How To | Drive "up" and "down" controls for a projector screen

Learn how to use up and down projector screen controls to position your projection correctly.

Updated at May 11th, 2023

Procedure


Example 1


Provides a pulse on the "Screen_Dn" pin when the toggle button turns on and a pulse on the "Screen_Up" pin when the toggle button turns off. The Control Delay component sets the length of the pulse.


Example 2


Same operation as Example 1 but with a slightly different arrangement. This one uses Flip-Flops to drive the outputs instead. It also includes a Selector option to provide a slightly different option to drive the states than just the toggle button. Note that this could be used with only the toggle button, only the Selector, or both depending on the application requirements.



Example 3


Provides a steady level on either the "Up" or "Down" pin depending on the state of the toggle button. A delay is incorporated so the previously "on" pin turns off before the new one turns on. The "Delay Down" controls the delay between the "Screen Up 1" pin going off and the "Screen Dn 1" pin going on. The "Delay Up" controls the delay between the "Screen Down 1" pin going off and the "Screen up 1" pin going on.