Ultrasonic Ranging Module HC-SR04

The HC-SR04 is an all-in-one ultrasonic ranging module providing accurate distance measurement from 2 cm to 3 m with a resolution of 1 mm. It operates on a 5 V supply and communicates via Trigger and Echo pins, making it compatible with most microcontrollers.

Specifications

• Supply voltage: 5 V DC
• Quiescent current: < 2 mA
• Detection angle: < 15°
• Ranging distance: 2 cm to 300 cm (optimized up to 4-5 m)
• Resolution: 1 mm
• Ultrasonic frequency: 40 kHz
• Interface: Trigger / Echo (standard digital GPIO)

This module is ideal for obstacle avoidance, leveling, or tank level measurement. It requires precise microsecond timing between the Trigger pulse and Echo readout.