Ultrasonic Sensor HC-SR04

HC-SR04 Ultrasonic Sensor Price in Pakistan

The HC-SR04 is a 5V ultrasonic distance-sensing module for Arduino-compatible controllers, robots and non-contact measurement projects. It sends an ultrasonic pulse and measures the returning echo time to estimate the distance to a target.

Connections

• VCC: 5V supply
• Trig: trigger input; the listing specifies a minimum 10µs pulse
• Echo: pulse-duration output used for the distance calculation
• GND: common ground

Key specifications

• Listed measurement range: approximately 2cm to 400cm
• Listed resolution: approximately 0.3cm
• Working current: approximately 15mA
• Quiescent current: less than 2mA
• Approximate dimensions: 45 × 20 × 15mm

Measurement guidance

Target shape, angle, distance and surface material can affect the returned echo. Soft or angled materials may produce weak reflections, so calibrate and test the sensor in its final mounting position. The Echo pin is a 5V logic signal; use suitable level shifting or a resistor divider with a 3.3V controller.

Common applications

• Robot obstacle detection
• Non-contact distance experiments
• Educational Arduino projects
• Prototype proximity alarms

For a compatible controller and mounting setup, see the Arduino UNO R3 with cable and the HC-SR04 sensor bracket.

Explore more distance and proximity sensors from Robonation Pakistan. For timing-code guidance, review the Arduino pulseIn reference.