Weird characters in serial monitor window

[laurynas...@gmail.com]

Hello,

I want to make calculations in code, which in result will be used for defining  position for stepper. But when I open serial monitor windows, there is always weird characters in first string. In second and further bottom strings numbers are correct (130.25). 

#include <AccelStepper.h>

// Define a stepper and the pins it will use

AccelStepper stepper1(AccelStepper::FULL4WIRE, A3,A1,A2,A0); // Defaults to AccelStepper::FULL4WIRE (4 pins) on 2, 3, 4, 5

AccelStepper stepper2(AccelStepper::FULL4WIRE, 0,2,1,3);

void setup()

{  

  // Change these to suit your stepper if you want

  stepper1.setMaxSpeed(2000);

  stepper2.setMaxSpeed(2000);

  Serial.begin(9600);

  

}

void loop()

{

  int a = 1000;

  int b = 2;

  float c = sqrt(a*a+b*b);

  Serial.println(c); 

  delay(200);  

   stepper1.moveTo(c);  // set target forward c steps

  stepper2.moveTo(c);  // set target forward c steps

  

  while (stepper1.distanceToGo() != 0 || stepper2.distanceToGo() != 0) 

  {

    stepper1.setSpeed(300);

    stepper2.setSpeed(300);   

    stepper1.runSpeedToPosition();

    stepper2.runSpeedToPosition(); 

  }

   

  }

When I try to run this code without accestepper library, like this:

void setup()

{  

  Serial.begin(9600);

  

}

void loop()

{

  int a = 1000;

  int b = 2;

  float c = sqrt(a*a+b*b);

  Serial.println(c); 

  delay(200);  

  }

then I got normal serial monitor data from beginning. How should code perform calculation to get the right value from beginning?

Thank you help, Laurynas

[Jan E]

hello.

Im having same problem.

As soon as i put in the blelow line in my program, the output to serial monitor doesnt work/show/shows less characters from a string printed with Serial.println instruction.

AccelStepper stepperX(1, sXpin_s, sXpin_d);

Im using big easy driver.

best regards

[Jan E]

...and my environment is Arduino mega 2560 with last version of accelstepper lib and windows 7.

thank you

[Po Lee]

Hey Laurynas,

Fair warning - I'm really a beginner at this, so take the following with a grain of salt.

I uploaded your sketch and it worked fine for me -130.25 from the very second I opened the serial monitor.  I'm using an easydriver, not the 4wire setup that you have, so I did change that.  However, I recently ran into another unrelated problem where I was getting strange output from my serial monitor.  After asking around, I was told to Serial.flush() and Serial.end() before the action and then Serial.begin() again afterwards.  In my case, I was putting the Arduino to sleep, and on wake up, the Serial monitor would output strange characters.  That cleared up the problem for me... Hopefully that helps!

[Jan E]

hi.

My problems was running out of (variable) memory :)

regards

kl. 16:16:11 UTC+2 tirsdag 23. april 2013 skrev Laurynas Valuzis følgende: