HC-SR04 Ultrasonic Distance Sensor Module 2cm–400cm for Arduino ESP32

HC-SR04 Ultrasonic Distance Sensor Module – 2cm to 400cm for Arduino & ESP32

The HC-SR04 Ultrasonic Distance Sensor is the most popular non-contact distance measurement module in the maker community. Using ultrasonic sound pulses, it accurately measures distances from 2cm to 400cm with a resolution of approximately 3mm — all with a simple 4-pin interface.

Key Specifications

• Operating Voltage: 5V DC
• Measuring Range: 2cm – 400cm
• Accuracy: ±3mm
• Measuring Angle: 15°
• Trigger Input: 10µs TTL pulse
• Echo Output: TTL pulse proportional to distance
• Operating Frequency: 40 kHz
• Connector: 4-pin (VCC, Trig, Echo, GND)

Compatibility & Use Cases

The HC-SR04 is directly compatible with Arduino, ESP32, NodeMCU, and Raspberry Pi via standard GPIO pins. Common applications include:

• Obstacle detection and avoidance in robotics
• Parking sensor and proximity alert systems
• Liquid level measurement in tanks
• People counter and occupancy detection for IoT
• STEM and educational distance measurement projects

Use the NewPing or HCSR04 Arduino library for clean, interrupt-driven distance readings without blocking delays.

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