Project Overview

Connections:

Arduino Code

Copy and Upload the following code to your Arduino:

#include <Wire.h>

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,20,4);  // set the LCD address to 0x27 for a 16 chars and 2 line display

const int vibPin = 2;

const int buzzerPin = 8;

bool ready = true;

void setup() {

 lcd.init();

 lcd.backlight();

 lcd.setCursor(0, 0);

 lcd.print("Shake to Roll!");

 pinMode(vibPin, INPUT);

 pinMode(buzzerPin, OUTPUT);

 randomSeed(analogRead(A0));  // Seed randomness

}

void loop() {

 int vibState = digitalRead(vibPin);

 if (vibState == HIGH && ready) {

 ready = false;

 int diceNumber = random(1, 7);  // Random number between 1 and 6

 lcd.clear();

 lcd.setCursor(0, 0);

 lcd.print("You rolled a:");

 lcd.setCursor(6, 1);

 lcd.print(diceNumber);

 tone(buzzerPin, 1000, 200);  // Beep sound

 delay(1000);  // Delay before allowing next roll

 lcd.clear();

 lcd.setCursor(0, 0);

 lcd.print("Shake to Roll!");

 ready = true;

 }

}

How It Works

Let’s break down the working logic:

1. Shake Detection:
   The vibration sensor has a spring inside. When you shake the breadboard or setup, the spring momentarily closes a circuit, sending a HIGH signal to pin 2.
   
   

2. Random Number Generation:
   Using randomSeed() and random(1, 7), the Arduino generates a pseudo-random number from 1 to 6.
   
   

3. Display Output:
   The result is shown on the 16x2 LCD screen via the I2C interface. This simplifies wiring, needing only 4 wires.
   
   

4. Sound Feedback:
   A quick beep from the buzzer provides audio feedback to enhance the user experience.
   
   

Testing & Troubleshooting

• If LCD is blank, check the I2C address (use an I2C scanner sketch).

• If the vibration sensor is too sensitive, try using a short delay() of 10ms  after the shake to debounce.

• If the buzzer doesn’t beep, confirm it's not connected in reverse.

Final Output

When you shake the setup:

• The LCD displays a message like “You rolled a: 4”
  
  

• The buzzer beeps once
  
  

• Then it resets to “Shake to Roll!” waiting for the next movement

Enhancement Ideas

Want to take your project further?

• Add RGB LEDs to light up with the number rolled.
  
  

• Show a rolling animation (1 to 6) before showing the final number.
  
  

• Use a gyroscope or accelerometer for more refined motion sensing.
  
  

• Add a battery module for portability.

Conclusion

With just a few components and some simple code, you’ve built a fully functional digital dice roller using Arduino! It’s a fun and practical way to explore motion detection, display output, and buzzer interaction—all skills you can carry into more advanced projects.