Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Model Number	AJ-SR04M K
Sensor Type	Ultrasonic Ranging
Operating Voltage	5V DC
Detection Range	2cm - 450cm
Beam Angle	15 degrees
Interface Type	Square Wave Output
Waterproof Rating	IP67
Transducer Count	Dual-Head Integrated
Operating Temperature	-20°C to 70°C
Application	Reverse Parking Radar, Obstacle Avoidance

6 reviews

Anonymous

Mar 29, 2026

Rating: 5/5

Reliable in all weather

I installed this on my garden cart to avoid hitting walls. It has survived rain, snow, and direct sunlight without any issues. The IP67 rating is no joke. Great build quality.

Anonymous

Mar 15, 2026

Rating: 5/5

Perfect for my DIY parking sensor project

This dual-head module worked flawlessly with my Arduino setup. The waterproof casing is robust, and the square wave output is very stable even in rainy conditions. Highly recommended for automotive projects.

Anonymous

Mar 08, 2026

Rating: 5/5

Excellent value for money

Compared to other ultrasonic sensors I've bought, this integrated dual-head version saves so much wiring time. The signal is clean and consistent. Will be buying more for my robotics club.

Anonymous

Mar 08, 2026

Rating: 5/5

Great for obstacle avoidance robots

Using this on a small delivery robot prototype. The dual heads provide a wider coverage area than single sensors. Very happy with the precision and durability.

Anonymous

Mar 01, 2026

Rating: 4/5

Works as described

Solid performance for a parking radar application. The response time is quick enough for real-time feedback. Just make sure your microcontroller can handle the square wave frequency correctly.

Anonymous

Mar 01, 2026

Rating: 4/5

Good range, easy to integrate

The detection range is accurate up to about 4 meters which is plenty for reverse parking. Integration was straightforward using the provided pinout diagram. One star off because the mounting brackets are sold separately.

5 FAQ

Q: Can this module be directly connected to a 12V car battery?

A: No, the AJ-SR04M K operates at 5V DC. You must use a voltage regulator or step-down converter if connecting to a 12V automotive system to prevent damage.

Q: Is the output signal compatible with Raspberry Pi GPIO?

A: Yes, but since the Raspberry Pi GPIO is 3.3V logic and the sensor outputs 5V square waves, we recommend using a logic level converter to ensure safe operation.

Q: What is the exact distance between the two ultrasonic heads?

A: The center-to-center distance between the dual transducers is approximately 25mm, optimized for standard vehicle bumper installations.

Q: How do I clean the sensor if it gets muddy?

A: Due to its IP67 waterproof rating, you can simply rinse the sensor face with water or wipe it gently with a soft cloth. Avoid using harsh chemical solvents.

Q: Does this come with wiring harnesses included?

A: The package includes the sensor module and a short pigtail connector. Extended wiring harnesses are available separately in our accessories section.

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