Controlling a servo

Projects Programming
1

Hi I am trying to control a servo using the for function. But my variable starts automatically at 1169 not at 1500 as I asked my program.

here's my code thank you!

#include <Servo.h>
Servo servo;


void setup()
{
  servo.attach(9);
  Serial.begin(9600);}


void loop()
{
servo.write(1500);
  delay(2000);

for(int x; x>=544; x-=25){
servo.write(x);//
    delay(200);
     Serial.print(" x= ");
      Serial.print(x);
     }
     Serial.print('\n');
     delay(3000);
 
}

Here, my servo starts at 1169.I tried to find out why. but I am unable to fix my problem.

for(int x; x>=544; x-=25){
servo.write(x);//

Thank you for your help!

2

You have not given x a value when declaring it as part of the for loop. The initial value of local variables when not given an initial value is undefined.

3

at the begining? if I assign a value for my x at the begining, it will only make the for once.

4

oh it's fine thx

#include <Servo.h>
Servo servo;


void setup()
{
  servo.attach(9);
  Serial.begin(9600); //imprimer les données recues - la fréquence
}


void loop()
{
servo.write(1500);
  delay(2000);

for(int x=1500; x>=544; x-=25){
servo.write(x);//120
    delay(200);
     Serial.print(" x= "); //imprimer les données sous...
      Serial.print(x);
     }
    
  Serial.print('\n');
     delay(3000);

}
5

Note that if you are using microsecond values, you need to use the below write format.

servo.writeMicroseconds(1500);