Thomas Angielsky
Published © GPL3+

Shaking Arduino Dice

One year ago I built a simple Arduino dice with my son. We have learned a lot in the meantime and it's time for an update...

BeginnerFull instructions provided4 hours36,773

Things used in this project

Hardware components

Arduino Nano R3
Arduino Nano R3
×1
3mm 8x8 Dot Matrix MAX7219
×1
Tilt switch module and a digital interface
×1
Slide Switch
Slide Switch
×1
MT3608 DC 2A Step Up Power Module 2v-24v to 5v/9v/12v/28V Boost Converter
×1

Software apps and online services

Arduino IDE
Arduino IDE
Fusion 360
Autodesk Fusion 360

Hand tools and fabrication machines

Soldering iron (generic)
Soldering iron (generic)
Hot glue gun (generic)
Hot glue gun (generic)

Story

Read more

Custom parts and enclosures

Upper part of the casing

Lower part of the casing

Schematics

Circuit

This my sketch for the circuit.

Code

wuerfel8x8.ino

Arduino
Code for the shaking dice
/*
Blog-Artikel: Schttel-Wrfel mit LED Matrix und Bewegungssimulation

https://techpluscode.de/schuettel-wuerfel-mit-led-matrix-und-bewegungssimulation/

techpluscode.de
Copyright 2019 von Thomas Angielsky
*/

//Bibliothek fr die Ansteuerung der 8x8 LED-Matrix einbinden
//Include lib for the 8x8 LED matrix
#include "LedControl.h"


int PinTiltX = 2; //Pin fr Tiltsensor X
int PinTiltY = 3; //Pin fr Tiltsensor Y

//Pins der LED-Matrix
//Pins of the LED matrix
int PinCLK = 7;  
int PinCS = 6;
int PinDIN = 5;

LedControl lc = LedControl(PinDIN, PinCLK, PinCS, 1);

//Koordinaten der Wrfelaugen in der LED-Matrix
//Coordinates of the Dice points in the LED matrix
int DicePic[8][6][2] =
{
  { //leere Matrix und Startposition:
    {9,9}, //1. Punkt
    {9,8}, //2. Punkt
    {9,7}, //3. Punkt
    {9,6}, //4. Punkt
    {9,5}, //5. Punkt
    {9,4} //6. Punkt
  },
  { //1:
    {4,4}, //1. Punkt
    {-1,-1}, //2. Punkt
    {-1,-1}, //3. Punkt
    {-1,-1}, //4. Punkt
    {-1,-1}, //5. Punkt
    {-1,-1}  //6. Punkt
  },
  { //2:
    {2,2}, //1. Punkt
    {6,6}, //2. Punkt
    {-1,-1}, //3. Punkt
    {-1,-1}, //4. Punkt
    {-1,-1}, //5. Punkt
    {-1,-1}  //6. Punkt
  },
  { //3:
    {2,6}, //1. Punkt
    {6,2}, //2. Punkt
    {4,4}, //3. Punkt
    {-1,-1}, //4. Punkt
    {-1,-1}, //5. Punkt
    {-1,-1}  //6. Punkt
  },
  { //4:
    {2,2}, //1. Punkt
    {2,6}, //2. Punkt
    {6,2}, //3. Punkt
    {6,6}, //4. Punkt
    {-1,-1}, //5. Punkt
    {-1,-1}  //6. Punkt
  },
  { //5:
    {2,2}, //1. Punkt
    {2,6}, //2. Punkt
    {6,2}, //3. Punkt
    {6,6}, //4. Punkt
    {4,4}, //5. Punkt
    {-1,-1}  //6. Punkt
  },
  { //6:
    {2,1}, //1. Punkt
    {2,4}, //2. Punkt
    {2,7}, //3. Punkt
    {6,1}, //4. Punkt
    {6,4}, //5. Punkt
    {6,7}  //6. Punkt
  },
  { //Start:
    {-1,-1}, //1. Punkt
    {-1,-1}, //2. Punkt
    {-1,-1}, //3. Punkt
    {-1,-1}, //4. Punkt
    {-1,-1}, //5. Punkt
    {-1,-1}  //6. Punkt
  }
  };


