code, circuits, & construction

Rosie Daniel wrote a nice piece of Arduino code to control an iPod. Rosie used a hacked iPod remote to connect her Arduino to the iPod. The remote’s AUD connection is its data in connection, which is connected to the Arduino/Wiring board’s data out. The iPod’s power (VCC) and Ground are connected to the power and ground of the microcontroller. Then this code works.

Thanks to Rosie for writing this:

Technorati Tags: arduino, atmel, serial

//code that controls basic (play/pause, next, previous, volume up, and volume down) functions of ipod
//rosie daniel

int hits = 0; 

int buttonStates[]={0,0,LOW,LOW,LOW,LOW,LOW};
int buttonPrevious[]={0,0,LOW,LOW,LOW,LOW,LOW};
int buttonRelease[] = {0xFF, 0x55, 0x03, 0x02, 0x00, 0x00,0xFB};

int commands[]={0,0,0x01,0x08,0x10,0x02,0x04}; 

int checkSum(int len, int mode, int command1, int command2, int parameter) {
  int checksum = 0x100 - ((len + mode + command1 + command2+ parameter) & 0xFF);
  return checksum;
}

void setup() {
  Serial.begin(19200);
  pinMode(2, INPUT);
  pinMode(3, INPUT);
  pinMode(4, INPUT);
  pinMode(5, INPUT);
  pinMode(6, INPUT);
}

void loop() {

  for (int c=2; c<7; c++)
  {
     buttonStates[c] = digitalRead(c);

  buttonStates[c] = digitalRead(c);

  if (buttonStates[c] != buttonPrevious[c] ) {
    delay(5); //helps avoid a 'double' press - check a second time to see if the button is still pressed after a delay
     buttonStates[c] = digitalRead(c);
    if (buttonStates[c] == HIGH) {
      sendCommand(commands[c]);
      //Serial.print(hits);
      hits++;
    }
    buttonPrevious[c] = buttonStates[c];
  } 

}

}

void sendCommand(int cmd) {
  int cs = checkSum(0x03, 0x02, 0x00, cmd, 0);
   Serial.println(cs,HEX);

  int bytes[] = {0xFF, 0x55,  0x03, 0x02, 0x00, cmd, cs};
  for (int i = 0; i < 8; i++) {
    Serial.print(bytes[i], BYTE);

  }

  for (int i = 0; i < 8; i++) {
     Serial.print(buttonRelease[i],BYTE);
    }
}