pinky

hi everybody,

i am designing a PI controller using pic16f877.This is used for temperature controller. For PI I have to define P&I constants and setpoint from outside. give me an idea to design a user interface to view current values of P&I constant and to change from user interface is needed.

thanks for your timely help

Nigel Goodwin

How about an LCD text display and a keypad, you could use a menu system to select different options. Depending on how many keys you use on the keypad, you could either enter values directly, or just have UP, DOWN, BACK and ENTER keys. Once the values have been entered they could be stored in the 877's EEPROM area and restored when the PIC powers up.