https://medium.com/jungletronics/ifr-520-mos-module-dorobot-4a3dd45ba2b7

_60_IFR520_01.ino

#define control 8                   // pin that controls the MOSFET

void setup() {
                                    // IRF520 MOSFET
  pinMode(control, OUTPUT);         // define control pin as output
  Serial.begin(9600);

}

void loop() {
                                    // IRF520 MOSFET

  digitalWrite(control, HIGH);      // turn the MOSFET Switch ON
  delay(2000);                      // Wait for 2000 ms or 2 second

  digitalWrite(control, LOW);       // Turn the MOSFET Switch OFF
  delay(2000);                      // Wait for 2000 ms or 2 second


}