ENCODER-KY-040.txt

\ tested with  Encoder KY-040  it works ok
\ needs cap 0.1 filter on each input +R 220Ohms
\ by PeterForth July2021 with Christian Hinse

interrupts

15 input pinmode      \   set GPIO15 as an input
4 input  pinmode      \   set GPIO4  as an input
 
4 gpio_pulldown_en  
15 gpio_pulldown_en
2drop

timers
 
0 value var   0 value oldA   0 value pinA  0 value pinB
 
: readvar  ( --) 
             4 digitalread  to pinB   15 digitalRead DUP to pinA 
             if                \  pin A  high 
               oldA if         \  no change  
		    else       \  ****  rising edge 
	            pinB if  1 +to var else  -1 +to var then  
		    then
             then               \  pin A  low 
pinA to oldA                    \  save state
RERUN	 ;					
 
' readvar  10000 0 interval   \ and run that every 1/100 seconds
                              \ experiment with other values...   

:  v.     cr var . ;          \ helping word to watch counter and debug