DS3218 20 kg metal gear servo with ESP32

Supply 5-6.8 V Bus GPIO

Pins and ESP32 wiring

Pin	Role	ESP32 pin	Notes
GND	Ground	GND	Black or brown wire. Also connect to the ESP32 GND
VCC	Power	3V3	Red wire. 5 to 6.8 V from a separate supply rated 3 A or more, not the ESP32
SIG	Input (the ESP32 drives it)	D25	White or orange wire. 50 Hz PWM, 0.5 to 2.5 ms

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

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.