Tug of War Arduino Game on WS2812 Led strip

This is an interesting and simple to make two player Arduino game that can be made in less than a day.

Jan 30, 2025

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Games

Kids

Lights

Components and supplies

Push Button

Piezo Buzzer

Arduino Nano

Transistor NPN (BC547 or similar)

10kOhm potentiometer

Adressable WS2812B RGB LED light strip

Tools and machines

Soldering kit

Apps and platforms

Arduino IDE

Project description

Code

code tug

cpp

1#include <Adafruit_NeoPixel.h>
2
3// Pin definitions
4#define LED_PIN 6
5#define BUTTON1_PIN 2        // Player 1 button
6#define BUTTON2_PIN 3        // Player 2 button
7#define BUZZER_PIN 4         // Buzzer pin
8#define LED_INTENSITY_POT A0 // Potentiometer for LED brightness
9#define SPEED_POT A1        // Potentiometer for game speed
10#define POWER1_PIN 7        // Player 1 power move button
11#define POWER2_PIN 8        // Player 2 power move button
12
13// LED strip configuration
14#define NUM_LEDS 60         // Total number of LEDs (29 + 2 + 29)
15#define CENTER_POS 30       // Center position (0-based index)
16
17// Game constants
18#define DEBOUNCE_TIME 50    // Button debounce time in milliseconds
19#define VICTORY_FLASHES 3   // Number of victory flashes
20#define FLASH_DELAY 200     // Delay between flashes in milliseconds
21#define MIN_CLICK_SPEED 1   // Minimum pixels to move per click
22#define MAX_CLICK_SPEED 5   // Maximum pixels to move per click
23
24// Power move constants
25#define POWER_BOOST 3       // Fixed amount added to speed during power move
26#define POWER_MOVES_COUNT 3 // Number of powered moves each player gets
27#define POWER_FLASH_DURATION 500 // Duration of power move activation flash
28#define MAX_POWER_SPEED (MAX_CLICK_SPEED + 2) // Maximum speed during power move
29
30// Initialize LED strip
31Adafruit_NeoPixel strip = Adafruit_NeoPixel(NUM_LEDS, LED_PIN, NEO_GRB + NEO_KHZ800);
32
33// Colors
34uint32_t COLOR_RED;
35uint32_t COLOR_BLUE;
36uint32_t COLOR_YELLOW;
37uint32_t COLOR_MAGENTA;
38const uint32_t COLOR_OFF = strip.Color(0, 0, 0);
39
40// Game state variables
41int flagPosition = CENTER_POS;  // Current position of the center of the red flag
42unsigned long lastButton1Press = 0;
43unsigned long lastButton2Press = 0;
44bool gameActive = false;  // Changed to false initially
45int clickSpeed = 1;      // Number of pixels to move per click
46
47// Power move state variables
48bool player1PowerActive = false;
49bool player2PowerActive = false;
50int player1PowerMovesLeft = 0;
51int player2PowerMovesLeft = 0;
52bool player1PowerAvailable = true;  // Can only use once per round
53bool player2PowerAvailable = true;  // Can only use once per round
54unsigned long lastPower1Press = 0;
55unsigned long lastPower2Press = 0;
56
57bool button1LastState = HIGH;
58bool button2LastState = HIGH;
59bool power1LastState = HIGH;
60bool power2LastState = HIGH;
61
62void setup() {
63  // Initialize LED strip
64  strip.begin();
65  strip.show();
66  
67  // Set up buttons with internal pull-up resistors
68  pinMode(BUTTON1_PIN, INPUT_PULLUP);
69  pinMode(BUTTON2_PIN, INPUT_PULLUP);
70  pinMode(POWER1_PIN, INPUT_PULLUP);
71  pinMode(POWER2_PIN, INPUT_PULLUP);
72  pinMode(BUZZER_PIN, OUTPUT);
73  pinMode(LED_INTENSITY_POT, INPUT);
74  pinMode(SPEED_POT, INPUT);
75
76    button1LastState = digitalRead(BUTTON1_PIN);
77    button2LastState = digitalRead(BUTTON2_PIN);
78    power1LastState = digitalRead(POWER1_PIN);
79    power2LastState = digitalRead(POWER2_PIN);
80  
81  // Initial game state
82  resetGame();
83}
84
85void loop() {
86  if (!gameActive) {
87    playStartSequence();
88  }
89  
90  if (gameActive) {
91    // Update LED brightness based on potentiometer
92    updateColors();
93    
94    // Update game speed based on potentiometer
95    updateGameSpeed();
96    
97    // Check for power moves
98    checkPowerMoves();
99    
100    // Check for button presses with debounce
