Part: HC-SR04 Ultrasonic Sensor Module V2.0 — Handson Technology

Type: Ultrasonic Distance Sensor Module

Description: A low-cost ultrasonic sensor module operating from 3.3V to 5V DC, providing distance measurements from 2 cm to 400 cm with ±3mm accuracy, using a 40 KHz ultrasonic pulse.

Operating Conditions:

• Supply voltage: 3.3Vdc ~ 5Vdc
• Operating frequency: 40 KHz
• Operating range: 2 cm ~ 400 cm

Absolute Maximum Ratings:

• Max junction/storage temperature: null

Key Specs:

• Quiescent Current: <2mA
• Operating Current: 15mA
• Operating Range: 2cm ~ 400cm
• Accuracy: ±3mm
• Sensitivity: -65dB min
• Sound Pressure: 112dB
• Effective Angle: 15°

Features:

• Wider input voltage range (3.3Vdc ~ 5Vdc) compared to first generation
• Measures distance using sonar (40KHz ultrasonic pulse)
• On-board 2.54mm pitch pin header for easy prototyping
• Requires a 10uS TTL pulse to 'Trigger Input' pin to start ranging
• Provides TTL Logic Output on 'Echo' pin proportional to distance

Applications:

• Object avoidance in robotics projects
• Turret applications
• Water level sensing
• Car parking reverse sensors
• Liquid level detection

Package:

• 4-pins header with 2.54mm pitch (45mm x 20mm x 15mm)

HC-SR04 Ultrasonic Sensor Module – 4-Pin Header Pinout

Notes

• Pin order: Pins are arranged in a single row on a 2.54 mm pitch header connector.
• Operating voltage: Module supports both 3.3V and 5V logic levels (V2.0 variant).
• Trigger pulse: A 10 µS pulse on TRIG initiates an 8-cycle 40 kHz ultrasonic burst.
• Echo measurement: Pulse width on ECHO is proportional to distance. Use formula: distance (cm) = echo duration (µS) / 58.
• Measurement cycle: Recommended minimum 60 ms between successive measurements to avoid signal interference.