HC-SR04 Ultrasonic Distance Sensor

HC-SR04 Non-Contact Ultrasonic Distance Sensor

The HC-SR04 sonar module provides non-contact distance measurement from 2 cm to 400 cm with stable readings unaffected by sunlight or target color. Sending an 8-cycle 40 kHz acoustic burst, it calculates distance based on echo travel time.

Specifications

• Measurement Range: 2 cm to 400 cm (0.8" to 157")
• Measurement Accuracy: 3 mm resolution
• Measuring Angle: 15 degrees effective cone
• Trigger Input: 10 μs TTL pulse
• Echo Output: TTL pulse proportional in duration to target distance
• Operating Voltage: 5.0V DC (Current: 15 mA active)