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.
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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.
Frequently asked questions
Why must grounds be shared?
Can the Arduino power a servo?
What does the HC-SR04 provide?
More arduino examples
Try the diagram makers.
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