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6.2 Digital Dice

Here we use button, 7-segment and 74hc595 to make an electronic dice. Each time the button is pressed, a random number ranging from 1 to 6 is generated and displayed on the 7-segment Display.

Required Components

In this project, we need the following components.

It’s definitely convenient to buy a whole kit, here’s the link:

Name	ITEMS IN THIS KIT	LINK
3 in 1 Starter Kit	380+	3 in 1 Starter Kit

You can also buy them separately from the links below.

COMPONENT INTRODUCTION	PURCHASE LINK
Arduino Uno R4 Minima	-
Breadboard	BUY
Jumper Wires	BUY
Resistor	BUY
Button	BUY
74HC595	BUY
7-segment Display	BUY

Schematic

Wiring

Code

Note

• Open the 6.2.electronic_dice.ino file under the path of 3in1-kit\learning_project\6.2.electronic_dice.

• Or copy this code into Arduino IDE.

When the code is uploaded successfully, the 7-segment Display will display 0-7 in a fast scroll, and when you press the button, it will display a random number and stop scrolling. The scrolling display starts again when you press the button again.

How it works?

This project is based on 5.10 ShiftOut(Segment Display) with a button to start/pause the scrolling display on the 7-segment Display.

1. Initialize each pin and read the value of the button.

   void setup ()
   {
   
       ...
       attachInterrupt(digitalPinToInterrupt(buttonPin), rollDice, FALLING);
   }
   

   • The interrupt is used here to read the state of the button. The default value of buttonPin is low, which changes from low to high when the button is pressed.

   • rollDice represents the function to be called when the interrupt is triggered, it is used to toggle the value of the variable state.

   • FALLING means the interrupt is triggered when the buttonPin goes from low to high.

2. When the variable state is 0, the function showNumber() is called to make the 7-segment Display randomly display a number between 1 and 7.

   void loop()
   {
       if (state == 0) {
           showNumber((int)random(1, 7));
           delay(50);
       }
   }
   

3. About rollDice() function.

   void rollDice() {
       state = !state;
   }
   

   When this function is called, it toggles the value of state, such as 1 last time and 0 this time.

4. About showNumber() function.

   void showNumber(int num) {
       digitalWrite(STcp, LOW); //ground ST_CP and hold low for as long as you are transmitting
       shiftOut(DS, SHcp, MSBFIRST, datArray[num]);
       //return the latch pin high to signal chip that it
       //no longer needs to listen for information
       digitalWrite(STcp, HIGH); //pull the ST_CPST_CP to save the data
   }
   

   This is the code inside loop() in the project 5.10 ShiftOut(Segment Display) into the function showNumber().