Prepared by: F. San – 1 relay control circuit pic-16f84 is based on the keypad’s LED indicators and buzzer alert source. Bass. Hex code and simulation files have isis proteus. Thanks to the people who contributed to prepare. 4... Electronics Projects, Programmable Combination Lock Circuit PIC16F84 "microchip projects, microcontroller projects, pic16f84 projects, " Date 2019/08/02