Reading if Pin is High or Low?

[Spindle]

Ok the only problem is now if I switch it one way and then switch it to the middle the motor still goes because I guess the command is still being sent to the motor driving circuit. There is however a _break pin you can control. See attached image. Other than how its wired from the diagram mister_e posted the ground that comes off my chip goes to the switch and then to PIN 12. This drives it low and disables the H-Bridge on circuit. The problem when the switch is turned left or right for forward and reverse movement nothing happens because _break is still being driven low. I can't think how I can make it high when the switch is left or right. Maybe instead of connecting the pin to the ground, connect it to another portb pin and when its switch left make that pin high but i don't think to 5 volt supplies will work on a switch :P again I am no electrical engineer but am trying my hardest. Any help is apreciated. Please check out the picture I basically want to do that with the break switch but only when the SPDT switch is in the middle. When its to the left and right have _break go back high.

[mister_e]

can you provide the whole datasheet or a link of this specific motor controller???

[Spindle]

Motion Mind Module

http://www.solutions-cubed.com/solut...d/MM1_2005.htm

http://www.solutions-cubed.com/solut...s/MOTMDS_4.pdf

Thanks!

[mister_e]

<img src="http://www.picbasic.co.uk/forum/attachment.php?attachmentid=390&stc=1">
Well i guess you could fix about everything by reading the actual motor position and tell him to go to the readed position.

well to make it more clear... here's a snip of the idea

MAIN:
    IF (UP = 0) AND (DOWN=1) THEN
       serout FM, T9600 ,["W01 01 200", CR, LF] 'Write velocity limit value 
       serout FM,T9600,["P01 270000", CR, LF] 'Send MOVETO_ABSOLUTE command
       ENDIF

    IF (DOWN = 0) AND (UP = 1) THEN
       serout FM, T9600 ,["W01 01 200", CR, LF] 'Write velocity limit value 
       serout FM,T9600,["P01 0", CR, LF] 'Send MOVETO_ABSOLUTE command
       ENDIF

    if (DOWN = 1) AND (UP = 1) then 
       ' SERIN motor position
       ' SEROUT motor position to make him stop
       endif
    
    goto MAIN
    End

it's an idea. Let us know!

[mister_e]

OR... use a variable and increment/decrement it on each IF THEN statement... the only thing... i don't know how the movement will be produced... probably it will not going to be purely smooth.

try

PositionHB var byte
PositionLB var word
T9600      con 84   ' 9600 bauds

MAIN:
    IF (UP = 0) AND (DOWN=1) THEN
       serout2 FM, T9600 ,["W01 01 200", CR, LF] 'Write velocity limit value 
       if positionlb < 9999 then
          if positionhb != 27 then 
             positionlb = positionlb+1
             endif
          else
              positionlb = 0
              if positionhb < 27 then
                 positionhb = positionhb+1
                 endif
          endif

       serout2 FM,T9600,["P01 ",dec2 positionhb,dec4 positionlb,_
                         CR, LF] 'Send MOVETO_ABSOLUTE command
       ENDIF

    IF (DOWN = 0) AND (UP = 1) THEN
       serout2 FM, T9600 ,["W01 01 200", CR, LF] 'Write velocity limit value 
       if positionlb then
          positionlb = positionlb - 1
          else
              positionlb = 9999
              if positionhb then
                 positionhb = positionhb-1
                 endif
          endif

       serout2 FM,T9600,["P01 ",dec2 positionhb,dec4 positionlb,_
                         CR, LF] 'Send MOVETO_ABSOLUTE command
       ENDIF

    goto MAIN
    End

there's probably something i missed in the math condition but, this have to work... well i guess.

[Spindle]

thanks mister_e I am gonna try your first thing, this is for a motorized shade application so the next step is to have the position constantly store the absolute position in the PICs eeprom incase the main power is cut it won't be confused when power is applied again. Thats aways off, first thing is first, I shall try your solution!

[Spindle]

I tried your first solution and no go. When you flip the switch one way it still goes forward and when you flip the switch the other way it still goes reverse. But if you were to flip it from left to center it would still spin and NOT shut off. Same if you were to flip it from right to center. It would still move (the motor) until it gets to that absolute position. Some how I have to ustilize that _break pin because brining it low disables the H-Bridge. I have to do that somehow where if the switch is to the left or right its not pulled low. Mister E. It is wired up like your diagram in your previous posts.