SunFounder 3in1 Kit
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().
4.6. 6. Funny Project 201
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