#include <Servo.h>

Servo ESC;  // create ESC object to control a servo
// twelve servo objects can be created on most boards

int PulseRate = 1200;    // variable to store the BLDC pulse rate.
void setup() {
  ESC.attach(PIN_PA3, 1000, 2000);  // attach Signal pin to pin 3, set minimum pulse width and maximyum pulse width in microseconds). 
}

void loop() {
  for (PulseRate = 1200; PulseRate <= 1800; PulseRate += 1) { // goes from a little over min to a little under max pulse rate. 
    // Make sure these pulse rates are compatible with all BLDC motors. 
    // in steps of 1 microsecond. (this is probably too slow)
    
    ESC.write(PulseRate);              // tell servo to go to position in variable 'pos'

    delay(1000);                       // waits 1s
  }
  for (PulseRate = 1800; PulseRate >= 1200; PulseRate -= 1) { // goes from 180 degrees to 0 degrees
    ESC.write(PulseRate);              // tell servo to go to position in variable 'pos'
    delay(1000);                       // waits 1 s
  }
}