I know for a fact some EEPOTs just have UP and DOWN pins as opposed to a regular serial interface. Perhaps those are the ones he is referring to? On Sat, Mar 7, 2015 at 2:04 AM, embedded systems wrote= : > Harold, your question is weird. > The EEPOT needs usually a serial interface. > The quadrature encoder need a programable part to read it. > Since both need a microcontroller, why don't you use it? > > Vasile --=20 Jason White --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .