Build a "Ghostly Doorbell" that plays spooky sounds or a "Talking Doormat" that greets (or warns) visitors.
While the specific PIC16F84A has been surpassed by faster, cheaper chips with more peripherals, the concepts remain timeless. The laws of electricity (Ohm’s Law, Kirchhoff’s Laws) have not changed, and the fundamental architecture of microcontrollers remains rooted in the principles taught in this book. Build a "Ghostly Doorbell" that plays spooky sounds