101    checkButtons();
102    updateLEDs();
103  }
104}
105
106void checkPowerMoves() {
107    // Read current power button states
108    bool power1CurrentState = digitalRead(POWER1_PIN);
109    bool power2CurrentState = digitalRead(POWER2_PIN);
110    
111    // Check Player 1 power move button
112    if (power1CurrentState == LOW && power1LastState == HIGH) {  // Detect only falling edge
113        if (millis() - lastPower1Press > DEBOUNCE_TIME && player1PowerAvailable) {
114            activatePowerMove(1);
115            lastPower1Press = millis();
116        }
117    }
118    
119    // Check Player 2 power move button
120    if (power2CurrentState == LOW && power2LastState == HIGH) {  // Detect only falling edge
121        if (millis() - lastPower2Press > DEBOUNCE_TIME && player2PowerAvailable) {
122            activatePowerMove(2);
123            lastPower2Press = millis();
124        }
125    }
126
127        // Update power button states
128    power1LastState = power1CurrentState;
129    power2LastState = power2CurrentState;
130}
131
132void activatePowerMove(int player) {
133    if (player == 1 && player1PowerAvailable) {
134        player1PowerActive = true;
135        player1PowerMovesLeft = POWER_MOVES_COUNT;
136        player1PowerAvailable = false;
137        flashPowerMove(1);
138    } else if (player == 2 && player2PowerAvailable) {
139        player2PowerActive = true;
140        player2PowerMovesLeft = POWER_MOVES_COUNT;
141        player2PowerAvailable = false;
142        flashPowerMove(2);
143    }
144}
145
146void flashPowerMove(int player) {
147    strip.clear();
148    // Flash player's side
149    if (player == 1) {
150        for (int i = 0; i < CENTER_POS; i++) {
151            strip.setPixelColor(i, COLOR_MAGENTA);
152        }
153        tone(BUZZER_PIN, 2000, 200); // Power move activation sound
154    } else {
155        for (int i = CENTER_POS; i < NUM_LEDS; i++) {
156            strip.setPixelColor(i, COLOR_MAGENTA);
157        }
158        tone(BUZZER_PIN, 2500, 200); // Power move activation sound
159    }
160    strip.show();
161    delay(POWER_FLASH_DURATION);
162    updateLEDs();
163}
164
165void playStartSequence() {
166  // First update colors for the sequence
167  updateColors();
168  
169  // Flash center position in preparation
170  for (int i = 0; i < 3; i++) {
171    // First two beeps with one frequency
172    if (i < 2) {
173      strip.clear();
174      strip.setPixelColor(CENTER_POS, COLOR_RED);
175      strip.setPixelColor(CENTER_POS - 1, COLOR_RED);
176      strip.show();
177      tone(BUZZER_PIN, 800, 200);  // Lower frequency for ready beeps
178      delay(300);
179      
180      strip.clear();
181      strip.show();
182      delay(300);
183    }
184    // Final beep with different frequency
185    else {
186      strip.clear();
187      strip.setPixelColor(CENTER_POS, COLOR_MAGENTA);
188      strip.setPixelColor(CENTER_POS - 1, COLOR_MAGENTA);
189      strip.show();
190      tone(BUZZER_PIN, 1200, 400);  // Higher frequency for start beep
191      delay(400);
192    }
193  }
194  
195  // Start the game
196  gameActive = true;
197  flagPosition = CENTER_POS;
198  updateLEDs();
199}
200
201void updateColors() {
202  // Read LED intensity from potentiometer (0-255)
203  int intensity = map(analogRead(LED_INTENSITY_POT), 0, 1023, 0, 255);
204  
205  // Update colors with new intensity
206  COLOR_RED = strip.Color(intensity, 0, 0);
207  COLOR_BLUE = strip.Color(0, 0, intensity);
208  COLOR_YELLOW = strip.Color(intensity, intensity, 0);
209  COLOR_MAGENTA = strip.Color(intensity, 0, intensity);
210}
211
212void updateGameSpeed() {
213  // Read speed value from potentiometer
214  clickSpeed = map(analogRead(SPEED_POT), 0, 1023, MIN_CLICK_SPEED, MAX_CLICK_SPEED);
215}
216
217void checkButtons() {
218    // Read current button states
219    bool button1CurrentState = digitalRead(BUTTON1_PIN);
220    bool button2CurrentState = digitalRead(BUTTON2_PIN);
221    
222    // Check Player 1 button (pulls flag left)
223    if (button1CurrentState == LOW && button1LastState == HIGH) {  // Detect only falling edge
224        if (millis() - lastButton1Press > DEBOUNCE_TIME) {
225            // Calculate move amount with a more balanced power multiplier
226            int moveAmount = clickSpeed;
227            if (player1PowerActive && player1PowerMovesLeft > 0) {
228                moveAmount = min(moveAmount + POWER_BOOST, MAX_POWER_SPEED);
229                player1PowerMovesLeft--;
230                if (player1PowerMovesLeft <= 0) {
231                    player1PowerActive = false;
232                }
233            }
234            flagPosition -= moveAmount;
235            tone(BUZZER_PIN, player1PowerActive ? 800 : 1000, 20);
236            lastButton1Press = millis();
237        }
238    }
239    
240    // Check Player 2 button (pulls flag right)
241    if (button2CurrentState == LOW && button2LastState == HIGH) {  // Detect only falling edge
242        if (millis() - lastButton2Press > DEBOUNCE_TIME) {
243            int moveAmount = clickSpeed;
244            if (player2PowerActive && player2PowerMovesLeft > 0) {
245                moveAmount = min(moveAmount + POWER_BOOST, MAX_POWER_SPEED);
246                player2PowerMovesLeft--;
247                if (player2PowerMovesLeft <= 0) {
248                    player2PowerActive = false;
249                }
250            }
251            flagPosition += moveAmount;
252            tone(BUZZER_PIN, player2PowerActive ? 1300 : 1500, 20);
253            lastButton2Press = millis();
254        }
255    }
256    
257    // Update button states
258    button1LastState = button1CurrentState;
259    button2LastState = button2CurrentState;
260    
261    // Keep flag position within bounds
262    flagPosition = constrain(flagPosition, 1, NUM_LEDS - 2);
263    
264    // Check for victory conditions
265    if (flagPosition <= 1 || flagPosition >= NUM_LEDS - 2) {
266        gameActive = false;
267        celebrateVictory();
268    }
269}
270
271void updateLEDs() {
272  strip.clear();
273  
274  // Draw the red flag (2 LEDs)
275  strip.setPixelColor(flagPosition, COLOR_RED);
276  strip.setPixelColor(flagPosition - 1, COLOR_RED);
277  
278  // Draw Player 1 side (blue)
279  for (int i = 0; i < flagPosition - 1; i++) {
280    strip.setPixelColor(i, i == 0 ? COLOR_MAGENTA : COLOR_BLUE);
281  }
282  
283  // Draw Player 2 side (yellow)
284  for (int i = flagPosition + 1; i < NUM_LEDS; i++) {
285    strip.setPixelColor(i, i == NUM_LEDS - 1 ? COLOR_MAGENTA : COLOR_YELLOW);
286  }
287  
288  strip.show();
289}
290
291void celebrateVictory() {
292  // Determine winner's color
293  uint32_t winnerColor = (flagPosition <= 1) ? COLOR_BLUE : COLOR_YELLOW;
294  
295  // Victory tune
296  if (flagPosition <= 1) {
297    playVictoryTune(1000);  // Lower pitch for Player 1
298  } else {
299    playVictoryTune(1500);  // Higher pitch for Player 2
300  }
301  
302  // Flash victory animation
303  for (int i = 0; i < VICTORY_FLASHES; i++) {
304    // Fill with winner's color
305    for (int j = 0; j < NUM_LEDS; j++) {
306      strip.setPixelColor(j, winnerColor);
307    }
308    strip.show();
309    delay(FLASH_DELAY);
310    
311    // Turn off
312    strip.clear();
313    strip.show();
314    delay(FLASH_DELAY);
315  }
316  
317  delay(3000);
318  resetGame();
319}
320
321void playVictoryTune(int baseFreq) {
322  tone(BUZZER_PIN, baseFreq, 200);
323  delay(200);
324  tone(BUZZER_PIN, baseFreq * 1.25, 200);
325  delay(200);
326  tone(BUZZER_PIN, baseFreq * 1.5, 400);
327  delay(400);
328}
329
330void resetGame() {
331    flagPosition = CENTER_POS;
332    gameActive = false;
333    player1PowerActive = false;
334    player2PowerActive = false;
335    player1PowerMovesLeft = 0;
336    player2PowerMovesLeft = 0;
337    player1PowerAvailable = true;
338    player2PowerAvailable = true;
339    updateLEDs();
340}

