# Arduino "Hunt The Wumpus" ## Overview & Parts ![](https://cdn-learn.adafruit.com/assets/assets/000/002/074/medium800/lcds___displays_Hunt_The_Wumpus_Splash.jpg?1396779005) You can relive the early days of computer gaming on your Arduino with [Hunt the Wumpus](http://en.wikipedia.org/wiki/Hunt_the_Wumpus).  This game is a particularly good fit for the RGB LCD shield: - Different screens can have different backlight colors - The LCD is large enough for selecting caves to move to or shoot into - The Wumpus, bat, and pit can all have custom characters - The D-Pad is well suited to handling menu navigation You will need: - [Adafruit RGB LCD Shield](https://www.adafruit.com/products/716) - [Arduino Uno](https://www.adafruit.com/products/50) ![](https://cdn-learn.adafruit.com/assets/assets/000/002/075/medium800/lcds___displays_Hunt_The_Wumpus_Room.jpg?1396779010) Of course, you do run the risk of taking a wrong turn and being eaten by a Wumpus! ![](https://cdn-learn.adafruit.com/assets/assets/000/002/076/medium800/lcds___displays_Hunt_The_Wumpus_Game_Over.jpg?1396779019) # Arduino "Hunt The Wumpus" ## Code While coding Hunt the Wumpus, I ran into a problem with one of my functions.  I wanted to use an [enum](http://en.wikipedia.org/wiki/Enumerated_type#C_and_syntactically_similar_languages) to represent different hazards (bats, pits, Wumpus) and have a common function to check a given cave for hazards and return the enum of the first one found.  This helps with showing hazards in neighboring caves as well as checking a cave before the player moves into it. I started by declaring a function which returns an enum: ```auto HazardType check_for_hazards(uint8_t room_idx) { if (room_idx == bat1_room || room_idx == bat2_room) { return BAT; } else if (room_idx == pit1_room || room_idx == pit2_room) { return PIT; } else if (room_idx == wumpus_room) { return WUMPUS; } else { return NONE; } } ``` Unfortunately, this resulted in the following error message: ```auto Hunt_The_Wumpus:-1: error: 'HazardType' does not name a type ``` It turns out that this is a known issue with a [documented workaround](http://arduino.cc/playground/Code/Enum) and the fix was as simple as adding a header file Hunt\_The\_Wumpus.h to my project which contains the enum declaration and a function prototype:```auto enum HazardType { NONE=0, BAT=1, PIT=2, WUMPUS=4 }; HazardType check_for_hazards(uint8_t room_idx); ``` And including the file at the top of the main Hunt\_The\_Wumpus.ino file: ```auto #include "Hunt_The_Wumpus.h" ``` Another interesting area of the code is related to reading button presses.  The RGB LCD shield library provides a function for reading which buttons are currently pressed as a bitmask.  For menu navigation, it's important to understand clicks.  By using a static unit8\_t to store the last state of the buttons, it's possible to determine which buttons have been pressed and then released.   ```auto void read_button_clicks() { static uint8_t last_buttons = 0; uint8_t buttons = lcd.readButtons(); clicked_buttons = (last_buttons ^ buttons) & (~buttons); last_buttons = buttons; } ``` # Arduino "Hunt The Wumpus" ## Downloads [Download the latest code on Github](https://github.com/adafruit/Hunt-The-Wumpus) Here's a 'diff' for monochrome displays! ```auto *** Hunt_The_Wumpus.ino.orig 2012-11-24 12:43:10.936042927 -0500 --- Hunt_The_Wumpus.ino 2012-11-24 13:14:11.908126852 -0500 *************** *** 42,47 **** --- 42,48 ---- #include #include "Hunt_The_Wumpus.h" + #define MONO 1 // cheapskate with no RGB (or they were out of stock) //! Map of the cavern layout. /*! *************** *** 270,276 **** --- 271,281 ---- //! Initial game state, draw the splash screen. void begin_splash_screen() { lcd.clear(); + #ifndef MONO lcd.setBacklight(TEAL); + #else + lcd.setBacklight(RED); // MONO backlight ON is on RED line + #endif lcd.print(F("HUNT THE WUMPUS")); state = animate_splash_screen; *************** *** 357,363 **** --- 362,370 ---- void begin_bat_move() { lcd.clear(); + #ifndef MONO lcd.setBacklight(BLUE); + #endif lcd.write(BAT_ICON_IDX); lcd.setCursor(5, 0); lcd.print(F("Bats!")); *************** *** 429,439 **** --- 436,448 ---- lcd.write(ARROW_ICON_IDX); lcd.print(arrow_count); + #ifndef MONO if (adjacent_hazards) { lcd.setBacklight(YELLOW); } else { lcd.setBacklight(TEAL); } + #endif lcd.setCursor(1, 1); for (int i=0; i-->")); arrow_count--; *************** *** 575,581 **** --- 590,598 ---- void draw_game_over_screen(uint8_t backlight, __FlashStringHelper *message, uint8_t icon) { lcd.clear(); + #ifndef MONO lcd.setBacklight(backlight); + #endif lcd.print(message); lcd.setCursor(0, 1); lcd.write(icon); ``` ## Related Guides - [IR Sensor](https://learn.adafruit.com/ir-sensor.md) - [MIDI for Makers](https://learn.adafruit.com/midi-for-makers.md) - [How to Build a Testing Jig](https://learn.adafruit.com/how-to-build-a-testing-fixture.md) - [Adafruit RS232 Pal](https://learn.adafruit.com/adafruit-rs232-pal.md) - [Adafruit PCF8574 I2C GPIO Expander](https://learn.adafruit.com/adafruit-pcf8574.md) - [Adafruit ESP32-S2 Reverse TFT Feather](https://learn.adafruit.com/esp32-s2-reverse-tft-feather.md) - [Control Electronics with your Brain using NextMind](https://learn.adafruit.com/control-electronics-with-your-brain-using-nextmind.md) - [Arduino "Hunt The Wumpus"](https://learn.adafruit.com/arduino-hunt-the-wumpus.md) - [Adafruit TRRS Trinkey](https://learn.adafruit.com/adafruit-trrs-trinkey.md) - [Adafruit DACx578 - 8 x Channel I2C DAC](https://learn.adafruit.com/adafruit-dac7578-8-x-channel-12-bit-i2c-dac.md) - [Adafruit AS7331 UV / UVA / UVB / UVC Sensor](https://learn.adafruit.com/adafruit-as7331-uv-uva-uvb-uvc-sensor.md) - [Adafruit IO IOT Hub with the Adafruit FunHouse](https://learn.adafruit.com/adafruit-io-hub-with-the-adafruit-funhouse.md) - [Using Raspberry Pi Pico and Pico 2 with Arduino](https://learn.adafruit.com/using-raspberry-pi-pico-pico-2-with-arduino.md) - [Arduboy Game Controller Hack](https://learn.adafruit.com/arduboy-game-controller.md) - [Adafruit LTR-329 and LTR-303 Light Sensors](https://learn.adafruit.com/adafruit-ltr-329-ltr-303.md)