//Variablen der Wrfelaugen: Position, Richtung, Geschwindigkeit fr X und Y
//Variables of the dice: position, direction, speed for X and Y
float DiceXpos[6];
float DiceXdir[6];
volatile byte DiceXspeed[6];
float DiceYpos[6];
float DiceYdir[6];
volatile byte DiceYspeed[6];


int DiceValue;
unsigned long timestamp;
byte Mode;
int volatile shakes;
int ShakesPerSecond;
int step;

void InterruptChecks() {
  //Schttel-Anzahl zhlen
  //Count Shakes
  shakes=shakes+1;
  //Serial.println(millis());
  timestamp=millis();
}

void SetSpeedX() {
  if (Mode==0) {
    //alle Wrfel in X beschleunigen
    //Speed-up dice in X
    for (int i = 0; i < 6; i++) {
      if (DiceXspeed[i]<255) {DiceXspeed[i]=DiceXspeed[i]+5;}
    }
  }  
  InterruptChecks();
}

void SetSpeedY() {
  if (Mode==0) {
    //alle Wrfel in Y beschleunigen
    //Speed-up dice in Y
    for (int i = 0; i < 6; i++) {
      if (DiceYspeed[i]<255) {DiceYspeed[i]=DiceYspeed[i]+5;}
    }
  }
  InterruptChecks();
}

void ShowLed(int x, int y, bool onoff) {
//LED nur anzeigen, wenn im sichtbaren Bereich
//show only, when x/y in matrix
  if ((x<8) and (y<8) and (x>=0) and (y>=0)) {
    lc.setLed(0, x, y, onoff);
  }
}

void ShowDot(int x, int y, bool onoff) {
//Wrfel-Auge anzeigen oder ausblenden
//Show or hide dice point
  ShowLed(x-1, y-1, onoff);
  ShowLed(x, y-1, onoff);
  ShowLed(x-1, y, onoff);
  ShowLed(x, y, onoff);
}

void ShowDicePic(int value) {
//Wurf anzeigen
//Show dice

boolean done;

  //alle Punkte von der aktuellen Position aus zur Zielposition von DiceValue bewegen
  //move all points from current position to destination of DiceValue
  for (int i = 0; i < 6; i++) {
    DiceXspeed[i]=100;
    DiceYspeed[i]=100;

    //Werte fr X berechnen
    //Calc x values
    DiceXdir[i]=0;
    if (int(DiceXpos[i])>DicePic[value][i][0]) {DiceXdir[i]=-1;} 
    else if (int(DiceXpos[i])<DicePic[value][i][0]) {DiceXdir[i]=1;} 
    
    DiceYdir[i]=0;
    if (int(DiceYpos[i])>DicePic[value][i][1]) {DiceYdir[i]=-1;} 
    else if (int(DiceYpos[i])<DicePic[value][i][1]) {DiceYdir[i]=1;} 
  }

  //Serial.println(value);
  //Serial.println("Bewegung Start // Start moving");
  //Punkte bewegen
  do {
    //Serial.println("Bewegung // Moving");
    for (int i = 0; i < 6; i++) {
      if (int(DiceXpos[i])!=DicePic[value][i][0]) {
        DoStep(DiceXpos[i],DiceXdir[i],DiceXspeed[i],false);
      }
      if (int(DiceYpos[i])!=DicePic[value][i][1]) {
        DoStep(DiceYpos[i],DiceYdir[i],DiceYspeed[i],false);
      }
    }

    lc.clearDisplay(0);
    for (int i = 0; i < 6; i++) {
      ShowDot(int(DiceXpos[i]), int(DiceYpos[i]), true);
    }
    
    delay(50);

