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ARDUINO

Arduino Ultrasonic Servo Wiring

This Arduino wiring schematic connects an HC-SR04 ultrasonic distance sensor and a small servo to an Arduino Uno. The Arduino sends a trigger pulse, measures the echo pulse, and uses that measurement to command the servo. A shared 5 V supply and ground are essential for the signal references to work. The capacitor provides local supply smoothing, but a servo can draw more current than an Arduino USB port should provide. For a moving mechanism, use a suitably rated external 5 V supply and keep its ground connected to the Arduino ground. Check the exact board pin labels in the accompanying sketch and keep sensor cables short where possible.

UPDATED 2026-09-24
TYPECircuit
EXAMPLEArduino Ultrasonic Servo Wiring
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CASE ANALYSIS

Scenario

Arduino distance-controlled servo

Key decisions

  • Supply: Give the board, sensor, and servo a common 5 V return.
  • Sensor pins: Connect trigger and echo to Arduino signal pins.
  • Actuator: Connect the servo control lead to a separate output pin.

When to reuse this

Use for a small Arduino distance-sensing project that moves a servo.

FAQ

Frequently asked questions

Why must grounds be shared?01
The sensor and servo signals need the same voltage reference as the Arduino to be read correctly.
Can the Arduino power a servo?02
A small unloaded servo may work temporarily, but an external regulated 5 V supply is safer for moving loads.
What does the HC-SR04 provide?03
It emits an ultrasonic pulse and returns an echo timing signal that the Arduino converts to distance.
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