A simple Arduino sketch that allows you to control a brushless motor via an ESC (or any servo really) using inputs from the Arduino IDE serial monitor.

servo_test.ino

#include <Servo.h> 

Servo esc;

int escPin = 9;
int minPulseRate = 1000;
int maxPulseRate = 2000;
int throttleChangeDelay = 100;

void setup() {
  
  Serial.begin(9600);
  Serial.setTimeout(500);
  
  // Attach the the servo to the correct pin and set the pulse range
  esc.attach(escPin, minPulseRate, maxPulseRate); 
  // Write a minimum value (most ESCs require this correct startup)
  esc.write(0);
  
}

void loop() {

  // Wait for some input
  if (Serial.available() > 0) {
    
    // Read the new throttle value
    int throttle = normalizeThrottle( Serial.parseInt() );
    
    // Print it out
    Serial.print("Setting throttle to: ");
    Serial.println(throttle);
    
    // Change throttle to the new value
    changeThrottle(throttle);
    
  }

}

void changeThrottle(int throttle) {
  
  // Read the current throttle value
  int currentThrottle = readThrottle();
  
  // Are we going up or down?
  int step = 1;
  if( throttle < currentThrottle )
    step = -1;
  
  // Slowly move to the new throttle value 
  while( currentThrottle != throttle ) {
    esc.write(currentThrottle + step);
    currentThrottle = readThrottle();
    delay(throttleChangeDelay);
  }
  
}

int readThrottle() {
  int throttle = esc.read();
  
  Serial.print("Current throttle is: ");
  Serial.println(throttle);
  
  return throttle;
}

// Ensure the throttle value is between 0 - 180
int normalizeThrottle(int value) {
  if( value < 0 )
    return 0;
  if( value > 180 )
    return 180;
  return value;
}

Genius.
Thank you :)

willROV , just replace Serial.ParseInt() by your value !

how to make it so it sends max 255 signal all the time when a button is pressed.

can you also help with the connection. also can you help me with an alternative power source and how to use them (preferably 9volt battery). thanks, any help is appreciated