SG90 servo with Raspberry Pi Pico

Wiring for the SG90 micro servo on the Raspberry Pi Pico (RP2040, 3.3 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	Raspberry Pi Pico pin	Notes
GND	Ground	GND	Brown wire
VCC	Power	VBUS
SIG	Input to the part	GP15	Orange wire. 50 Hz PWM, 0.5 to 2.4 ms pulses

Check before you power it on

Supply: 5 V from the VBUS pin.
Motors, servos, relays and LED strips can draw more current than the Raspberry Pi Pico’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(15);
}

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

Arduino board: rp2040:rp2040:rpipico. If the board is not found, hold the BOOTSEL button while plugging in the USB cable.

Questions

Which Raspberry Pi Pico pins do I use for the SG90 servo?

GND → GND, VCC → VBUS, SIG → GP15.

Does the SG90 servo work with the Raspberry Pi Pico at 3.3 V?

Yes: the SG90 servo runs at 5 V and the Raspberry Pi Pico uses 3.3 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 Raspberry Pi Pico pinout · SG90 micro servo: all pins and data

The SG90 servo on other boards

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