Oggi vi spiego come realizzare la vostra Decision Box con arduino pro mini.
Per chi non lo sapesse, una Decision Box è semplicemente una scatola magica che vi aiuta a prendere la decisione giusta alle vostre domande.
Come si può intuire non c’è niente di magico in questa decision box, vuole essere solo un passatempo, quindi non pensate di affidarvi a lei per risolvere i vostri problemi 😛

Partiamo subito con il necessario per realizzarla:

1x Arduino Pro Mini 5V
1x Interruttore a levetta (utilizzato per accendere la decision box)
1x Pulsante momentaneo (utilizzato per conoscere la risposta)
1x StripLed WS2801 (bastano pochi led, per maggiori info leggete qui)
2x Contenitore per batterie CR2032
Libreria Neopixel (https://github.com/adafruit/Adafruit_NeoPixel)
Libreria SimpleTimer (https://github.com/schinken/SimpleTimer)

Circuito elettrico

Sketch Arduino

Ora che abbiamo assemblato il circuito possiamo caricare il codice sull’Arduino pro mini.

#include <SimpleTimer.h>
#include <Adafruit_NeoPixel.h>

#define PIXEL_PIN 2        // pin IO used for pilot the Neopixel led
#define BUTTON_PIN 12      // pin IO used for the button
#define ANALOG_PIN 0       // pin IO used for obtain the number to initialize the pseudo-random sequence
#define PIXEL_COUNT 5      // number Neopixel led present in strip
#define NUMBER_PIXEL_ON 5  // number of pixels to be turned on

// numbers to define the colors of the led strip
#define COLOR_RED 1
#define COLOR_GREEN 2
#define COLOR_YELLOW 3
#define OFF 0

int brightness = 30;            // brightness of the leds (min=0,max=255)
int delayChangeColor = 250;      // delay between one color and another 
int timeElaboration = 3000;      // time to process the answer
int timeReadResponse = 2000;     // response display time
int timeWaitingResponse = 1500;  // waiting time before the answer
long timerId;                    // variable to assign the timer id
int buttonState = 0;             // variable for reading the pushbutton status
int input = 0;                   // variable to store the value read

// create the object strip of type Adafruit_NeoPixel
// Parameter 1 = number of pixels in strip
// Parameter 2 = Arduino pin number (most are valid)
// Parameter 3 = pixel type flags, add together as needed:
//   NEO_KHZ800  800 KHz bitstream (most NeoPixel products w/WS2812 LEDs)
//   NEO_KHZ400  400 KHz (classic 'v1' (not v2) FLORA pixels, WS2811 drivers)
//   NEO_GRB     Pixels are wired for GRB bitstream (most NeoPixel products)
//   NEO_RGB     Pixels are wired for RGB bitstream (v1 FLORA pixels, not v2)
Adafruit_NeoPixel strip = Adafruit_NeoPixel(PIXEL_COUNT, PIXEL_PIN, NEO_GRB + NEO_KHZ400);
// the timer object
SimpleTimer timer;

void setup() {
  pinMode(BUTTON_PIN, INPUT);
  randomSeed(analogRead(ANALOG_PIN));
  // Initialize all pixels to 'off
  strip.begin();
  strip.setBrightness(brightness);
  strip.show();
}

void loop() {
  timer.run();
  // read the state of the pushbutton value:
  buttonState = digitalRead(BUTTON_PIN);
  if (buttonState == HIGH) {
    if(!timer.isEnabled(timerId)){
      // start the repetition of colors (processing)
      timerId = timer.setInterval(delayChangeColor*3,elaboration);
      // set the call to the 'stopElaboration' function after 'timeElaboration' (3 seconds) 
      timer.setTimeout(timeElaboration,stopElaboration);
    }
  }
}

// set the three colors on the led strip in sequence
void elaboration(){
    setColor(COLOR_RED);
    delay(delayChangeColor);
    setColor(COLOR_GREEN);
    delay(delayChangeColor);
    setColor(COLOR_YELLOW);
    delay(delayChangeColor);
}

// stop processing and display of the answer
void stopElaboration(){
  timer.disable(timerId);
  setColor(OFF);
  delay(timeWaitingResponse);
  // read the input pin
  input = analogRead(ANALOG_PIN);
  setResponse(input);
  setColor(OFF);
}

// set the led strip with the response obtained randomly with the value of the digital input
void setResponse(int input){
  setColor(random(1,4));
  delay(timeReadResponse);
}

// set the color to the single led based on the entire value passed
void setColor(int color){
  switch(color){
    case COLOR_RED:
      setColorStrip(255,0,0,NUMBER_PIXEL_ON);
      break;
    case COLOR_GREEN:
      setColorStrip(0,255,0,NUMBER_PIXEL_ON);
      break;
    case COLOR_YELLOW:
      setColorStrip(255,255,0,NUMBER_PIXEL_ON);
      break;
    case OFF:
      setColorStrip(0,0,0,NUMBER_PIXEL_ON);
      break;
  }
}

// set the color chosen for all the LEDs
void setColorStrip(int r, int g, int b, int numberPixel){
  for(int i=0; i<numberPixel; i++){
    strip.setPixelColor(i,strip.Color(r,g,b));
  }
  strip.show();
}

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#include <SimpleTimer.h>

#include <Adafruit_NeoPixel.h>

#define PIXEL_PIN 2 // pin IO used for pilot the Neopixel led

#define BUTTON_PIN 12 // pin IO used for the button

#define ANALOG_PIN 0 // pin IO used for obtain the number to initialize the pseudo-random sequence

#define PIXEL_COUNT 5 // number Neopixel led present in strip

#define NUMBER_PIXEL_ON 5 // number of pixels to be turned on

// numbers to define the colors of the led strip

#define COLOR_RED 1

#define COLOR_GREEN 2

#define COLOR_YELLOW 3

#define OFF 0

int brightness = 30; // brightness of the leds (min=0,max=255)

int delayChangeColor = 250; // delay between one color and another

int timeElaboration = 3000; // time to process the answer

int timeReadResponse = 2000; // response display time

int timeWaitingResponse = 1500; // waiting time before the answer

long timerId; // variable to assign the timer id

int buttonState = 0; // variable for reading the pushbutton status

int input = 0; // variable to store the value read

// create the object strip of type Adafruit_NeoPixel

// Parameter 1 = number of pixels in strip

// Parameter 2 = Arduino pin number (most are valid)

// Parameter 3 = pixel type flags, add together as needed:

// NEO_KHZ800 800 KHz bitstream (most NeoPixel products w/WS2812 LEDs)

// NEO_KHZ400 400 KHz (classic 'v1' (not v2) FLORA pixels, WS2811 drivers)

// NEO_GRB Pixels are wired for GRB bitstream (most NeoPixel products)

// NEO_RGB Pixels are wired for RGB bitstream (v1 FLORA pixels, not v2)

Adafruit_NeoPixel strip = Adafruit_NeoPixel(PIXEL_COUNT, PIXEL_PIN, NEO_GRB + NEO_KHZ400);

// the timer object

SimpleTimer timer;

void setup() {

pinMode(BUTTON_PIN, INPUT);

randomSeed(analogRead(ANALOG_PIN));

// Initialize all pixels to 'off

strip.begin();

strip.setBrightness(brightness);

strip.show();

}

void loop() {

timer.run();

// read the state of the pushbutton value:

buttonState = digitalRead(BUTTON_PIN);

if (buttonState == HIGH) {

if(!timer.isEnabled(timerId)){

// start the repetition of colors (processing)

timerId = timer.setInterval(delayChangeColor*3,elaboration);

// set the call to the 'stopElaboration' function after 'timeElaboration' (3 seconds)

timer.setTimeout(timeElaboration,stopElaboration);

}

// set the three colors on the led strip in sequence

void elaboration(){

setColor(COLOR_RED);

delay(delayChangeColor);

setColor(COLOR_GREEN);

delay(delayChangeColor);

setColor(COLOR_YELLOW);

delay(delayChangeColor);

}

// stop processing and display of the answer

void stopElaboration(){

timer.disable(timerId);

setColor(OFF);

delay(timeWaitingResponse);

// read the input pin

input = analogRead(ANALOG_PIN);

setResponse(input);

setColor(OFF);

}

// set the led strip with the response obtained randomly with the value of the digital input

void setResponse(int input){

setColor(random(1,4));

delay(timeReadResponse);

}

// set the color to the single led based on the entire value passed

void setColor(int color){

switch(color){

case COLOR_RED:

setColorStrip(255,0,0,NUMBER_PIXEL_ON);

break;

case COLOR_GREEN:

setColorStrip(0,255,0,NUMBER_PIXEL_ON);

break;

case COLOR_YELLOW:

setColorStrip(255,255,0,NUMBER_PIXEL_ON);

break;

case OFF:

setColorStrip(0,0,0,NUMBER_PIXEL_ON);

break;

}

// set the color chosen for all the LEDs

void setColorStrip(int r, int g, int b, int numberPixel){

for(int i=0; i<numberPixel; i++){

strip.setPixelColor(i,strip.Color(r,g,b));

}

strip.show();

}

Non mi soffermo sul funzionamento del codice, in quanto è ben commentato, vi spiego a grandi linee come funziona.
Dopo che abbiamo fatto la domanda alla nostra Decision Box e premuto il pulsante, parte la ripetizione della funzione elaboration() che accende i led nei tre colori (rosso=NO, verde=Sì,giallo=FORSE) per 6 secondi. Al termine dell’elaborazione viene chiamata la funzione stopElaboration() che si occupa di spegnere i led per 4 secondi, per aumentare l’attesa, e infine viene visualizzata la risposta in base al colore dei led.
La logica che definisce di che colore accendere i led è data dalla funzione random(1,4) che sceglie un valore intero tra 1 e 3, il tutto avendo settato randomSeed(analogRead(ANALOG_PIN)) in modo da inizializzare una sequenza pseudo-casuale.
Nota: il pin ANALOG_PIN non è collegato a niente

Ora non vi resta che fare le domande alla vostra Decision Box e aspettare la risposta 😉