DVD Stepper controlled tape burning laser

May 17, 2012, 1:03 pm

I’ve combined the laser and the DVD stepper. To control the motion of the laser while burning a piece of tape. It’s basically a proof of concept to see if this is worth doing on an XY stage (made of DVD parts).

It works pretty well! I left the laser etching away at the tape for 5mins and it cut a pretty regular line in the tape. There’s still quite a lot to play around with, but getting there.

Video:

const int motorPin1 =11;
const int motorPin2 =10;
const int motorPin3 =9;
const int motorPin4 =8;
 
void setup() {
  // initialize the digital pin as an output.
  // Pin 13 has an LED connected on most Arduino boards:
  pinMode(motorPin1, OUTPUT);
  pinMode(motorPin2, OUTPUT);
  pinMode(motorPin3, OUTPUT);
  pinMode(motorPin4, OUTPUT);
}
 
void loop() {
 // HALF STEP
  int motorDelay=50; 
  for(int n=0;n<60;n++) {

  digitalWrite(motorPin1, HIGH);
  digitalWrite(motorPin2, LOW);
  digitalWrite(motorPin3, HIGH);
  digitalWrite(motorPin4, LOW);
  delay(motorDelay);
 
  digitalWrite(motorPin1, HIGH);
  digitalWrite(motorPin2, LOW);
  digitalWrite(motorPin3, HIGH);
  digitalWrite(motorPin4, HIGH);
  delay(motorDelay);  
 
  digitalWrite(motorPin1, HIGH);
  digitalWrite(motorPin2, LOW);
  digitalWrite(motorPin3, LOW);
  digitalWrite(motorPin4, HIGH);
  delay(motorDelay);  
 
  digitalWrite(motorPin1, HIGH);
  digitalWrite(motorPin2, HIGH);
  digitalWrite(motorPin3, LOW);
  digitalWrite(motorPin4, HIGH);
  delay(motorDelay); 
 
  digitalWrite(motorPin1, LOW);
  digitalWrite(motorPin2, HIGH);
  digitalWrite(motorPin3, LOW);
  digitalWrite(motorPin4, HIGH);
  delay(motorDelay); 
 
  digitalWrite(motorPin1, LOW);
  digitalWrite(motorPin2, HIGH);
  digitalWrite(motorPin3, HIGH);
  digitalWrite(motorPin4, HIGH);
  delay(motorDelay); 
 
  digitalWrite(motorPin1, LOW);
  digitalWrite(motorPin2, HIGH);
  digitalWrite(motorPin3, HIGH);
  digitalWrite(motorPin4, LOW);
  delay(motorDelay); 
 
  digitalWrite(motorPin1, HIGH);
  digitalWrite(motorPin2, HIGH);
  digitalWrite(motorPin3, HIGH);
  digitalWrite(motorPin4, LOW);
  delay(motorDelay);
  }
  
  for(int n=0;n<60;n++) {
    digitalWrite(motorPin1, HIGH);
  digitalWrite(motorPin2, HIGH);
  digitalWrite(motorPin3, HIGH);
  digitalWrite(motorPin4, LOW);
  delay(motorDelay); 
 
  digitalWrite(motorPin1, LOW);
  digitalWrite(motorPin2, HIGH);
  digitalWrite(motorPin3, HIGH);
  digitalWrite(motorPin4, LOW);
  delay(motorDelay);  
 
  digitalWrite(motorPin1, LOW);
  digitalWrite(motorPin2, HIGH);
  digitalWrite(motorPin3, HIGH);
  digitalWrite(motorPin4, HIGH);
  delay(motorDelay);  
 
  digitalWrite(motorPin1, LOW);
  digitalWrite(motorPin2, HIGH);
  digitalWrite(motorPin3, LOW);
  digitalWrite(motorPin4, HIGH);
  delay(motorDelay); 
 
  digitalWrite(motorPin1, HIGH);
  digitalWrite(motorPin2, HIGH);
  digitalWrite(motorPin3, LOW);
  digitalWrite(motorPin4, HIGH);
  delay(motorDelay); 
 
  digitalWrite(motorPin1, HIGH);
  digitalWrite(motorPin2, LOW);
  digitalWrite(motorPin3, LOW);
  digitalWrite(motorPin4, HIGH);
  delay(motorDelay); 
 
  digitalWrite(motorPin1, HIGH);
  digitalWrite(motorPin2, LOW);
  digitalWrite(motorPin3, HIGH);
  digitalWrite(motorPin4, HIGH);
  delay(motorDelay); 
 
  digitalWrite(motorPin1, HIGH);
  digitalWrite(motorPin2, LOW);
  digitalWrite(motorPin3, HIGH);
  digitalWrite(motorPin4, LOW);
  delay(motorDelay);
  }     
}
Category: Uncategorized  |  Comment

