New approach to Rotary Encoder

[HenrikOlsson]

Hi Ioannis,
I haven't looked at the particular code in question but generally, you decode all 4 edges, hence the term quadrature. Look at the capture for one click, first Ch.0 goes low (1) then Ch.1 goes low (2), then Ch.0 goes high (3) and finally Ch.1 goes high (4). So, 4 counts per click.

/Henrik.

[Ioannis]

Hmm, thanks Henrik, it looks logic now... well...

Ioannis

[Demon]

I need a rotary encoder for manual input in flight simulator; changing radio frequency, autopilot altitude, etc. I like the "slower" detection in post #1 for this particular application or else I'd issue 4 keyboard commands in a single detent. 100 feet would change to 500 feet with a single click with no way to set to the in-between values.

But Podgy brings up a very important point; all rotary encoder datasheets I've seen mention debounce. I know most PIC inputs have Schmitt triggers, but just how effective are they in these cases? I can't test until my batch arrives.

Robert

[Ioannis]

a couple of 100nF were needed for mine. After placing the caps to ground from each encoder output pin, false readings were a past.

Ioannis

[fratello]

Need help with one enconder ... a little different.
How can I read the "up/+" and "down/-" action of this particular encoder ?
Any help will be appreciated ! Thanks in advance !

[fratello]

It's ok something like this ?!

TrisA = %00000000
TrisB = %11110000
PortB = 0

Flag                var bit
Q_New               var Byte
Q_Old               var byte
M_Count             var byte [4]
P_Count             var byte [4]
Q_Count             var word

' ---------------------- Set variable value @ startup ----------------------  
     
For Q_Old = 0 to 3
Read Q_Old,M_Count[Q_Old]
Read Q_Old + 4,P_Count[Q_Old]
Next Q_Old
     
  Q_Count = 0   
    Q_New = 0
    Q_Old = 0
     Flag = 0  
                        

Goto Main_Loop

Encoder:                                    '
Q_New = PortB.7 + PortB.6 + PortB.5         ' get port status
 
If M_Count[Q_Old] = Q_New then              ' if M_Count code satisfied then minus
          Q_Count = Q_Count - 1
             Flag = 0                       ' set flag for DOWN
goto Q_Skip
endif

If P_Count[Q_Old] = Q_New then              ' if M_Count code satisfied then plus
          Q_Count = Q_Count + 1
             Flag = 1                       ' set flag for UP
endif


Q_Skip:
Q_Old = Q_New                               ' update Q_Old Byte
 

Main_Loop:   
if Flag = 1 then do command1                             
if Flag = 0 then do command2                                  
goto Main_Loop

[fratello]

So far...no good ...
Complete "hardware" it's like in picture . I intend to use an remote with some "rotary encoder" ...
The remote controller has six wires . They are connected to three rows and three columns. This allows maximum of 3*3=9 functions. Roller takes three functions because it must be possible to know which way it is rotated (how doing this in PBP ?!?). Rest of the functions are assigned to six buttons.
I use great pice of code (keypad matrix routine) of Mr. Mister-e and the "regular" buttons works verry fine...but I want to use the function of roller too.
I can't figure out how doing this, so any "clue" will be appreciated !