FS90R continuous rotation 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, 4.8 to 6 V: use VIN
SIG	Input (the ESP32 drives it)	D25	Orange wire. 50 Hz PWM: 1.5 ms = stop, shorter or longer = speed and direction

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.

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

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

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