HC-SR04 Ultrasonic Sensor Specifications

General

• Sensor Type: Ultrasonic distance measurement
• Measurement Principle: Ultrasonic pulse echo
• Application: Distance measurement for robotics, obstacle detection, and automation projects

Electrical

• Operating Voltage: 5 V DC
• Operating Current: 15 mA (typical)
• Output Type: Digital pulse
• Trigger Input: 10 µs TTL pulse
• Echo Output: Pulse width proportional to distance

Performance

• Measuring Range: 2 cm – 400 cm
• Measuring Angle: ~15°
• Accuracy: ±3 mm
• Resolution: 0.3 cm
• Response Time: ~50 ms

Interface / Pins

• VCC – Power (+5V)
• Trig – Trigger input
• Echo – Echo output
• GND – Ground

Physical

• Dimensions: 45 mm × 20 mm × 15 mm
• Weight: ~10 g

Applications

• Obstacle detection for robots
• Object distance measurement
• Level sensing (water or liquid level)
• Arduino, Raspberry Pi, ESP32, or other microcontroller projects