ofc i tested first with simple pot. controll, hardware is ok. problem was lcd,print, and lcdsetcursor.
lcd generating to much delay in code.
i tried serial print also but nothing.
it is working fine now, but i cant get speed displayed 
ofc i tested first with simple pot. controll, hardware is ok. problem was lcd,print, and lcdsetcursor.
lcd generating to much delay in code.
i tried serial print also but nothing.
it is working fine now, but i cant get speed displayed