millerman4487
Published © CC BY-NC-SA

Etch A Sketch Joystick

Use a joystick to control a classic drawing toy through two DC motors.

IntermediateFull instructions provided1 hour2,910

Things used in this project

Hardware components

Arduino UNO & Genuino UNO
Arduino UNO & Genuino UNO
×1
DC motor (generic)
×1
Analog joystick (Generic)
×1

Software apps and online services

Arduino IDE
Arduino IDE

Hand tools and fabrication machines

3D Printer (generic)
3D Printer (generic)
Hot glue gun (generic)
Hot glue gun (generic)

Story

Read more

Custom parts and enclosures

Knob Adapters

Schematics

Schematic

Etch a sketch bb 2pqayhjqvo

Code

Code

Arduino
#include <Wire.h>
#if (ARDUINO >= 100)
#include <Arduino.h>
#else
#include <WProgram.h>
//#define Wire.write(x) Wire.send(x)
//#define Wire.read() Wire.receive()
#endif
static uint8_t nunchuck_buf[6];   // array to store nunchuck data,
// Uses port C (analog in) pins as power & ground for Nunchuck
static void nunchuck_setpowerpins() {
#define pwrpin PORTC3
#define gndpin PORTC2
  DDRC |= _BV(pwrpin) | _BV(gndpin);
  PORTC &= ~ _BV(gndpin);
  PORTC |=  _BV(pwrpin);
  delay(100);  // wait for things to stabilize
}
// initialize the I2C system, join the I2C bus,
// and tell the nunchuck we're talking to it
static void nunchuck_init() {
  Wire.begin();                // join i2c bus as master
  Wire.beginTransmission(0x52);// transmit to device 0x52
#if (ARDUINO >= 100)
  Wire.write((uint8_t)0x40);// sends memory address
  Wire.write((uint8_t)0x00);// sends sent a zero.
#else
  Wire.send((uint8_t)0x40);// sends memory address
  Wire.send((uint8_t)0x00);// sends sent a zero.
#endif
  Wire.endTransmission();// stop transmitting
}
// Send a request for data to the nunchuck
// was "send_zero()"
static void nunchuck_send_request() {
  Wire.beginTransmission(0x52);// transmit to device 0x52
#if (ARDUINO >= 100)
  Wire.write((uint8_t)0x00);// sends one byte
#else
  Wire.send((uint8_t)0x00);// sends one byte
#endif
  Wire.endTransmission();// stop transmitting
}
// Encode data to format that most wiimote drivers except
// only needed if you use one of the regular wiimote drivers
static char nunchuk_decode_byte (char x) {
  x = (x ^ 0x17) + 0x17;
  return x;
}
// Receive data back from the nunchuck,
// returns 1 on successful read. returns 0 on failure
static int nunchuck_get_data() {
  int cnt = 0;
  Wire.requestFrom (0x52, 6);// request data from nunchuck
  while (Wire.available ()) {
    // receive byte as an integer
#if (ARDUINO >= 100)
    nunchuck_buf[cnt] = nunchuk_decode_byte( Wire.read() );
#else
    nunchuck_buf[cnt] = nunchuk_decode_byte( Wire.receive() );
#endif
    cnt++;
  }
  nunchuck_send_request();  // send request for next data payload
  // If we recieved the 6 bytes, then go print them
  if (cnt >= 5) {
    return 1;   // success
  }
  return 0; //failure
}
// Print the input data we have recieved
// accel data is 10 bits long
// so we read 8 bits, then we have to add
// on the last 2 bits.  That is why I
// multiply them by 2 * 2
static void nunchuck_print_data() {
  static int i = 0;
  int joy_x_axis = nunchuck_buf[0];
  int joy_y_axis = nunchuck_buf[1];
  int accel_x_axis = nunchuck_buf[2]; // * 2 * 2;
  int accel_y_axis = nunchuck_buf[3]; // * 2 * 2;
  int accel_z_axis = nunchuck_buf[4]; // * 2 * 2;
  int z_button = 0;
  int c_button = 0;
  // byte nunchuck_buf[5] contains bits for z and c buttons
  // it also contains the least significant bits for the accelerometer data
  // so we have to check each bit of byte outbuf[5]
  if ((nunchuck_buf[5] >> 0) & 1)
    z_button = 1;
  if ((nunchuck_buf[5] >> 1) & 1)
    c_button = 1;
  if ((nunchuck_buf[5] >> 2) & 1)
    accel_x_axis += 1;
  if ((nunchuck_buf[5] >> 3) & 1)
    accel_x_axis += 2;
  if ((nunchuck_buf[5] >> 4) & 1)
    accel_y_axis += 1;
  if ((nunchuck_buf[5] >> 5) & 1)
    accel_y_axis += 2;
  if ((nunchuck_buf[5] >> 6) & 1)
    accel_z_axis += 1;
  if ((nunchuck_buf[5] >> 7) & 1)
    accel_z_axis += 2;
  Serial.print(i, DEC);
  Serial.print("\t");
  Serial.print("joy:");
  Serial.print(joy_x_axis, DEC);
  Serial.print(",");
  Serial.print(joy_y_axis, DEC);
  Serial.print("  \t");
  Serial.print("acc:");
  Serial.print(accel_x_axis, DEC);
  Serial.print(",");
  Serial.print(accel_y_axis, DEC);
  Serial.print(",");
  Serial.print(accel_z_axis, DEC);
  Serial.print("\t");
  Serial.print("but:");
  Serial.print(z_button, DEC);
  Serial.print(",");
  Serial.print(c_button, DEC);
  Serial.print("\r\n");  // newline
  i++;
}
// returns zbutton state: 1=pressed, 0=notpressed
static int nunchuck_zbutton() {
  return ((nunchuck_buf[5] >> 0) & 1) ? 0 : 1;  // voodoo
}
// returns zbutton state: 1=pressed, 0=notpressed
static int nunchuck_cbutton() {
  return ((nunchuck_buf[5] >> 1) & 1) ? 0 : 1;  // voodoo
}
// returns value of x-axis joystick
static int nunchuck_joyx() {
  return nunchuck_buf[0];
}
// returns value of y-axis joystick
static int nunchuck_joyy() {
  return nunchuck_buf[1];
}
// returns value of x-axis accelerometer
static int nunchuck_accelx() {
  return nunchuck_buf[2];   // FIXME: this leaves out 2-bits of the data
}
// returns value of y-axis accelerometer
static int nunchuck_accely() {
  return nunchuck_buf[3];   // FIXME: this leaves out 2-bits of the data
}
// returns value of z-axis accelerometer
static int nunchuck_accelz() {
  return nunchuck_buf[4];   // FIXME: this leaves out 2-bits of the data
}
int loop_cnt = 0;
byte joyx, joyy, zbut, cbut, accx, accy, accz;
void _print() {
  Serial.print("\tX Joy:  ");
  Serial.print(map(joyx, 15, 221, 0, 255));
  Serial.print("\tY Joy:  ");
  Serial.println(map(joyy, 29, 229, 0, 255));
}
int joyx1 = 129;     //  15 - 221
int joyy1 = 124;     //  29 - 229
void setup() {
  Serial.begin(9600);
  nunchuck_setpowerpins();
  nunchuck_init(); // send the initilization handshake
  Serial.println("Wii Nunchuck Ready");
  pinMode(3, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(9, OUTPUT);
  //type();
}
void loop() {
  if ( loop_cnt > 10 ) { // every 100 msecs get new data
    loop_cnt = 0;
    nunchuck_get_data();
    zbut = nunchuck_zbutton();
    joyx = nunchuck_joyx();     //  15 - 221
    joyy = nunchuck_joyy();     //  29 - 229
    _print();
  }
  loop_cnt++;


