SG90 servo with Arduino Uno R3

Wiring for the SG90 micro servo on the Arduino Uno R3 (ATmega328P, 5 V logic), chosen with the same pin rules BoardPilot uses: default buses first, and no pins that are used for flash, USB, the debugger or booting.

Wiring

SG90 servo pin	Role	Arduino Uno R3 pin	Notes
GND	Ground	GND	Brown wire
VCC	Power	5V
SIG	Input to the part	2 (PD2)	Orange wire. 50 Hz PWM, 0.5 to 2.4 ms pulses

Check before you power it on

Supply: 5 V from the 5V pin.
Motors, servos, relays and LED strips can draw more current than the Arduino Uno R3’s pins or USB can give. Power them separately and connect the grounds together.

Test code (Arduino)

// Library: Servo
#include <Servo.h>

Servo servo;

void setup() {
  servo.attach(2);
}

void loop() {
  servo.write(0);
  delay(1000);
  servo.write(90);
  delay(1000);
  servo.write(180);
  delay(1000);
}

Arduino board: arduino:avr:uno.

Questions

Which Arduino Uno R3 pins do I use for the SG90 servo?

GND → GND, VCC → 5V, SIG → 2 (PD2).

Does the SG90 servo work with the Arduino Uno R3 at 5 V?

Yes: the SG90 servo runs at 5 V and the Arduino Uno R3 uses 5 V signals, so no level shifting is needed.

BoardPilot checks this wiring in 3D as you build it, and finds crossed or missing wires on the real board.

Download BoardPilot

Full Arduino Uno R3 pinout · SG90 micro servo: all pins and data

The SG90 servo on other boards

ESP32 DevKit Arduino Mega 2560 R3 Arduino Nano WeAct Black Pill STM32F411CE ESP32-C3-DevKitM-1 ESP32-S3-DevKitC-1 Nordic nRF52840 DK NUCLEO-F401RE Raspberry Pi Pico 2 Raspberry Pi Pico W Raspberry Pi Pico Teensy 4.1

Other parts on the Arduino Uno R3

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