#include <Adafruit_NeoPixel.h>

// Pin definitions
#define LED_PIN 6
#define BUTTON1_PIN 2        // Player 1 button
#define BUTTON2_PIN 3        // Player 2 button
#define BUZZER_PIN 4         // Buzzer pin
#define LED_INTENSITY_POT A0 // Potentiometer for LED brightness
#define SPEED_POT A1        // Potentiometer for game speed
#define POWER1_PIN 7        // Player 1 power move button
#define POWER2_PIN 8        // Player 2 power move button

// LED strip configuration
#define NUM_LEDS 60         // Total number of LEDs (29 + 2 + 29)
#define CENTER_POS 30       // Center position (0-based index)

// Game constants
#define DEBOUNCE_TIME 50    // Button debounce time in milliseconds
#define VICTORY_FLASHES 3   // Number of victory flashes
#define FLASH_DELAY 200     // Delay between flashes in milliseconds
#define MIN_CLICK_SPEED 1   // Minimum pixels to move per click
#define MAX_CLICK_SPEED 5   // Maximum pixels to move per click

// Power move constants
#define POWER_BOOST 3       // Fixed amount added to speed during power move
#define POWER_MOVES_COUNT 3 // Number of powered moves each player gets
#define POWER_FLASH_DURATION 500 // Duration of power move activation flash
#define MAX_POWER_SPEED (MAX_CLICK_SPEED + 2) // Maximum speed during power move

// Initialize LED strip
Adafruit_NeoPixel strip = Adafruit_NeoPixel(NUM_LEDS, LED_PIN, NEO_GRB + NEO_KHZ800);

// Colors
uint32_t COLOR_RED;
uint32_t COLOR_BLUE;
uint32_t COLOR_YELLOW;
uint32_t COLOR_MAGENTA;
const uint32_t COLOR_OFF = strip.Color(0, 0, 0);

// Game state variables
int flagPosition = CENTER_POS;  // Current position of the center of the red flag
unsigned long lastButton1Press = 0;
unsigned long lastButton2Press = 0;
bool gameActive = false;  // Changed to false initially
int clickSpeed = 1;      // Number of pixels to move per click

// Power move state variables
bool player1PowerActive = false;
bool player2PowerActive = false;
int player1PowerMovesLeft = 0;
int player2PowerMovesLeft = 0;
bool player1PowerAvailable = true;  // Can only use once per round
bool player2PowerAvailable = true;  // Can only use once per round
unsigned long lastPower1Press = 0;
unsigned long lastPower2Press = 0;

bool button1LastState = HIGH;
bool button2LastState = HIGH;
bool power1LastState = HIGH;
bool power2LastState = HIGH;

void setup() {
  // Initialize LED strip
  strip.begin();
  strip.show();
  
  // Set up buttons with internal pull-up resistors
  pinMode(BUTTON1_PIN, INPUT_PULLUP);
  pinMode(BUTTON2_PIN, INPUT_PULLUP);
  pinMode(POWER1_PIN, INPUT_PULLUP);
  pinMode(POWER2_PIN, INPUT_PULLUP);
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(LED_INTENSITY_POT, INPUT);
  pinMode(SPEED_POT, INPUT);

    button1LastState = digitalRead(BUTTON1_PIN);
    button2LastState = digitalRead(BUTTON2_PIN);
    power1LastState = digitalRead(POWER1_PIN);
    power2LastState = digitalRead(POWER2_PIN);
  
