Arduino Control of Electronic Speed Control (ESC)

Development Boards Arduino
3

i am friends with the same dilemma that you: Controls brusheless motor with arduino. I have some codes here that works with an engine speed ranging from 0 to 100% as this:

#include <Servo.h>

Servo myservo;

void arm(){
  // arm the speed controller, modify as necessary for your ESC  
  setSpeed(0);
  delay(1500); //delay 1 second,  some speed controllers may need longer
}

void setSpeed(int speed){
  // speed is from 0 to 100 where 0 is off and 100 is maximum speed
  //the following maps speed values of 0-100 to angles from 0-180,
  // some speed controllers may need different values, see the ESC instructions
  int angle = map(speed, 0, 100, 0, 180);
  myservo.write(angle);    
}

void setup()
{
  myservo.attach(2);
  arm();  
}


void loop()
{
  int speed;

  // sweep up from 0 to to maximum speed in 20 seconds
  for(speed = 0; speed <= 100; speed += 5) {
    setSpeed(speed);
    delay(1000);
  }
  // sweep back down to 0 speed.
  for(speed = 95; speed > 0; speed -= 5) {
    setSpeed(speed);
    delay(1000);
  }
  setSpeed(0);  
  delay(5000); // stop the motor for 5 seconds
}

but I want to control 4 brushless motors for my quadricoptero: I’m working on sketches:

int motorPin = 8;
int motor2Pin = 6;
int motor3Pin = 4;
int motor4Pin = 2;

#define MINCOMMAND 1000
#define MAXCOMMAND 1600
#define DIRCOMMAND 2000

void setup()  
{ 
  Serial.begin(9600);

  pinMode(motorPin , OUTPUT);
  pinMode(motor2Pin , OUTPUT);
  pinMode(motor3Pin , OUTPUT);
  pinMode(motor4Pin , OUTPUT); 
  arm();
} 


void arm()
{
  analogWrite(motorPin, MINCOMMAND / 8);
  analogWrite(motor2Pin, MINCOMMAND / 8);
  analogWrite(motor3Pin, MINCOMMAND / 8);
  analogWrite(motor4Pin, MINCOMMAND / 8);
}


void loop()  { 
  for(int MC = MINCOMMAND ; MC <= MAXCOMMAND; MC +=10) { 
    analogWrite(motorPin, MC / 8);  
    analogWrite(motor2Pin, MC / 8); 
    analogWrite(motor3Pin, MC / 8);
    analogWrite(motor4Pin, MC / 8); 

    delay(500);              
  } 



  int dir,a=10;


  Serial.println(" D para direita, E para esquerda F para frente e W para traseira ");

  if (Serial.available() >0) { //existem caracteres para ler

    dir=Serial.read();

    Serial.println(a);
    //altera a velocidade consoante o caracter. 
  }


  if (dir == 'a') 
  {
    for(int MC = MAXCOMMAND ; MC <= DIRCOMMAND ; MC +=10)
    { 
      analogWrite(motorPin, MC / 8);  
      Serial.println(dir);
    }
  }

  if (dir == 's') 
  {
    for(int MC = MAXCOMMAND ; MC <= DIRCOMMAND ; MC +=10)
    { 
      analogWrite(motor2Pin, MC / 8);
      Serial.println(dir);
    }
  }

  if (dir == 'w')
  {
    for(int MC = MAXCOMMAND ; MC <= DIRCOMMAND ; MC +=10)
    { 
      analogWrite(motor3Pin, MC / 8); 
      Serial.println(dir);
    }
  }

  if (dir == 'd') 
  {
    for(int MC = MAXCOMMAND ; MC <= DIRCOMMAND ; MC +=10)
    { 
      analogWrite(motor4Pin, MC / 8); 
      Serial.println(dir); 
    }
  }
}

it contains an error in the loop that still can not understand.