title: hardware programming to control machine movement
body: <p>how does a computer program control a mechanical movement, what is the bridge between the object code and a certain machine part.</p>
  
  <p>Let us say I have a certain paint sprayer which is directed, and I wanted that to move circularly either</p>
  
  <pre><code>1. Start at the circumference of a certain radius circle and paint circularly and stop when it reaches to the center of the circle or
  2. start at the center of the circle and run around until it reaches a certain radius.
  </code></pre>
  
  <p>and if I represent my sprayer as noselPaint and how that progamatic noselPaint construct is linked to actual spraying tip to control its movement in a uniform manner.</p>