#include <Servo.h>

Servo esc;  // create servo object to control the ESC

int escPin = 29;  // the pin where the ESC is connected

void setup() {
  esc.attach(escPin);  // attaches the ESC on pin 9 to the servo object
  esc.writeMicroseconds(1000);  // send minimum throttle signal (adjust as needed)
  delay(1000);  // wait for the ESC to initialize
}

void loop() {
  // Increase speed gradually
  for(int speed = 1000; speed <= 2000; speed += 10) {
    esc.writeMicroseconds(speed);  // send signal to ESC
    delay(20);  // wait for 20 milliseconds
  }
  
  // Hold max speed for a while
  esc.writeMicroseconds(2000);
  delay(2000);  // wait for 2 seconds
  
  // Decrease speed gradually
  for(int speed = 2000; speed >= 1000; speed -= 10) {
    esc.writeMicroseconds(speed);  // send signal to ESC
    delay(20);  // wait for 20 milliseconds
  }
  
  // Hold min speed for a while
  esc.writeMicroseconds(1000);
  delay(2000);  // wait for 2 seconds
}