HC-SR04 ultrasonic ranging module connection guide

HC-SR04 ultrasonic ranging module Four-pin module header wiring guide with power, signal assignments, and bench checks.

Four-pin module header

4 contacts Current package

ELECFREAKS ·

Required

Use a host with 5 V-compatible inputs and outputs. Share ground and power the module from a regulated 5 V supply.

Set Trig low at idle. Send a pulse at least 10 µs long. Configure Echo as an input and impose a timer timeout so a missing echo cannot stall the host.
Point the module perpendicularly at a flat target 30 cm away. At about 343 m/s sound speed, the echo pulse should be about 1.75 ms.
Wait 60 ms between starts to keep later echoes from overlapping the next measurement.

ELECFREAKS HC-SR04 User Guide, §§ 2.3–2.5 and 3.1.

Highlighted contacts are used in the required step or selected circuit. Select a contact to inspect it.

Four-pin module header

Face the two transducers with the connector below them. VCC, Trig, Echo, and GND run left to right.

Supply input · Power

Primary device supply. Place the bypass capacitor close to this pin.

ELECFREAKS HC-SR04 User Guide, §§ 2.3–2.5 and 3.1.

This map follows the 5 V ELECFREAKS HC-SR04. Check the markings and voltage limits on lookalike modules.

HC-SR04 manufacturer documentation· ELECFREAKS HC-SR04 User Guide, §§ 2.3–2.5 and 3.1.