    //Sind alle Augen an ihrer Zielposition
    //Dice points are on destition position
    done=true;
    for (int i = 0; i < 6; i++) {
      if (int(DiceXpos[i])!=DicePic[value][i][0]) {done=false;}
      if (int(DiceYpos[i])!=DicePic[value][i][1]) {done=false;}
    }

  } while (done==false);
  //Serial.println("Bewegung Ende // End moving");

  lc.clearDisplay(0);
  for (int i = 0; i < 6; i++) {
    ShowDot(DicePic[value][i][0],DicePic[value][i][1], true);
  }
}


void DoStep(float &pos, float &dir, volatile byte &sp, bool check) {
  pos=pos+float(sp)/255*dir;

  if (check==true) {
    if (pos>7) {
        pos=7;
        dir=dir*(-1);
        }
    if (pos<1) {
        pos=1;
        dir=dir*(-1);
      }

  }
  // Geschwindigkeit wird pro Schritt langsamer
  // Velocity decreases every step
    if (sp>0) {sp=sp-1;}
}

void MoveDots() {
  //alle Wrfel einen Schritt weiter bewegen
  //move dice points one step further
  for (int i = 0; i < 6; i++) {
    //neue Koordinaten berechnen
    //calc new coordinates
    DoStep(DiceXpos[i],DiceXdir[i],DiceXspeed[i],true);
    DoStep(DiceYpos[i],DiceYdir[i],DiceYspeed[i],true);
  }

    //Wrfel-Augen anzeigen
    //show dice points
    lc.clearDisplay(0);
    for (int i = 0; i < 6; i++) {
      ShowDot(int(DiceXpos[i]), int(DiceYpos[i]), true);
    }
  
}



void setup() {
  //Der MAX7219 ist beim Starten im Power-Saving Modus,
  //er muss aufgeweckt werden.
  //The MAX7219 is in power-saving mode on startup,
  //we have to do a wakeup call
  lc.shutdown(0, false);
  //Helligkeit auf einen Mittelwert
  //Set the brightness to a medium values 
  lc.setIntensity(0, 8);
  //und Display lschen
  //and clear the display 
  lc.clearDisplay(0);

  randomSeed(analogRead(0));
  DiceValue=0;
  
  for (int i = 0; i < 6; i++) {
    DiceXpos[i]=DicePic[7][i][0];
    DiceYpos[i]=DicePic[7][i][1];
    
    DiceXdir[i]=random(3)-1;
    DiceYdir[i]=random(3)-1;
    DiceXspeed[i]=random(126)+120;
    DiceYspeed[i]=random(126)+120;
    }

  //Pins einstellen
  //Setup the pins
  pinMode(PinTiltX, INPUT_PULLUP);
  pinMode(PinTiltY, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(PinTiltX),SetSpeedX,CHANGE);
  attachInterrupt(digitalPinToInterrupt(PinTiltY),SetSpeedY,CHANGE);
  
  lc.clearDisplay(0);

  timestamp=millis();
  Mode=1;

  ShowDicePic(6);
  delay(1000);
  
  lc.clearDisplay(0);
  Mode=0;
  Serial.begin(9600);
  step=0;
  shakes=0;
}

void loop() {
  delay(50);
  step=step+1;
  if (step>20) {
    //1 sek ist vorbei
    //1 sec is over
    step=0;
    ShakesPerSecond=shakes;
    shakes=0;
  }

  if (Mode==0) {
    MoveDots();
    if (millis()-timestamp>2000) {
      //seit 2 sek kein Schtteln mehr
      //there is no shaking since 2 sec
      Mode=1;
      DiceValue=random(6)+1;
      ShowDicePic(DiceValue);
    }
  }

  if (ShakesPerSecond>5) {
    //Es wird wieder geschttelt
    //shaking again
    Mode=0;
  }

}

Credits

Thomas Angielsky

Thomas Angielsky

18 projects • 36 followers
Mechanical engineer, maker, love woodwork, like Lazarus

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