SG90 micro servo with ESP32

Supply 5 V Bus GPIO

Pins and ESP32 wiring

Pin	Role	ESP32 pin	Notes
GND	Ground	GND	Brown wire
VCC	Power	VIN	Red wire, 5 V: use VIN. Can reset the ESP32 if powered from USB alone under load
SIG	Input (the ESP32 drives it)	D25	Orange wire. 50 Hz PWM, 0.5 to 2.4 ms pulses

Suggested wiring for the 30-pin ESP32 DevKit, avoiding flash, input-only and strapping pins. BoardPilot checks it for you as you wire.

This module is sold for 5 V. Its outputs may be 5 V: use a level shifter or a voltage divider on ESP32 inputs.

A moving servo draws current peaks that can reset a USB-powered board. Power servos from a separate 5 V supply and connect the grounds. (Arduino Servo library reference, Servos draw considerable power; use a separate supply)

void setup() { pinMode(25, OUTPUT); }  // SIG

void loop() {
  digitalWrite(25, HIGH);
  delay(500);
  digitalWrite(25, LOW);
  delay(500);
}

Tower Pro SG90 datasheet, Wires: brown GND, red +5 V, orange PWM; 50 Hz, 1 to 2 ms

Part data: CC BY 4.0, free to reuse with credit to BoardPilot.