  if (zbut == 1) {
    type();
    zbut = 0;
  }
  else {
    if (joyx > (joyx1 + 20)) {
      int speed1 = map(joyx - joyx1, 0, 80, 40, 255);
      speed1 = constrain(speed1, 0, 255);
      analogWrite(6, 0);
      analogWrite(9, speed1);
    }
    else if (joyx < (joyx1 - 20)) {
      int speed2 = map(joyx1 - joyx, 0, 90, 40, 255);
      speed2 = constrain(speed2, 0, 255);
      analogWrite(6, speed2);
      analogWrite(9, 0);
    }
    else {
      analogWrite(6, 0);
      analogWrite(9, 0);
    }

    if (joyy > (joyy1 + 20)) {
      int speed3 = map(joyy - joyy1, 0, 80, 40, 255);
      speed3 = constrain(speed3, 0, 255);
      analogWrite(3, 0);
      analogWrite(5, speed3);
    }
    else if (joyy < (joyy1 - 20)) {
      int speed4 = map(joyy1 - joyy, 0, 90, 40, 255);
      speed4 = constrain(speed4, 0, 255);
      analogWrite(3, speed4);
      analogWrite(5, 0);
    }
    else {
      analogWrite(3, 0);
      analogWrite(5, 0);
    }
  }
  delay(1);
}

void type() {
  int rltime = 200;
  //digitalWrite(6, 1);//origin
  //digitalWrite(9, 0);
  //digitalWrite(3, 1);
  //digitalWrite(5, 0);
  //delay(1000);
  //H==============

