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“servo control with a pot” question — Parallax Forums

“servo control with a pot” question

GrampsGramps Posts: 117
edited 2010-04-21 23:52 in Learn with BlocklyProp
I’m working on “servo control with a pot” on page 158 WAM. The demo moves the servo about 45 degrees when the pot is moved 90 degrees. How do you match them so they both move together from 0 to 90?

Comments

  • PJAllenPJAllen Banned Posts: 5,065
    edited 2010-04-20 23:33 
    time VAR Word

DO
  HIGH 7
  PAUSE 10
  RCTIME 7, 1, time

[color=green]  time = time */ 185 ' Scale by 0.724 (X 256 for */).
  time = time + 500 ' Offset by 500.[/color]

  PULSOUT 14, time ' Send pulse to servo.
LOOP

    Given: PULSOUT 14, time··
    time is the position
    ··time·is the result of·the RCTIME operation

    Try different values in the two math operations (scaling and offset determinations)
  • GrampsGramps Posts: 117
    edited 2010-04-21 03:34
    Thank you!
  • PJAllenPJAllen Banned Posts: 5,065
    edited 2010-04-21 18:13
    Add a line with a·DEBUG to kick out the RCTIME value, so that you can see what's going on there, too.
  • GrampsGramps Posts: 117
    edited 2010-04-21 23:52
    Ok, thanks again, I was on the right track but didn't see results till I pushed the 185 number way up to 550.
    Now if i could just understand what's happening[noparse]:)[/noparse]
    It will sink in one day.............
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