Multicomp Pro HC-SR04 3V to 5V Ultrasonic Distance Sensor

The Multicomp Pro HC-SR04 Ultrasonic Distance Sensor is an advanced, low-voltage component engineered for seamless integration with modern microcontrollers. Specifically designed to operate from a 3V to 5.5V supply, it can connect directly to the 3.3V GPIO pins of popular platforms like the BBC micro:bit and Raspberry Pi without requiring level-shifting circuitry. This makes it an absolutely ideal choice for educational projects, robotics, and IoT applications where simplicity and direct compatibility are key.

It functions identically to the standard HC-SR04 sensor, utilising ultrasonic pulses to accurately measure distances. Users will note a slight reduction in maximum detection range when operating at the lower end of its voltage spectrum, a trade-off for the enhanced compatibility. A key mechanical difference is its forward-facing header pins, which protrude from the front of the PCB rather than the rear, offering alternative mounting and wiring options for tighter enclosures.

Key Features & Operation

• Low Power Consumption: Draws only 2mA operating current, making it suitable for battery-powered projects.
• Wide Sensing Range: Capable of detecting objects from 2cm up to 450cm (4.5m) with a resolution of 0.3cm.
• Focused Beam: Features a narrow 15° sensor angle for precise, directional measurement, reducing interference from surrounding objects.
• Simple Trigger-Echo Interface: Initiate a measurement by sending a 10µs HIGH pulse to the Trigger pin. The sensor then outputs an echo pulse on the Echo pin; the pulse width is directly proportional to the measured distance.

With its robust performance, versatile voltage range, and convenient form factor, this sensor is a reliable tool for creating obstacle avoidance systems, liquid level monitors, proximity alarms, and countless other interactive electronic projects.