  //digitalWrite(3, 0);//wait
  //digitalWrite(5, 0);
  //digitalWrite(6, 0);
  //digitalWrite(9, 0);
  //delay(250);


  //digitalWrite(3, 0);//up
  digitalWrite(5, 1);
  delay(500);

  digitalWrite(3, 0);//wait
  digitalWrite(5, 0);
  digitalWrite(6, 0);
  digitalWrite(9, 0);
  delay(250);

  digitalWrite(3, 1);//down
  //digitalWrite(5, 0);
  delay(250);

  digitalWrite(3, 0);//wait
  digitalWrite(5, 0);
  digitalWrite(6, 0);
  digitalWrite(9, 0);
  delay(250);

  //digitalWrite(6, 0);//right
  digitalWrite(9, 1);
  delay(rltime);

  digitalWrite(3, 0);//wait
  digitalWrite(5, 0);
  digitalWrite(6, 0);
  digitalWrite(9, 0);
  delay(250);


  //digitalWrite(3, 0);//up
  digitalWrite(5, 1);
  delay(250);

  digitalWrite(3, 0);//wait
  digitalWrite(5, 0);
  digitalWrite(6, 0);
  digitalWrite(9, 0);
  delay(250);


  digitalWrite(3, 1);//down
  //digitalWrite(5, 0);
  delay(500);

  digitalWrite(3, 0);//wait
  digitalWrite(5, 0);
  digitalWrite(6, 0);
  digitalWrite(9, 0);
  delay(250);


  //digitalWrite(6, 0);//right
  digitalWrite(9, 1);
  delay(rltime);






  //I========================

  digitalWrite(3, 0);//wait
  digitalWrite(5, 0);
  digitalWrite(6, 0);
  digitalWrite(9, 0);
  delay(250);


  digitalWrite(3, 0);//up
  digitalWrite(5, 1);
  delay(500);

  digitalWrite(3, 0);//wait
  digitalWrite(5, 0);
  digitalWrite(6, 0);
  digitalWrite(9, 0);
  delay(250);


  digitalWrite(6, 0);//right
  digitalWrite(9, 1);
  delay(100);

  digitalWrite(3, 0);//wait
  digitalWrite(5, 0);
  digitalWrite(6, 0);
  digitalWrite(9, 0);
  delay(250);


  digitalWrite(6, 1);//left
  digitalWrite(9, 0);
  delay(rltime);

  digitalWrite(3, 0);//wait
  digitalWrite(5, 0);
  digitalWrite(6, 0);
  digitalWrite(9, 0);
  delay(250);

  digitalWrite(6, 0);//right
  digitalWrite(9, 1);
  delay(100);

  digitalWrite(3, 0);//wait
  digitalWrite(5, 0);
  digitalWrite(6, 0);
  digitalWrite(9, 0);
  delay(250);

  digitalWrite(3, 1);//down
  digitalWrite(5, 0);
  delay(500);

  digitalWrite(3, 0);//wait
  digitalWrite(5, 0);
  digitalWrite(6, 0);
  digitalWrite(9, 0);
  delay(250);


  digitalWrite(6, 0);//right
  digitalWrite(9, 1);
  delay(100);

  digitalWrite(3, 0);//wait
  digitalWrite(5, 0);
  digitalWrite(6, 0);
  digitalWrite(9, 0);
  delay(250);


  digitalWrite(6, 1);//left
  digitalWrite(9, 0);
  delay(rltime);

  digitalWrite(3, 0);//wait
  digitalWrite(5, 0);
  digitalWrite(6, 0);
  digitalWrite(9, 0);
  delay(250);


}

Credits

millerman4487

millerman4487

9 projects • 48 followers
Thanks to Tod Kurt.

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