Project

Microwave Oven Firmware

PIC-based microwave firmware with a modular screen-state FSM, keypad scanning, Timer2 timing, and LCD-driven UI.

2025 PIC/Embedded-C/FSM/XC8

Overview

Built firmware for a PIC microcontroller-based microwave oven using a modular architecture and a screen-state finite state machine.

Highlights

Targeted PIC @ 20 MHz (XC8 toolchain)
Implemented 16x4 LCD driver in 4-bit mode
Built matrix keypad scanning with state and level read modes
Implemented operating flows for Micro, Grill, Convection, and Quick Start
Added Timer2 ISR timing for countdown control (about 1 second tick logic)
Added hardware controls for fan and buzzer during cook/preheat states
Reduced display flicker using pre-draw and sparse UI updates

Architecture

FSM-based screen navigation:
- power screen -> modes
- mode screens -> time/temp input -> cooking
HAL modules for LCD, keypad, and timers separated by header/source boundaries

Outcome

Delivered a robust embedded UI and control flow implementation with clean module boundaries and real-device interaction handling.