  // Initial game state
  resetGame();
}

void loop() {
  if (!gameActive) {
    playStartSequence();
  }
  
  if (gameActive) {
    // Update LED brightness based on potentiometer
    updateColors();
    
    // Update game speed based on potentiometer
    updateGameSpeed();
    
    // Check for power moves
    checkPowerMoves();
    
    // Check for button presses with debounce
    checkButtons();
    updateLEDs();
  }
}

void checkPowerMoves() {
    // Read current power button states
    bool power1CurrentState = digitalRead(POWER1_PIN);
    bool power2CurrentState = digitalRead(POWER2_PIN);
    
    // Check Player 1 power move button
    if (power1CurrentState == LOW && power1LastState == HIGH) {  // Detect only falling edge
        if (millis() - lastPower1Press > DEBOUNCE_TIME && player1PowerAvailable) {
            activatePowerMove(1);
            lastPower1Press = millis();
        }
    }
    
    // Check Player 2 power move button
    if (power2CurrentState == LOW && power2LastState == HIGH) {  // Detect only falling edge
        if (millis() - lastPower2Press > DEBOUNCE_TIME && player2PowerAvailable) {
            activatePowerMove(2);
            lastPower2Press = millis();
        }
    }

        // Update power button states
    power1LastState = power1CurrentState;
    power2LastState = power2CurrentState;
}

void activatePowerMove(int player) {
    if (player == 1 && player1PowerAvailable) {
        player1PowerActive = true;
        player1PowerMovesLeft = POWER_MOVES_COUNT;
        player1PowerAvailable = false;
        flashPowerMove(1);
    } else if (player == 2 && player2PowerAvailable) {
        player2PowerActive = true;
        player2PowerMovesLeft = POWER_MOVES_COUNT;
        player2PowerAvailable = false;
        flashPowerMove(2);
    }
}

void flashPowerMove(int player) {
    strip.clear();
    // Flash player's side
    if (player == 1) {
        for (int i = 0; i < CENTER_POS; i++) {
            strip.setPixelColor(i, COLOR_MAGENTA);
        }
        tone(BUZZER_PIN, 2000, 200); // Power move activation sound
    } else {
        for (int i = CENTER_POS; i < NUM_LEDS; i++) {
            strip.setPixelColor(i, COLOR_MAGENTA);
        }
        tone(BUZZER_PIN, 2500, 200); // Power move activation sound
    }
    strip.show();
    delay(POWER_FLASH_DURATION);
    updateLEDs();
}

void playStartSequence() {
  // First update colors for the sequence
  updateColors();
  
  // Flash center position in preparation
  for (int i = 0; i < 3; i++) {
    // First two beeps with one frequency
    if (i < 2) {
      strip.clear();
      strip.setPixelColor(CENTER_POS, COLOR_RED);
      strip.setPixelColor(CENTER_POS - 1, COLOR_RED);
      strip.show();
      tone(BUZZER_PIN, 800, 200);  // Lower frequency for ready beeps
      delay(300);
      
      strip.clear();
      strip.show();
      delay(300);
    }
    // Final beep with different frequency
    else {
      strip.clear();
      strip.setPixelColor(CENTER_POS, COLOR_MAGENTA);
      strip.setPixelColor(CENTER_POS - 1, COLOR_MAGENTA);
      strip.show();
      tone(BUZZER_PIN, 1200, 400);  // Higher frequency for start beep
      delay(400);
    }
  }
  
  // Start the game
  gameActive = true;
  flagPosition = CENTER_POS;
  updateLEDs();
}

void updateColors() {
  // Read LED intensity from potentiometer (0-255)
  int intensity = map(analogRead(LED_INTENSITY_POT), 0, 1023, 0, 255);
  
  // Update colors with new intensity
  COLOR_RED = strip.Color(intensity, 0, 0);
  COLOR_BLUE = strip.Color(0, 0, intensity);
  COLOR_YELLOW = strip.Color(intensity, intensity, 0);
  COLOR_MAGENTA = strip.Color(intensity, 0, intensity);
}

void updateGameSpeed() {
  // Read speed value from potentiometer
  clickSpeed = map(analogRead(SPEED_POT), 0, 1023, MIN_CLICK_SPEED, MAX_CLICK_SPEED);
}

void checkButtons() {
    // Read current button states
    bool button1CurrentState = digitalRead(BUTTON1_PIN);
    bool button2CurrentState = digitalRead(BUTTON2_PIN);
    
