User:Fabien Labeyrie/Bit Shifting

Bit Shifting : learning how to count like a machine

The idea is to work with inputs and outputs of Arduino to make a Simon says kind of game.

How does it work ?

Technologies involved

Arduino

Steps

1. We need a board with a push button and a speaker.
2. The code uses two while loops, constantly checking if the button is pressed, for how long, and launching a timeout during the waiting loop, in order to play the sequence after 5 seconds of wait.

Source code

const int buttonPin = 7;

int buttonState = 0;
int value1;
int value2;
int interval;
int pattern[100];
int i = 0;
int j = 0;
int wfp_start;

void setup() {
  // 9600 is the frequency that will be used by the monitor
  Serial.begin(9600);
  pinMode(buttonPin, INPUT); 
}

void loop(){
 
  while (1) {
    
    // State : WAIT FOR PRESS
    wfp_start = millis();

    while (digitalRead(buttonPin) == LOW && (millis() - wfp_start < 5000 )) {
      // Do nothing the button isn't pressed
    }

    // Act as a timeout. Above 5 sec, we exit the WAIT loop and PLAY
    if ((millis() - wfp_start >= 5000 )) break;
    
    // State : WAIT FOR RELEASE
    value1 = millis();
    
    while (digitalRead(buttonPin) == HIGH) {
      // Play tone when the button is pressed
      tone(8, 100, 5);    
    }

    value2 = millis();
    interval = value2 - value1;  
    pattern[i]= interval;
    Serial.println(pattern[i]);
    
    // This will be used to simplify the values stored in the array    
    if (pattern[i] < 100) pattern[i] = 100;
    else if (pattern[i] > 99 && pattern [i] < 200) pattern[i] = 200;
    else if (pattern[i] > 199 && pattern [i] < 300) pattern[i] = 300;
    else pattern[i] = 400;

    Serial.println(" pattern : ");
    Serial.println(pattern[i]);  
    i++;
    
  }

    // State : PLAY
    while (j < i) {
      tone(8, 100, pattern[j]);
      Serial.println("Pattern plays");    
      j++;  
    }  
}