counter and switch programming help

w. williams

i'm doing a mini scoreboard project and im trying to write the code for a counter that is controlled by a "flingy" switch (sorry don't know correct term).· I just simply want the counter to count up one number when i fling the switch up (I position), and count down one number when i fling the switch down (O position).· i dont want the counter to count unless the switch tells it to.· If anyone can help me i would greatly appreciate it.·

Erik Arendall

You can get a SPDT switch and monitor the pins for direction. If Pin 1 goes High you can increment a counter , and if pin 2 goes high you can decrement a counter. You will just have to put your switch in the direction you want.

Jon Williams

Erik has it.· Here's a bit of code to get you started.· Note the the constant called SwDelay lets you control how fast the count increments or decrements when you're holding the switch.· If you don't hold it, the delay should be enough to give a single count per "flick."

' {$STAMP BS2}
' {$PBASIC 2.5}
 
CntUp      PIN    0
CntDn      PIN    1
 
CntMax     CON    100
CntMin     CON    0
 
Yes        CON    1
No         CON    0
SwDelay    CON    500
 
counter    VAR    Word
 
 
Main:
  DO
 
    IF (CntUp = Yes) THEN
      IF (counter < CntMax) THEN
        counter = counter + 1
        GOSUB Update_Display
        PAUSE SwDelay
      ENDIF
    ENDIF
 
    IF (CntDn = Yes) THEN
      IF (counter > CntMin) THEN
        counter = counter - 1
        GOSUB Update_Display
        PAUSE SwDelay 
      ENDIF
    ENDIF
 
  LOOP
 
  END
 
 
Update_Display:
  
  ' your code here...
 
  RETURN

A schematic is attached.

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Jon Williams
Applications Engineer, Parallax
Dallas, TX· USA

Post Edited (Jon Williams) : 2/3/2005 6:51:03 PM GMT

w. williams

thanks so much for your help!! i really appreciate it!