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Hunt the Lunpus

Hunt the Lunpus is a handheld adaptation of the classic 1970s text-based game Hunt the Wumpus, built on the ATmega328p microcontroller. It is based on Douglas McInnes's Lunpus project, which provided the foundation for this adaptation.

lunpus (2)

Check out the video in action

Overview

Hunt the Lunpus is a handheld game console where the player explores a dangerous cave system filled with traps and a monstrous creature, the Lunpus. The objective is to avoid the deadly hazards, locate the Lunpus, and defeat it before it awakens. It uses seven-segment displays to represent the cave walls and hazards. This project builds on Douglas's work with additional hardware features - adds visual feedback in the form of LED indicators with ATmega328p microcontroller for its additional capabilities.

How to Play

  • Start the Game: Press the ARROW button to begin the game.
  • Movement: Use the directional buttons (NORTH, SOUTH, EAST, WEST) to navigate the cave system. The walls of the cave will appear on the seven-segment display.
  • Avoid Hazards:
    • Superbats: Transport you to a random location if encountered.
    • Slime Pits: Instant death upon falling into one.
    • Lunpus: The sleeping monster will eat you if disturbed.
  • Hazard Warnings:
    • LED Indicators: The Wind LED warns of nearby Slime Pits, while the Stench LED lights up when close to the Lunpus.
    • Sound Alerts: Wind sounds indicate pits, and snoring sounds warn that the Lunpus is near.
  • Fire Arrows: Press the ARROW button to check your remaining arrows. Press a directional button to fire an arrow in that direction.
  • Game Over: If you die or run out of arrows, press the ARROW button to restart.

PCB & Schematic

The pcb directory includes EasyEDA project files that outline the schematic and PCB design. image

Timer-Driven Processes

void loop() {
    static unsigned long timer = millis();
    (*currentStateFn)(timer); // State-specific processing

    updateAudio(timer); // Audio management
    sevsegshift.refreshDisplay(); // Display refresh
}

key features

  • Provides non-blocking time tracking:
    • In the loop() function, timer = millis() captures the current time in milliseconds. Various functions then use this timer to determine when to perform actions without stopping the entire program execution. For example, in renderText(), it uses timer comparisons to manage timing:
static unsigned long nextAction = 0;
if (nextAction > timer) {
return;
}
nextAction = timer + 400;
  • State functions using timer like updateAudio() check timer without blocking game progression
  void updateAudio(unsigned long timer) {
// Non-blocking audio processing
//- Tracks next note timing
//- Manages song progression dynamically
    if (nextNoteTime == 0) return;
    if (timer < nextNoteTime) return;

    playNote(currentSong[currentNote]);
    nextNoteTime = duration + timer;
}

  • No delay() functions used

  • Supports pseudo-random timing variations:

    • Uses random() with timer. The combination of timer and random() creates a more natural, preventing monotonous, mechanical-feeling animations or interactions.
nextAction = timer + 400 + random(600); // Randomized bat animation
  • Enables concurrent process management:
    • Simultaneously manages:
      • Audio updates
      • Display refreshes
      • Hazard warnings
      • Player input processing

State Machine Diagram

Image