Originally Posted by bborb  Picture a dragstrip where cars drag race. Now build a picket fence the length of the dragstrip, right in the middle between the two lanes of the dragstrip. The slats of the picket fence are 6inches wide and placed 6inches apart. Now you and a buddy are racing, at night, and your cars are equally fast so you are neck and neck the whole way. Here's where your question comes into play. During the race, you shine a flashlight at the picket fence and on the other side your buddy observes what appears to be a light that is flashing very fast. Now your buddy is Superman and he can count very fast, and he can count the flashes of light and compute at any moment how far he's travelled since you turned on the flashlight.
The encoder strip is the picket fence, and you and your buddy are "Team Reader Head"...... you being an LED and Superman is an opto-sensor which turns on and off 5volts, ON when light hits it and OFF when light is blocked. |
Even a dumy undestand that explanation.. Thanks man!!
But sometingh i didnt have clear is this:
The slats are, from beguining to end, 6 inches wide and apart? So the feedbach reduces just to confirm movement and that movement is of 6 inches.
Wath about slats 6 inches wide but 6.1,6.2,6.3,6.4...inches APART, to feedback not only position and movement, also THE EXACT PART OF THE DRAGSTRIP WERE YOU ARE LOCATED (Called pulse weigh modulation??).
Now this is beyon encoder strips, but it is a question i have. (I was studing stepper motors the last months, so my main experience are with this...).
Oh! another thin:
on a servo system, that pulses (The light´s my frend count and compute) only are send to the controller board, or are send to te computer and the computer do wath it considers the best?
I read about the EMC software for linux, witch is able to accept IN pulses from servo feedback and do with them wath she wants (So...Wath i want)