    // Check Player 1 button (pulls flag left)
    if (button1CurrentState == LOW && button1LastState == HIGH) {  // Detect only falling edge
        if (millis() - lastButton1Press > DEBOUNCE_TIME) {
            // Calculate move amount with a more balanced power multiplier
            int moveAmount = clickSpeed;
            if (player1PowerActive && player1PowerMovesLeft > 0) {
                moveAmount = min(moveAmount + POWER_BOOST, MAX_POWER_SPEED);
                player1PowerMovesLeft--;
                if (player1PowerMovesLeft <= 0) {
                    player1PowerActive = false;
                }
            }
            flagPosition -= moveAmount;
            tone(BUZZER_PIN, player1PowerActive ? 800 : 1000, 20);
            lastButton1Press = millis();
        }
    }
    
    // Check Player 2 button (pulls flag right)
    if (button2CurrentState == LOW && button2LastState == HIGH) {  // Detect only falling edge
        if (millis() - lastButton2Press > DEBOUNCE_TIME) {
            int moveAmount = clickSpeed;
            if (player2PowerActive && player2PowerMovesLeft > 0) {
                moveAmount = min(moveAmount + POWER_BOOST, MAX_POWER_SPEED);
                player2PowerMovesLeft--;
                if (player2PowerMovesLeft <= 0) {
                    player2PowerActive = false;
                }
            }
            flagPosition += moveAmount;
            tone(BUZZER_PIN, player2PowerActive ? 1300 : 1500, 20);
            lastButton2Press = millis();
        }
    }
    
    // Update button states
    button1LastState = button1CurrentState;
    button2LastState = button2CurrentState;
    
    // Keep flag position within bounds
    flagPosition = constrain(flagPosition, 1, NUM_LEDS - 2);
    
    // Check for victory conditions
    if (flagPosition <= 1 || flagPosition >= NUM_LEDS - 2) {
        gameActive = false;
        celebrateVictory();
    }
}

void updateLEDs() {
  strip.clear();
  
  // Draw the red flag (2 LEDs)
  strip.setPixelColor(flagPosition, COLOR_RED);
  strip.setPixelColor(flagPosition - 1, COLOR_RED);
  
  // Draw Player 1 side (blue)
  for (int i = 0; i < flagPosition - 1; i++) {
    strip.setPixelColor(i, i == 0 ? COLOR_MAGENTA : COLOR_BLUE);
  }
  
  // Draw Player 2 side (yellow)
  for (int i = flagPosition + 1; i < NUM_LEDS; i++) {
    strip.setPixelColor(i, i == NUM_LEDS - 1 ? COLOR_MAGENTA : COLOR_YELLOW);
  }
  
  strip.show();
}

void celebrateVictory() {
  // Determine winner's color
  uint32_t winnerColor = (flagPosition <= 1) ? COLOR_BLUE : COLOR_YELLOW;
  
  // Victory tune
  if (flagPosition <= 1) {
    playVictoryTune(1000);  // Lower pitch for Player 1
  } else {
    playVictoryTune(1500);  // Higher pitch for Player 2
  }
  
  // Flash victory animation
  for (int i = 0; i < VICTORY_FLASHES; i++) {
    // Fill with winner's color
    for (int j = 0; j < NUM_LEDS; j++) {
      strip.setPixelColor(j, winnerColor);
    }
    strip.show();
    delay(FLASH_DELAY);
    
    // Turn off
    strip.clear();
    strip.show();
    delay(FLASH_DELAY);
  }
  
  delay(3000);
  resetGame();
}

void playVictoryTune(int baseFreq) {
  tone(BUZZER_PIN, baseFreq, 200);
  delay(200);
  tone(BUZZER_PIN, baseFreq * 1.25, 200);
  delay(200);
  tone(BUZZER_PIN, baseFreq * 1.5, 400);
  delay(400);
}

void resetGame() {
    flagPosition = CENTER_POS;
    gameActive = false;
    player1PowerActive = false;
    player2PowerActive = false;
    player1PowerMovesLeft = 0;
    player2PowerMovesLeft = 0;
    player1PowerAvailable = true;
    player2PowerAvailable = true;
    updateLEDs();
}

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