DVD drive stepper motor, ULN2003 driver and Arduino

May 17, 2012, 6:33 am

Playing with a DVD drive stepper and an Arduino today. I mostly used the information from here

I omitted the Zener, from the circuit shown. And I’m driving stepper with a cut down version of his code:


const int motorPin1 =8;
const int motorPin2 =9;
const int motorPin3 =10;
const int motorPin4 =11;


void setup() {                
  // initialize the digital pin as an output.
  // Pin 13 has an LED connected on most Arduino boards:
  pinMode(motorPin1, OUTPUT);    
  pinMode(motorPin2, OUTPUT);    
  pinMode(motorPin3, OUTPUT);    
  pinMode(motorPin4, OUTPUT);     
}

void loop() {
 // HALF STEP  
 int motorDelay=10;
  digitalWrite(motorPin1, HIGH);
  digitalWrite(motorPin2, LOW);
  digitalWrite(motorPin3, HIGH);
  digitalWrite(motorPin4, LOW);
  delay(motorDelay);
 
  digitalWrite(motorPin1, HIGH);
  digitalWrite(motorPin2, LOW);
  digitalWrite(motorPin3, HIGH);
  digitalWrite(motorPin4, HIGH);
  delay(motorDelay);  
 
  digitalWrite(motorPin1, HIGH);
  digitalWrite(motorPin2, LOW);
  digitalWrite(motorPin3, LOW);
  digitalWrite(motorPin4, HIGH);
  delay(motorDelay);  
 
  digitalWrite(motorPin1, HIGH);
  digitalWrite(motorPin2, HIGH);
  digitalWrite(motorPin3, LOW);
  digitalWrite(motorPin4, HIGH);
  delay(motorDelay); 
 
  digitalWrite(motorPin1, LOW);
  digitalWrite(motorPin2, HIGH);
  digitalWrite(motorPin3, LOW);
  digitalWrite(motorPin4, HIGH);
  delay(motorDelay); 
 
  digitalWrite(motorPin1, LOW);
  digitalWrite(motorPin2, HIGH);
  digitalWrite(motorPin3, HIGH);
  digitalWrite(motorPin4, HIGH);
  delay(motorDelay); 
 
  digitalWrite(motorPin1, LOW);
  digitalWrite(motorPin2, HIGH);
  digitalWrite(motorPin3, HIGH);
  digitalWrite(motorPin4, LOW);
  delay(motorDelay); 
 
  digitalWrite(motorPin1, HIGH);
  digitalWrite(motorPin2, HIGH);
  digitalWrite(motorPin3, HIGH);
  digitalWrite(motorPin4, LOW);
  delay(motorDelay); 
}

Video:

Circuit diagram from link for reference:

Category: Uncategorized  |  5 Comments

Using the Sony Bloggie 360 lens with a normal camera

May 17, 2012, 4:03 am

I have a 360degree lens from a Sony bloggie, but no longer have the camera. Turns out you can jam it on to a normal camera and use imagemagick to convert the images.

I balanced the 360lens on my LX3:

Here’s the raw image, after cropping:

I then used the imagemagick as follows:

convert ~/hackersapce_crop.jpg +distort DePolar 0 ~/hackerspace_unwrap.jpg

After cropping the image looks like this:

Be nice if I could focus the image onto a webcam CCD directly, anyway an interesting lens to play with.

Category: Uncategorized  |  2 Comments

Allow all file uploads in mediawiki

April 21, 2012, 1:46 am

I wanted to allow /all/ file uploads on a mediawiki installation (debian squeeze). This included files with no extension. This was harder than I thought, as there’s no extensionless option in mediawiki, you have to hack the sourcecode.

Add the following to LocalSettings.php:

$wgStrictFileExtensions = false;
$wgCheckFileExtensions = false;

edit /etc/php5/conf.d/suhosin.ini and change:

;suhosin.upload.disallow_elf = on

to

suhosin.upload.disallow_elf = off

Edit: /usr/share/mediawiki/includes/specials/SpecialUpload.php comment out the following block:

/*
                if ($finalExt == '') {
                        return self::FILETYPE_MISSING;
                } elseif ( $this->checkFileExtensionList( $ext, $wgFileBlacklist ) ||
                                ($wgCheckFileExtensions && $wgStrictFileExtensions &&
                                        !$this->checkFileExtension( $finalExt, $wgFileExtensions ) ) ) {
                        $resultDetails = array( 'finalExt' => $finalExt );
                        return self::FILETYPE_BADTYPE;
                }
*/
Category: Uncategorized  |  1 Comment
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