HCSR04 Mounting Bracket

The dimensions vary slightly between manufacturers. For example, one blue acrylic version is specified as 68 × 56 × 3 mm, with a 16 mm sensor opening and 3.4 mm mounting holes, while another version is approximately 62 × 52 mm with 18 mm sensor openings and 3.8 mm mounting holes.

Main Features

1. Secure sensor mounting
The bracket holds the two ultrasonic transducers of the HC-SR04 in a fixed position, preventing unwanted movement during operation.

2. Proper ultrasonic alignment
The two circular openings allow the transmitter and receiver to face directly toward the target. Proper alignment helps maintain consistent distance measurements.

3. Lightweight construction
The acrylic/plastic construction makes the bracket suitable for small robot cars and portable Arduino projects without adding significant weight.

4. Easy installation
The bracket has mounting holes that can be used with screws, bolts, adhesive, or other mechanical fixing methods depending on the project design.

5. Suitable for robot cars
It is particularly useful for an obstacle-avoidance robot, where the HC-SR04 needs to be mounted at the front of the chassis.

Typical Dimensions

For the blue cartoon-style bracket shown in your picture, a commonly sold version has approximately:

• Thickness: 2.8–3.1 mm
• Ultrasonic sensor opening: 16 mm diameter
• Fixing holes: 3.8 mm diameter
• Material: Imported acrylic
• Weight: around 8 g

How It Is Used

The arrangement is essentially:

HC-SR04 Sensor → Insert into Bracket → Fix Bracket to Robot/Project Chassis

The bracket keeps the HC-SR04 facing forward, while the base can be attached to a robot chassis or other structure. The sensor’s VCC, Trig, Echo, and GND connections remain accessible for wiring to an Arduino or other microcontroller.

Important Note

This is a mechanical mounting accessory, not an electronic sensor. It does not perform distance measurement itself. The HC-SR04 module performs the ultrasonic measurement; the bracket only provides mechanical support, positioning, and alignment.