

*Horizontal alignment at 1m height
*For detection requirements up to 20 meters, please contact Keywave representative

Resources

• Github repository (includes full user guide PDF)
  
• Declaration of conformity (link coming soon)

Pinout

Pin	Symbol	Type	Description
P1	5V	Power	5V Power Supply Input (3.6V ~ 5.5V)
P2	GND	Power	Ground
P3	RX	Input	UART Receive Signal (3.3V Logic Level)
P4	TX	Output	UART Transmit Signal (3.3V Logic Level)
P5	GPO	Output	General Purpose Output. (Human Presence Flag output)
P6	ICLK	Input	Programming Clock Signal *Leave unconnected in typical applications
P7	IDAT	Input	Programming Data Signal *Leave unconnected in typical applications
P8	nRST	Input	Active-Low System Reset *Leave unconnected in typical applications

* Power Mode: Supply voltage is regulated by an on-chip LDO to power the internal core

Package Contents

• 1x Keywave KW307 24GHz Human Presence and Spatial Sensing Module